Updated on 2022/09/16

写真a

 
MORI Yasushi
 
Organization
Faculty of Environmental and Life Science Professor
Position
Professor
External link

Degree

  • (BLANK) ( Kyoto University )

Research Interests

  • 物質循環

  • 土壌水文学

  • 環境計測

  • 土壌環境工学

  • Environmental Conservationn

Research Areas

  • Environmental Science/Agriculture Science / Rural environmental engineering and planning

  • Environmental Science/Agriculture Science / Environmental load reduction and remediation

  • Environmental Science/Agriculture Science / Social-ecological systems

Education

  • 京都大学博士(農学)    

    2000.1

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  • Kyoto University   大学院農学研究科  

    1991.4 - 1993.3

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    Country: Japan

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  • Kyoto University   農学部  

    1987.4 - 1991.3

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    Country: Japan

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Research History

  • Okayama University   Grad School of Environ. & Life Science,   Professor

    2016.4

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  • Okayama University The Graduate School of Environmental and Life Science   Associate Professor

    2012.1 - 2016.3

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  • Shimane University   Research Center for Coastal Lagoon Environments

    2009.4 - 2011.12

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  • 鳥取大学大学院(連合農学研究科)兼任(博士課程主指導資格)

    2006.4 - 2011.12

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  • 島根大学助教授(生物資源科学研究科)

    2003.4 - 2011.12

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  • 鳥取大学大学院(連合農学研究科)兼任(博士課程指導資格)

    2003.4 - 2011.12

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  • カリフォルニア大学デービス校研究員(日本学術振興会海外特別研究員)

    2001.4 - 2003.3

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  • 島根大学助手(生物資源科学部)

    1993.4 - 2003.3

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Professional Memberships

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Committee Memberships

  • 農林水産省中四国農政局   河川環境調査委員会  

    2020.4   

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    Committee type:Municipal

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  • 農業農村工学会   論文集編集委員会  

    2016.6 - 2020.6   

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    Committee type:Academic society

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  • 岡山県   環境検討協議会  

    2016.4   

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    Committee type:Municipal

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  • 日本学術振興会   科学研究費審査委員  

    2014.12 - 2016.2   

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    Committee type:Government

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  • Interfaces Against Pollution   organizing committee  

    2008.6   

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    Committee type:Academic society

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  • 日本地球惑星科学連合   セッションコンビーナ  

    2008.5   

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    Committee type:Academic society

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  • 島根県   公共事業再評価委員会  

    2008.4 - 2011.12   

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    Committee type:Municipal

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  • 土壌物理学会   評議員  

    2007   

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Papers

  • Artificial macropore installation and no-tillage practice in subtropical sugarcane field to conserve water and organic matter in soils. Reviewed

    Oka K, Bui TL, Mori Y, Osawa K, Hoshikawa A

    J. Jpn. Soc. Soil Phys   150   93 - 103   2022.4

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  • Macropore structure and water management affect greenhouse gas emissions in agricultural fields. Paddy and Water Environment.

    Bui, T. L., Mori, Y., Yamamoto, Y., & Maeda, M

    Paddy and Water Environment   2021.7

  • Macropore structure and water management affect greenhouse gas emissions in agricultural fields. Reviewed

    Bui, T. L, Mori, Y, Yamamoto, Y, Maeda, M

    Paddy and Water Environment.   19   661 - 672   2021.7

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  • Pinhole multistep centrifuge outflow method for estimating unsaturated hydraulic properties with small volume soil samples.

    Bui, L. T., & Mori, Y.

    Water 2021   2021.4

  • Pinhole multistep centrifuge outflow method for estimating unsaturated hydraulic properties with small volume soil samples. Reviewed

    Bui, T. L, Mori, Y

    Water (Switzerland)   13 ( 9 )   1169   2021.4

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  • Organic Matter Clogging Results in Undeveloped Hardpan and Soil Mineral Leakage in the Rice Terraces in the Philippine Cordilleras Reviewed

    Tomoyo Kurozumi, Yasushi Mori, Hiroaki Somura, Milagros O-How

    Water (Switzerland)   12 ( 11 )   3158 - 3158   2020.11

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Rice terraces in Cordillera, Philippines, a world cultural heritage site, are threatened by the risk of collapse. It is crucial to manage these rice terraces for their conservation, while simultaneously practicing traditional farming. We examined the soil environment and investigated its effects on rice terrace conservation, by focusing on the hardpan condition; infiltration process, which is related to the collapse of rice terraces; and soil nutrition conditions in these sites. Field survey and soil analysis revealed that in areas where the hardpan was not sufficiently developed and water infiltration was effectively suppressed, organic matter content was significantly high, suggesting organic matter clogging. In these rice terraces, the amounts of P, K, Ca, and Mn were significantly low, showing the mineral leaching under reductive soil conditions. Therefore, hardpan formation, rather than organic matter clogging, is essential for the suppression of infiltration and prevention of potential terrace collapse. Because hardpan formation or organic matter clogging cannot be identified from the surface of flooded rice paddies, it is difficult to identify the influencing factor. Thus, we suggest that the hard soil layer should be checked before the planting season and drainage is allowed after the cropping season in the rainy season.

    DOI: 10.3390/w12113158

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  • EVALUATION OF DRAINAGE PROCESS IN VINEYARD TO OBTAIN BETTER QUALITY OF WINE GRAPE

    Yasushi Mori, Toshiko Miura, Thanh Long Bui

    Application of Advanced Technologies in Agriculture   2020.10

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  • Evaluation of Drainage Process in Vineyard to Obtain Better Quality of Wine Grape Reviewed

    Yasushi Mori, Toshiko Miura, Bui Thanh Long

    Application of Advanced Technologies in Agriculture   6   2020.10

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  • 大阪府における醸造用ブドウ園土壌の理化学性と果実品質との関係

    三浦季子,佐野修司,三輪由佳,谷本秀夫,森也寸志

    日本土壌肥料学雑誌   2020

  • 大阪府における醸造用ブドウ園土壌の理化学性と果実品質との関係 Reviewed

    三浦季子, 佐野修司, 三輪由佳, 谷本秀夫, 森也寸志

    日本土壌肥料学会誌   91 ( 6 )   445 - 450   2020

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  • When do rice terraces become rice terraces? Reviewed

    Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

    Paddy and Water Environment   17   323 - 330   2019.7

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    © 2019, The International Society of Paddy and Water Environment Engineering. Rice terraces located on sloped hills in mountainous areas are sometimes abandoned because of lack of labor and difficulties associated with cultivation. Recently, rice terraces also have been re-evaluated from the perspectives of water conservation or flood control. As a consequence, restoration has been conducted in many locations. In this study, we conducted field research on rice terraces in Okayama in order to determine when rice terraces become stable as rice terraces. Soil samples were obtained from depths of 0, 10, and 30 cm in abandoned fields and rice terraces restored in 2015, 2016, and 2017. The results showed that total carbon was the highest in abandoned fields and gradually decreased in the 2017-restored fields, followed by that in the 2016-restored fields. Particle analysis, particularly of surface soil, showed that the sand fraction decreased in order of abandoned fields, 2017-restored fields, and 2016-restored fields. We established that recently restored rice terraces have similar properties to those located on mountain hills, including few fine particles and high organic matter content in the surface soils. If the surface soil was cultivated and mixed with deeper soils, then the clay and silt content would gradually increase with time. Cone penetrometer analysis revealed that there was no clear evidence of a hard pan in the abandoned field and the 2017-restored field. In contrast, a hard pan had begun to develop in the 2016-restored fields and that it had become well established in the 2015-restored fields. Collectively, our findings indicate that although all rice terraces have a superficially similar appearance, recently recovered fields tend to have properties comparable to the properties of those located on mountain hills. These properties gradually change in the 2–3 years following restoration with the subsequent development of a well-established hard pan. We conclude that even rice terraces that have been abandoned for more than 30 years can develop clear properties of rice terraces within 3 years after restoration.

    DOI: 10.1007/s10333-019-00727-0

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  • Impacts of Hydrological Changes on Nutrient Transport From Diffuse Sources in a Rural River Basin, Western Japan Reviewed

    Jun'ichiro Ide, Ikuo Takeda, Hiroaki Somura, Yasushi Mori, Yuji Sakuno, Yasumichi Yone, Erina Takahashi

    Journal of Geophysical Research: Biogeosciences   124 ( 8 )   2565 - 2581   2019.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union (AGU)  

    ©2019. American Geophysical Union. All Rights Reserved. Increased frequency of heavy rainfall caused by climate change may affect nutrient transport from forests and agricultural lands into downstream rivers. However, little information is available on how the effects of land cover on nutrient concentrations in the downstream rivers change depending on hydrological conditions. To elucidate this, we investigated the effects of changes in precipitation and river discharge on the relationship between river nutrient concentrations (total nitrogen, total phosphorus, nitrate, and phosphate) and land cover in eight subbasins of the Hii River basin, western Japan. We hypothesized that coniferous forests and agricultural lands including poorly managed ones, which require thinning and fertilizer management, respectively, contribute to increases in nutrient concentrations in downstream rivers during storms. Linear mixed-effects model analyses based on 18-year observation data were used for testing the hypothesis. Results revealed that the slopes of the multiple regression analysis between nutrient concentrations and coniferous and broad-leaved forest area ratios were negative and decreased with increasing daily precipitation. This suggests that forests contributed to the dilution of river nutrient concentrations during storms regardless of whether they were coniferous or broad leaved. In contrast, the slope of regression between nutrient concentrations and agricultural area ratio revealed the opposite trend, indicating that even a small percentage of agricultural area makes a large contribution to increases in nutrient concentrations as precipitation increases. Our results imply that storm runoff in response to rainfall results in an elevated supply of nitrogen and phosphorus attached to arable soils to the river.

    DOI: 10.1029/2018JG004513

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  • Wintering Site Environment for the Nagoya Daruma Pond Frog (Pelophylax porosus brevipodus) in Kurashiki, Okayama Prefecture, Western Japan Reviewed

    TADA Masakazu, ITO Kunio, SAITO Minoru, MORI Yasushi, FUKUMASU Jumpei, NAKATA Kazuyoshi

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering   87 ( 2 )   I_179 - I_187   2019

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    Language:Japanese   Publisher:公益社団法人 農業農村工学会  

    <p>We conducted field surveys to clarify distribution of the wintering Nagoya Daruma Pond Frog (<i>Pelophylax porosus brevipodus</i>) and the environmental factors affecting wintering site of this species in a rice paddy field and an adjacent fallow paddy field in Kurashiki, Okayama Prefecture, western Japan, where the species inhabits at a high density. The majority of the wintering individuals (34 out of 35) were found in the fallow paddy field. A GLM was fitted using presence and absence of this species as the objective variable, whereas cover rate, plant height, soil pH, volumetric water content, gravimetric water content, degree of saturation, porosity, and topsoil hardness as the explanatory variables. The best model selected based on AIC consisted of soil hardness, cover rate, and the quadratic term of plant height, in which the negative effect of soil hardness was significant. The results insist on the importance of soil hardness and the presence of plants on the topsoil when creating wintering habitat for this frog species in rice paddy fields.</p>

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  • PARALLEL IMPROVEMENT OF HYDROLOGICAL SIMULATION AND MICROWAVE SATELLITE SOIL MOISTURE OBSERVATION WITH A UNIFIED SOIL WATER MODEL Reviewed

    辻本 久美子, 太田 哲, 森 也寸志

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE   62 ( 4 )   Ⅰ_979 - 984   2018

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  • Artificial macropore enhances restoration of soil environment and vegetation

    森 也寸志

    アグリバイオ = Agricultural biotechnology   1 ( 5 )   599 - 601   2017.5

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  • Physical properties of paddy soils in Iitate Village, Fukushima Prefecture Reviewed

    勝田 洋平, 木村 叡人, 市田 知子, 森 也寸志, 登尾 浩助

    土壌の物理性 = Journal of the Japanese Society of Soil Physics   ( 133 )   29 - 36   2016.7

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  • Spatial variations in river nitrate concentration from upper toward lower reaches in the hilly and mountainous area

    Ide Jun'ichiro, Somura Hiroaki, Nakamura Takashi, Mori Yasushi, Takeda Ikuo, Nishida Kei

    The Japanese Forest Society Congress   127   624 - 624   2016

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    DOI: 10.11519/jfsc.127.0_624

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  • Hydrological Effects on Relationships Between N-15 of River Nitrate and Land Use in a Rural River Basin, Western Japan Reviewed

    J. Ide, H. Somura, T. Nakamura, Y. Mori, I. Takeda, K. Nishida

    RIVER RESEARCH AND APPLICATIONS   31 ( 5 )   639 - 649   2015.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    This study aimed to examine how the relationship between N-15 of nitrate (N-15(NO3)) in rivers and land use within a river basin changes with varying hydrological conditions. This information would aid in identifying the dominant source contributing to increased nitrate concentrations in rural rivers. For this, N-15(NO3) in river water was investigated monthly in the five subbasins of the Hii River basin (area: 911km(2)), western Japan, for 1year and 3months. There were significant correlations (p<0.05) between N-15(NO3) and the land-use ratio (i.e. ratios of forested, agricultural and residential areas in a subbasin) for the majority of the observation days, indicating that N-15(NO3) reflected land use within the basin. N-15(NO3) ranged from +1.4 parts per thousand to +8.5 parts per thousand and was lower in a subbasin with a higher forested area ratio. We found that the absolute value of the regression slope of the relationship between N-15(NO3) and the land-use ratio decreased with increasing river discharge. This finding demonstrates that differences in N-15(NO3) among subbasins with different land-use compositions became smaller under higher flow conditions. Because N-15(NO3) decreased with increasing river discharge, the small absolute value of the regression slope under high flow conditions indicates that forested areas could be the dominant source of river nitrate during high flows in all subbasins investigated regardless of land-use composition. The results suggest that forested areas make a large contribution to the increase in nitrate concentration in downstream rivers during high flows, because the nitrate concentration increased with increasing river discharge. Copyright (c) 2014 John Wiley & Sons, Ltd.

    DOI: 10.1002/rra.2756

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  • Challenges to Establishing Environmental Resource Recycling Society after Texas Water Environment Project

    森 也寸志, 宗村 広昭, ウォルフ ジューン

    水土の知 : 農業農村工学会誌   83 ( 1 )   7 - 10   2015.1

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  • Estimation of nutrient input by a migratory bird, the Tundra Swan (Cygnus columbianus), to winter-flooded paddy fields Reviewed

    Hiroaki Somura, Tsugiyuki Masunaga, Yasushi Mori, Ikuo Takeda, Jun'ichiro Ide, Hirokazu Sato

    AGRICULTURE ECOSYSTEMS & ENVIRONMENT   199 ( 1 )   1 - 9   2015.1

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    Thousands of Tundra Swans visit winter-flooded paddy fields in the study area, Yasugi city, Shimane Prefecture, Japan every year for overwintering from November to March. Since 2004, they have roosted in the paddy fields during the night and foraged in the paddy and surrounding fields during the day, coinciding with the time when farmers began using winter-flooded paddy fields. Before 2004, the swans visited the area for foraging during the day and roosted at nearby lakes, wetlands, and sandbars along rivers during the night. When the swans visited our target paddy fields, the water gradually became green and began to emit an ammonia-like odor. In this study, we investigated the changes in the water qualities of winter-flooded paddy fields and the influence of bird excrement on water quality in the paddy fields during winter, and then estimated the amounts of nitrogen (N) and phosphorus (P) provided by bird droppings to the paddy fields. The mean concentrations of N, P, suspended sediment, and total organic carbon were higher in the overwintering season than during the irrigation season. This trend was observed in both the first and second seasons of the study. The spatial distribution of electric conductivity (EC) measured using a GEM-2 broad-band electromagnetic sensor coincided with that of the matted sites of Tundra Swans in the paddy field, which indicated that the excrement of the swans affected the EC distribution. The total input amounts of N and P from the birds' excrement to the flooded paddy fields were estimated using a simple model that considered bird counts and probable nutrient content of feces, and the amounts were found to be equivalent to approximately 30% of those present in the standard fertilizers used for rice during the irrigation period. These results suggested that the excrement from the swans markedly influences the water qualities of winter-flooded paddy fields. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.agee.2014.07.018

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  • Installing artificial macropores in degraded soils to enhance vertical infiltration and increase soil carbon content Reviewed

    Yasushi Mori, Atsushi Fujihara, Kazuto Yamagishi

    Progress in Earth and Planetary Science   1 ( 1 )   30 - 41   2014.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Berlin Heidelberg  

    Of all terrestrial media (including vegetation and the atmosphere), soil is the largest store of carbon. Soils also have important functions such as water storage and plant support roles. However, at present, these characteristics do not fully function, because of, for example, climate-change-induced heavy rainfall would wash away the organic-rich surface soils. In this study, artificial macropores were introduced into exposed soil plots for the purpose of enhancing infiltration, and fibrous material was inserted to reinforce the macropore structure. As expected, the capillary force caused by the fibers drew surface water deeper into the soil profile before saturation. Additionally, the same capillary force promoted vertical transport, while micropores (matrix) enhanced horizontal flow. Our results show that infiltration was more effective in the fiber-containing macropores than in empty macropores. Additionally, our column experiments showed that artificial macropores reduced surface runoff when the rainfall intensities were 2, 4, and 20 mm · h−1 but not for 80 mm · h−1. In field experiments, soil moisture sensors installed at depths of 10, 30, and 50 cm responded well to rainfall, showing that artificial macropores were able to successfully introduce surface water into the soil profile. One year after the artificial macropores were installed, a field survey carried out to assess soil organic matter and plant growth showed that plant biomass had doubled and that there was a significant increase in soil carbon. This novel technique has many advantages as it mimics natural processes, is low cost, and has a simple structure.

    DOI: 10.1186/s40645-014-0030-5

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  • Controlling solute transport processes in soils by using dual-porosity characteristics of natural soils. Reviewed

    Mori, Y, N. Higashi

    347 ( 1 )   121 - 127   2014.1

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  • Soil aggregate structure and soil processes

    WAGAI Rota, HAYATSU Masahito, AOYAMA Masakazu, HATANO Ryusuke, ITO Kazuhito, ASANO Maki

    Japanese Journal of Soil Science and Plant Nutrition   85 ( 3 )   285 - 290   2014

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    Language:Japanese   Publisher:Japanese Society of Soil Science and Plant Nutrition  

    DOI: 10.20710/dojo.85.3_285

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    Other Link: http://agriknowledge.affrc.go.jp/RN/2010872653

  • Effective vertical solute transport in soils by artificial macropore system Reviewed

    Yasushi Mori, Yuuya Hirai

    Journal of Hazardous, Toxic, and Radioactive Waste   18 ( 2 )   1 - 11   2014

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Society of Civil Engineers (ASCE)  

    Solute transport is an important factor governing soil environmental processes, such as effective fertilizer application or dispersion areas of remediation chemicals for contaminated soils. Macropores are ubiquitous in soils. In unsaturated conditions, they enhance air intrusion into soils, thus reducing the chances of clogging and surface ponding. However, their structure is hard to maintain, and they tend to collapse during long-term infiltration. In this experiment, macropore fillings were introduced into the pores to maintain their structure. Solute transport experiments were conducted for four soils with no macropores, empty macropores, macropores with paper towel fillings, and macropores with glass fiber fillings. The macropores with fillings worked as water pathways that conducted solutions to the deeper profile without saturation at the surface, thus avoiding clogging. When bio-remediation experiments were conducted using these four soil columns, soil columns with glass fiber fillings maintained 0.6-0.8 of the saturated water content, which was found to enhance biological activity. The resultant bio-remediation was best for glass fiber fillings because artificial macropores with fibrous fillings maintained a macropore structure, which gave a stable infiltration rate for 30 days © 2014 American Society of Civil Engineers.

    DOI: 10.1061/(ASCE)HZ.2153-5515.0000192

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  • Studies on evaluation for the effects of conifer plantations on water chemistry in stream and river

    Ide Jun'ichiro, Chiwa Masaaki, Somura Hiroaki, Mori Yasushi, Takeda Ikuo, Sakuno Yuji, Otsuki Kyoichi

    Proceeding of Annual Conference   27   100137 - 100137   2014

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    This study aimed to evaluate the role of conifer plantations under poor management practices in stream and water chemistry. For this, we investigated (1) nitrogen (N) and phosphorus (P) budgets in a forested headwater catchment and (2) effects of coniferous forest land use on N and P concentrations in river water in consideration of temporal variations in stream and river N and P concentrations during storm events. In this conference, I am going to present those results.

    DOI: 10.11520/jshwr.27.0_100137

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  • Evaluation of management practices in forest soil environments using a multi-frequency electromagnetic sounding system Reviewed

    宮本 珠未, 川原 まどか, 森 也寸志, 宗村 広昭, 井手 淳一郎, 高橋 絵里奈, 米 康充, 末継 淳

    土壌の物理性 = Journal of the Japanese Society of Soil Physics   124 ( 124 )   17 - 24   2013.7

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:土壌物理学会  

    農林地は流域面積の中で大きな割合を占め,広大な土壌環境を効果的に調査できればその効果は非常に大きい。本研究では,多周波数電磁探査機を用いて土壌の電気伝導度を測定し,森林の管理が土壌環境に与える影響を調べた。電磁探査の結果を鉛直プロファイルで表示すると,土壌環境の違いは表層近くに特徴的に現れており,間伐が遅れている森林では表層土壌の電気伝導度が高くなる結果が得られた。同サイトでは土壌の透水性が低い傾向があり,有機物も浅部のみに見られることから,浸透性の悪さが表層への物質の集中を促していると推測された。また農地としての履歴のある森林では,表層土壌の電気伝導度が高くなる傾向があり,過去の利用履歴が土壌環境に影響していた。多周波数電磁探査法は非接触で短時間に広範囲の土壌調査が可能であり,詳細調査の前のスクリーニングに役立つと考えられた。

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    Other Link: https://agriknowledge.affrc.go.jp/RN/2010853115

  • 1-1-16 人工マクロポアを利用した下方浸透の促進と有機物貯留による劣化土壌の修復(1-1 物質循環・動態,2013年度名古屋大会) Reviewed

    森 也寸志, 末継 淳, 山本 哲也

    日本土壌肥料学会講演要旨集   59 ( 0 )   6 - 6   2013

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    Language:Japanese   Publisher:一般社団法人 日本土壌肥料学会  

    DOI: 10.20710/dohikouen.59.0_6_1

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  • 1-1-15 土壌炭素放出のプライミング効果におけるマクロポアの役割(1-1 物質循環・動態,2013年度名古屋大会) Reviewed

    末継 淳, 森 也寸志

    日本土壌肥料学会講演要旨集   59 ( 0 )   5 - 5   2013

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    Language:Japanese   Publisher:一般社団法人 日本土壌肥料学会  

    DOI: 10.20710/dohikouen.59.0_5_3

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  • Determining storm sampling requirements for improving precision of annual load estimates of nutrients from a small forested watershed Reviewed

    Jun'ichiro Ide, Masaaki Chiwa, Naoko Higashi, Ryoko Maruno, Yasushi Mori, Kyoichi Otsuki

    ENVIRONMENTAL MONITORING AND ASSESSMENT   184 ( 8 )   4747 - 4762   2012.8

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    This study sought to determine the lowest number of storm events required for adequate estimation of annual nutrient loads from a forested watershed using the regression equation between cumulative load (aL) and cumulative stream discharge (aQ). Hydrological surveys were conducted for 4 years, and stream water was sampled sequentially at 15-60-min intervals during 24 h in 20 events, as well as weekly in a small forested watershed. The bootstrap sampling technique was used to determine the regression (aL-aQ) equations of dissolved nitrogen (DN) and phosphorus (DP), particulate nitrogen (PN) and phosphorus (PP), dissolved inorganic nitrogen (DIN), and suspended solid (SS) for each dataset of aL and aQ. For dissolved nutrients (DN, DP, DIN), the coefficient of variance (CV) in 100 replicates of 4-year average annual load estimates was below 20% with datasets composed of five storm events. For particulate nutrients (PN, PP, SS), the CV exceeded 20%, even with datasets composed of more than ten storm events. The differences in the number of storm events required for precise load estimates between dissolved and particulate nutrients were attributed to the goodness of fit of the aL-aQ equations. Bootstrap simulation based on flow-stratified sampling resulted in fewer storm events than the simulation based on random sampling and showed that only three storm events were required to give a CV below 20% for dissolved nutrients. These results indicate that a sampling design considering discharge levels reduces the frequency of laborious chemical analyses of water samples required throughout the year.

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  • Impact of suspended sediment and nutrient loading from land uses against water quality in the Hii River basin, Japan

    H. Somura, I. Takeda, J. G. Arnold, Y. Mori, J. Jeong, N. Kannan, D. Hoffman

    JOURNAL OF HYDROLOGY   450   25 - 35   2012.7

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    Lake Shinji lies in eastern Shimane Prefecture, and is typical of brackish lakes in Japan. Water quality of the lake does not meet the expected environmental standards for total nitrogen (TN) and total phosphorus (TP), even though the national and prefectural governments have tried to improve water quality by developing maintenance scenarios for sewage, plant effluent, agricultural activity, and forestry. Consequently, detailed data of nutrient loading to the lake from river inflows is crucial to support strategies for improving the lake water environment. The Hii River contributes approximately 80% of the discharge flowing into the lake. In this study, we examine the Hii River catchment with a focus on land uses such as paddy fields, upland fields, residential areas, and forestry. Average annual discharges of suspended sediment (SS), TN, and TP loads were determined at Otsu, near the outlet of the basin into Lake Shinji. We also determined average yield per unit area of SS, TN, and TP loads from each land use. Yields per unit area from upland areas were the greatest, whereas yields from forests were the lowest. Forests were the largest contributor of SS, TN, and TP in the basin, because of its dominant land area. Upland fields had the second largest impact on these loads in the basin, because fertilizer applied to the fields is a major source of nitrogen (N) and phosphorus (P). large differences in yields per unit area between fine and rainy day conditions were also observed, especially for SS and TP loads. Furthermore, we determined that a major pathway of N to the river was through groundwater, regardless of land use, whereas P was transported to the river with sediments, especially in paddy and upland fields. Based on these analyses, it will be difficult to reduce the SS load discharge in the basin in the future, because forestry is the major source. In contrast, N and P load reductions are straightforward, because the primary source is agricultural, and appropriate management of fertilizer application will be a key factor in reducing loads. (c) 2012 Elsevier B.V. All rights reserved.

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  • The Outcome and Evaluation of Creating Local Activate Human Resources Fostering Institutions in a Case Study of Shimane University Reviewed

    3   175 - 183   2012.3

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  • Analysis of present thinning conditions on the sugi (Cryptomeria japonica) plantation forests in Okinoshima, Shimane Prefecture, Japan

    Takahashi Erina, Yone Yasumichi, Mori Yasushi, Somura Hiroaki, Ide Jun'ichiro, Sato Toshio, Takeuchi Michiyuki

    Applied Forest Science   21 ( 2 )   9 - 16   2012

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    To establish management criteria for watershed forests, basic studies on sugi (Cryptomeria japonica) plantation forests were performed at Okinoshima, Shimane Prefecture, Japan. Fourteen forests were surveyed. In nine forests, which had not been thinned in over 10 years (not-thinned forest), the relative yield index (Ry) was >0.8 and stand density was high. In two forests, which had been thinned in the past 10 years (recently thinned forest), Ry was <0.7 and stand density was low; these values were consistent with the yield table for the San-in region (western part of the Japan Sea littoral zone). In two other recently thinned forests, Ry was >0.7 and stand density was high. In the remaining recently thinned forest, Ry was >0.9 and stand density was very high, despite being thinned recently. Stand density was high after thinning because (1) the forest owner had no clear production target, (2) the forest was thinned only to meet criteria for financial support from the government, and (3) stand density was extremely high before thinning. A definition of thinning is to thin trees to achieve a production or management target; however, with no clear target, the thinning of very dense forests is not for maintenance, but simply to cut some of the trees. Criteria for obtaining financial support from the government involves the ratio of cut trees to total trees before thinning; thus, very dense forests can still remain dense, even after thinning. Therefore, criteria for acquiring financial support from the government must be reconsidered.

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  • Tailor-made restoration technique for degraded soils -controlling infiltration process in soils- Invited

    MORI Yasushi

    Chemical Engineering of Japan   75 ( 12 )   792 - 794   2011.12

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  • Characterizing Soil Infiltration Water Quality in Forest Watershed during Heavy Rainfall

    Morisawa Taihei, Mori Yasushi, Ide Jun'ichiro, Somura Hiroaki, Takeda Ikuo, Inoue Mitsuhiro

    Journal of Rainwater Catchment Systems   16 ( 2 )   47 - 53   2011

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    Soil infiltration process greatly contributes to the hydrological process in watershed, thus, soil infiltration water and runoff water were collected to characterize pollutant load from two planted forests. Especially, this study focused on the heavy rain which is reported to be increasing because of climate change. Glass fiber wick samplers were used to collect soil infiltration water samples, while runoff water was collected at the weir. Results showed that the wick sampler successfully collected the soil infiltration water without accumulating excess water above the device. The amounts of pollutant loads in soil infiltration water (total organic carbon; TOC, total nitrogen; TN) were positively correlated with pollutant loads in runoff water, which directly showed the contribution of soil water to runoff water. During the research period, environmental pollution load density in soil infiltration water was negatively correlated with sampled soil water volume. This could be a dilution effect caused by rainfall infiltration. However, after the heavy rainfall, soil infiltration water quality showed higher concentration than other rainfall events. The trend was clear in the long lasting strong rainfall, especially for well conductive forest slope. Because of the high permeable properties, pollutant loads from the soil surface easily reached to the depth of glass fiber wick (50cm depth), without filtering process through the soil body.

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  • Potential soil water repellency in the Ochozu Experimental Watershed dominated by a Japanese cypress (Chamaecyparis obtusa) plantation Reviewed

    Jun'ichiro Ide

    Bulletin of the Kyusyu University Forests   92 ( 92 )   8 - 12   2011

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    DOI: 10.15017/19559

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  • Examining soil organic matter based on its interaction with mineral particles

    WAGAI Rota

    The Japanese Forest Society Congress   123   H11 - H11   2011

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  • Recovery of phosphorus from natural water bodies using iron-oxidizing bacteria and woody biomass Reviewed

    Ikuo Takeda, Hiroaki Somura, Yasushi Mori

    ECOLOGICAL ENGINEERING   36 ( 8 )   1064 - 1069   2010.8

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    There is a global concern that phosphorus (P) resources will be depleted in the near future, but the P flux from water to land is extremely limited, whereas the reverse flux is substantial. A new method for the recovery of P from natural water bodies was proposed using iron-oxidizing bacteria and woody biomass (heartwood of conifer) as a carrier and a practical demonstration was presented. The woody carrier was immersed in water abundant in iron-oxidizing bacteria and removed 1-10 weeks later. Our results showed that the immersed carrier collected biogenic iron (Fe) oxides produced by iron-oxidizing bacteria, and contained about 0.2 mg g(-1) of P after 3 weeks; this amount was higher than that contained in some P fertile soils used for cultivating plants. The biogenic Fe oxides on the carrier acted as a source of P for plant cultivation, and they could adsorb P from P-rich solutions (10 mg L(-1) of PO(4)-P). Although our study involved only a small-scale trial, the proposed method can potentially aid in the effective use of Pin water and in water quality improvement if conducted on a large scale. (C) 2010 Elsevier B.V. All rights reserved.

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  • 多周波数電磁探査による土壌環境の特徴抽出と潜在的汚濁負荷の推測

    Yasushi Mori,Jyunitiro Ide,Soumura Hiroaki,Taihei Morisawa

    25 - 29   2010.4

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  • 降雨強度と雨水の水質が土壌浸透流出水の水質へ及ぼす影響

    Jounal of the Japanese Society of Soil Physics   ( 114 )   3 - 10   2010

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  • 栄養塩浸透域制御によるバイオレメディエーションの効率化

    藤原篤志, 森 也寸志, 松本祐子

    土木学会論文集G   66 ( 4 )   187 - 193   2010

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  • EM sounding characterization of soil environment in artificial forest.

    MORI Yasushi, IDE Jun'ichiro, SOMURA Hiroaki, MORISAWA Taihei

    Proceeding of Annual Conference   23   132 - 132   2010

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    A multi-frequency electro-magnetic (EM) sounding method was applied to the agriculture field to investigate the characteristics of non-point pollution load. Soil environmental properties such as differences in land management were analyzed with electrical conductivity (EC) maps. In addition, vertical EC profiles obtained from EM soundings were compared with EC in drainage ditch or river water. As results, surface soil EC maps successfully extracted the differences in land management affected by fertilizer application. Moreover, surface EC at the vertical profiles strongly related with drainage ditch or river EC.

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  • Discussion on cause and countermeasure of increasing trends in water quality of an under-populated watershed

    Takeda Ikuo, Somura Hiroaki, Mori Yasushi

    Proceeding of Annual Conference   23   93 - 93   2010

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    An investigation of the water quality in an under-populated watershed was conducted over a 15-year period in which data was collected at weekly intervals. In the study watershed, the pollutants derived from human activities decreased, but no clear decrease in the parameters of water quality was observed, and some nitrogen and phosphorus concentrations increased even though no significant change in precipitation occurred. A possible hypothesis explaining this lack of a clear decrease in water quality is that specific pollutant outflows from forests and agricultural lands may have increased in recent years. In addition, a new method for phosphorus recovery from natural water bodies was proposed using iron-oxidizing bacteria and woody biomass.

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  • Sensitivity analyses of hydrologic and suspended sediment discharge in the abashiri river basin, hokkaido region, Japan

    H. Somura, I. Takeda, Y. Mori

    International Agricultural Engineering Journal   18 ( 1-2 )   27 - 39   2009.12

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    The Soil and Water Assessment Tool (SWAT) was applied to the Abashiri River basin from 2001 to 2007 using a daily time step. After confirming the reproducibility of the model, hydrological sensitivity analyses against monthly river discharge, evapotranspiration (ET), snow water equivalent (SWE), and suspended sediment (SS) load were conducted under various climate change scenarios. The results of calibration and validation indicated that the model provided satisfactory representation of the flow and SS load discharge. In addition, the hydrological sensitivity analyses revealed that the influence of climate change in the basin will be stronger during winter than summer, especially from January to March. Variation analyses revealed that discharge increased drastically under every scenario from January to March, with the exception of a combination of a 20% decrease in precipitation and a 1°C increase in temperature in January. Furthermore, the ET increased greatly in March due to a multiplier effect of natural conditions and temperature increase scenarios. Moreover, although the SWE decreased in almost all cases, it increased in some cases in December, January, and February. Increasing snow melt in response to an early thawing season and/or precipitation during winter resulted in an increase in SS load discharge, especially during February. On an annual basis, the mean SS load decreased in every scenario except for those in which precipitation increased. © 2009 AAAE.

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  • Controlling solute transport processes in soils by using dual-porosity characteristics of natural soils

    Yasushi Mori, Naoko Higashi

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   347 ( 1-3 )   121 - 127   2009.9

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    Soils are notorious for their heterogeneity, and macropores conduct solutions by bypassing the surrounding soils, sometimes wasting the applied fertilizer or remediation chemicals. It would be beneficial in agriculture or environmental engineering fields if solute transport in soils were controlled with relatively simple techniques. In this study, the solute transport process was controlled using dual-characteristics of the soil pore system. Specifically convection and dispersion were controlled by changing the structure-dependent flow regime. Soil samples with/without artificial small macropores (diameter = 1 mm) and undisturbed soil samples were prepared, and solute transport experiments were conducted, in which a variety of breakthrough curves (BTC) was obtained by changing flow rate (from 1 to 0.1 of saturated conductivity) and saturation (saturation to -3 kPa). The results for the artificial macropore system showed that completely different BTCs were obtained with small suction differences, namely saturation and -3 kPa. At saturation, the BTC showed a bi-modal distribution typical for soils with macropores. At a slightly unsaturated condition of -3 kPa, however, the BTC showed a normal distribution quite similar to that of a repacked soil column. The results for undisturbed soil showed that the BTC gradually transitioned from a bi-modal to normal distribution, with the suction changing from saturation to only -3 kPa. These results suggest that effective use of fertilizer or remediation chemicals is possible with a relatively simple and inexpensive technique. even when macropore networks are present. (C) 2009 Elsevier B.V. All rights reserved.

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  • 浸透現象制御による汚染土壌の浄化 : 土壌物理学の顧点から Invited

    森 也寸志

    化学工学 = Chemical engineering   73 ( 8 )   379 - 382   2009.8

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  • Impact of climate change on the Hii River basin and salinity in Lake Shinji: a case study using the SWAT model and a regression curve

    H. Somura, J. Arnold, D. Hoffman, I. Takeda, Y. Mori, M. Di Luzio

    HYDROLOGICAL PROCESSES   23 ( 13 )   1887 - 1900   2009.6

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    The impacts of climate change oil water resources were analysed for the Hii River basin and downstream Lake Shinji. The variation between saline and fresh water within these systems means that they encompass diverse ecosystems. Changes in evapotranspiration (ET), snow water equivalent, discharge into the basin, and lake salinity were determined for different climate scenarios. The impact of climate change on a brackish water clam found in the lake was then examined using simulated monthly variations of lake salinity and information from prior Studies of the clam.
    ET increased and snow water equivalent decreased for all scenarios incorporating temperature rise, particularly during the winter season. Furthermore, ET and snow water equivalent were not as sensitive to variations in precipitation and thus temperature rise was considered to be a major factor for these variables. Nevertheless, monthly discharge Volume was more influenced by variation in precipitation than variations in temperature. Discharge increased during both the summer and winter season, since precipitation contributed to river discharge instead of being stored as snow pack during the winter season. The magnitudes of salinity dilutions and concentrations predicted under the climate change scenarios Would not be lethal for adult clams. However, the egg-laying season of the clam would coincide with periods of strong salinity dilution in the lake. Since juveniles are less tolerant to changes in salinity, future generations of the clam may be affected and reproduction of the clam may be reduced by increasing precipitation in the future. Copyright (C) 2009 John Wiley & Sons, Ltd.

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  • Influence of puddling procedures on the quality of rice paddy drainage water

    Hiroaki Somura, Ikuo Takeda, Yasushi Mori

    AGRICULTURAL WATER MANAGEMENT   96 ( 6 )   1052 - 1058   2009.6

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    Drainage water quality in rice paddies was strongly influenced by the puddling of soil in the paddy fields by tractors and in response to opening of drainage gates. The concentrations of contaminants in drainage water increased rapidly when the puddling process began and were maintained at high concentrations throughout the puddling period. Moreover, the high concentrations did not decrease immediately after the puddling procedures ceased. Additionally, the ratio of dissolved nitrogen and phosphorous to total nitrogen and total phosphorous increased daily during the last half of the puddling period, due to discharge of chemical fertilizers with the drainage water. Also, the loads of particulate nitrogen and phosphorus discharged during the puddling period were larger than the loads discharge during irrigation. The discharge from paddy fields during puddling also increased the total annual contaminant load. (C) 2009 Elsevier B.V. All rights reserved.

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  • 栄養塩浸透域制御による油汚染土壌の微生物活性の最大化

    Yasushi Mori,Atsushi Fujiwara,Yuko Matsumoto

    501 - 505   2009.4

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  • 油汚染土壌の浄化における栄養塩注入速度の効率化

    Yasushi Mori; Mai Matsuda

    Journal of environmental conservation engineering   38 ( 8 )   566 - 572   2009

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  • Enstimation of Environmental Load using Multi-frequency Electromagnetic Sounding

    Mori Yasushi, Somura Hiroaki, Egusa Naokazu, Ide Jun'ichiro, Morisawa Taihei

    Proceeding of Annual Conference   22   80 - 80   2009

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    A multi-frequency electro-magnetic (EM) sounding method was applied to the agriculture field to investigate the characteristics of non-point pollution load. Soil environmental properties such as differences in land management were analyzed with electrical conductivity (EC) maps. In addition, vertical EC profiles obtained from EM soundings were compared with EC in drainage river. As results, surface soil EC maps successfully extracted the differences in land management affected by fertilizer application. Moreover, surface EC at the vertical profiles strongly related with drainage river EC, showing most of the EC in the water was explained by surface EC maps at the EM sounding data. The proposed method has strength in obtaining EC data without sampling river water.

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  • Characterizing infiltration soil water quality during regional heavy rainfall.

    Morisawa Taihei, Mori Yasushi, Ide Jun'ichiro, Somura Hiroaki, Takeda Ikuo, Inoue Mitsuhiro

    Proceeding of Annual Conference   22   131 - 131   2009

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  • 土壌浸透水採取による山林斜面における面源負荷の形成過程の解明 Reviewed

    森 也寸志,宗村広昭,武田育郎

    環境技術   37 ( 11 )   23 - 27   2008.4

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  • 地球型惑星における生命活動のための「土壌」改良技術について

    森也寸志

    宇宙利用シンポジウム   24th   370 - 371   2008.3

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  • Effects of zeolite on soil nutrients and growth of barley following irrigation with saline water

    Ahmed Al-Busaidi, Tahei Yamamoto, Mitsuhiro Inoue, A. Egrinya Eneji, Yasushi Mori, Muhammad Irshad

    JOURNAL OF PLANT NUTRITION   31 ( 7 )   1159 - 1173   2008

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    Soil salinity is a major abiotic factor limiting crop production but an amendment with synthetic zeolite may mitigate effects of salinity stress on plants. The objective of the study was to determine the effects of zeolite on soil properties and growth of barley irrigated with diluted seawater. Barley was raised on a sand dune soil treated with calcium type zeolite at the rate of 1 and 5% and irrigated every alternate day with seawater diluted to electrical conductivity (EC) levels of 3 and 16 dS m(-1). Irrigation with 16 dS m(-1) saline water significantly suppressed plant height by 25%, leaf area by 44% and dry weight by 60%. However, a substantial increase in plant biomass of salt stressed barley was observed in zeolite-amended treatments. The application of zeolite also enhanced water and salt holding capacity of soil. Post-harvest soil analysis showed high concentrations of calcium (Ca(2+)), magnesium (Mg(2+)), sodium (Na(+)), and potassium (K(+)) due to saline water especially in the upper soil layer but concentrations were lower in soils treated with zeolite. Zeolite application at 5% increased Ca(2+) concentration in salt stressed plants; concentrations of trace elements were also increased by 19% for iron (Fe(2+)) and 10% for manganese (Mn(2+)). The overall results indicated that soil amendment with zeolite could effectively ameliorate salinity stress and improve nutrient balance in a sandy soil.

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  • 多周波電磁探査法による土壌環境モニタリング

    平井優也, 森 也寸志, 宗村広昭, 江草直和, 森澤太平

    土壌の物理性   ( 109 )   3 - 14   2008

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  • 土壌浸透水採取による山林斜面における面源負荷の形成過程の解明,

    森 也寸志, 宗村広昭, 武田育郎

    環境技術   37 ( 11 )   1 - 6   2008

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  • Relationship between farming activities and water quality variations of drainage water from paddy fields area

    Hiroaki Somura, Ikuo Takeda, Yasushi Mori

    World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008   316   2008

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    We paid attention to relationship between farming activities and changes in drainage water quality from a paddy fields area, especially in land preparation period for transplanting of paddy. Drainage water quality during land preparation period became highest concentration of all items through a year. In 2006, average water qualities in the period were 7.9 mg/L in T-N, 1.6 mg/L in T-P, 15.3 mg/L in TOC, and 372 mg/L in SS. In addition, maximum values in the period were 36.2 mg/L in T-N, 12.3 mg/L in T-P, 83.2 mg/L in TOC, and 3020 mg/L in SS. The changes in water quality moved on with land preparation by tractor and drainage gate operation on each paddy field by farmers. Moreover, relatively high concentrations of drainage water were also observed during non-irrigation period. As no agricultural activities were done during the period, it is considered that residual nutrient in soil will infiltrate by rain water and flow to the drainage channel. © 2008 ASCE.

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  • Soil Environment Monitoring by Multi-frequency Electromagnetic Sounding

    Mori Yasushi, Somura Hiroaki, Hirai Yuuya, Egusa Naokazu, Morisawa Taihei

    Proceeding of Annual Conference   21   8 - 8   2008

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    Surface soil environment was characterized using a multi-frequency electromagnetic wave (EM) sensor. Five frequencies were applied so that we obtained vertical profile of the domain. Forest under different management, winter-ponded paddy field, orchard and tea farm in hilly mountainside and orchard in plain field were investigated. Surface electrical conductivity obtained by Wenner array has the highest correlation with 47970Hz data, showing it is the appropriate frequency for surface soil investigation. Several tens milli-Siemens data obtained by EM sounding corresponded very well with the EC obtained by traditional method. Conductivity data successfully showed management induced changes in soil environment by conductivity map along with vertical conductivity profile.

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  • Characterizing hydrological processes during heavy rain in planted forest watersheds as affected by infiltration properties of surface soils.

    Morisawa Taihei, Mori Yasushi, Egusa Naokazu, Somura Hiroaki, Takeda Ikuo, Inoue Mitsuhiro

    Proceeding of Annual Conference   21   92 - 92   2008

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    It is suggested that extensive forestry may cause water pollution during heavy rain. However, it is not explained by the water quality analysis because mixing or dilution process may occur in the stream water. In this study, soil infiltration water and runoff water were sampled and analyzed to characterize hydrological processes in two planted forests (SR1: without thinning operation, SR2: with thinning operation). Soil infiltration water analysis, thus, clearly showed the hydrological processes in the forest soils. These results showed that the dilution effect in SR2 (with thinning operation) was not effective during heavy rain event. The well-maintained SR2 could not hold the buffering potential and high pollution load drained to run off water during the heavy rainfall event.

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  • 管理状態の異なる森林からの集中豪雨に伴う汚濁負荷流出特性―土壌浸透水直接採取からの観察―

    森澤太平, 森也寸志, 江草直和, 宗村広昭, 井上光弘

    応用水文   ( 20 )   11-20. - 20   2007.12

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  • Effects of seawater salinity on salt accumulation and barley (Hordeum vulgare L.) growth under different meteorological conditions

    Ahmed Al-Busaidi, Tahei Yamamoto, Mitsuhiro Inoue, Muhammad Irshad, Yasushi Mori, Satoshi Tanaka

    JOURNAL OF FOOD AGRICULTURE & ENVIRONMENT   5 ( 2 )   270 - 279   2007.4

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    Water uptake by plants and evaporation from the soil surface usually govern the salts dynamics in the soil and is highly related to the climatic conditions. Poor management of saline water may increase the soil salinity to a level higher than crop tolerance. The comparative investigations of saline water effects on soil and crops under various environments are lacking. Therefore pot experiments were carried out to evaluate the effects of saline irrigations on barley and accumulation of salts in sand dune soil under three conditions - glasshouse, growth chamber and greenhouse. Plants were irrigated with diluted seawater adjusted to three levels of electrical conductivity: 3, 8 and 13 dS m(-1). The results of the experiments showed that saline waters and experimental conditions remarkably affected the evapotranspiration rate, soil moisture, salt accumulation and plant biomass production. Low temperature conditions exhibited highest plant growth and soil moisture and lowest salt deposition. Plants showed no symptoms of salt stress in the glasshouse. Growth chamber and greenhouse profoundly reduced plant biomass and higher salt accumulation in the soil. Higher stress of salinity was noticed in plants irrigated with high saline water. Higher amount of salts in the water impaired dry shoot yield by an average of 60%. The temperature conditions of greenhouse and growth chamber caused substantial water loss and induced water deficit situation in plants. A good management of saline water is a necessary option for a sustainable agriculture in salt affected soils. The use of high saline water for crops may carefully be rationalized in the warm climate.

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  • 砂質土壌における塩水を用いた地中灌漑法の改良とそれに伴う水利用効率,塩類土壌への影響.

    Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering   ( 252 )   25-32. - 32   2007

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  • 不飽和土壌中の下方浸透水モニタリング ?自動吸引圧制御型サンプラーによる肥料溶脱傾向の把握?

    Naoko Higashi,Yasushi Mori,Mituhiro Inoue

    6 ( 6 )   44 - 48   2007

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  • Monitoring saline irrigation effects on barley and salts distribution in soil at different leaching fractions

    Ahmed Al-Busaidi, Tahei Yamamoto, Mitsuhiro Inoue, Yasushi Mori, Muhammad Irshad, A. Zahoor

    Asian Journal of Plant Science   6 ( 5 )   718 - 722   2007

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  • Report on the 3rd International Conference on Mechanisms of Organic Matter Stabilisation and Destabilisation in Soils and Sediments

    Wagai Rota

    Japanese Journal of Soil Science and Plant Nutrition   78 ( 6 )   645 - 645   2007

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    DOI: 10.20710/dojo.78.6_645

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  • 流域水物質循環解明のための土壌浸透水直接採取法の開発

    Naoshi Takata, Yasushi Mori,Naoko Higashi

    345 - 349   2006.4

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  • 移流・分散制御による油汚染土壌の浄化効率の最適化

    Yasushi Mori,Yuko Matsumoto

    581 - 584   2006.4

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  • 不飽和土壌中の根群域からの下方浸透水モニタリング

    Naoko Higashi, Yasushi Mori,Mitsuhiro Inoue

    79 - 84   2006.4

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  • 浸透速度制御による油汚染土壌の浄化率の最適化

    Yuko Matsumoto, Yasushi Mori,

    144 - 148   2006.4

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  • Multi-functional heat pulse probe measurements of coupled vadose zone flow and transport

    AP Mortensen, JW Hopmans, Y Mori, J Simunek

    ADVANCES IN WATER RESOURCES   29 ( 2 )   250 - 267   2006.2

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    Simultaneous measurement of coupled water, heat, and solute transport in unsaturated porous media is made possible with the multi-functional heat pulse probe (MFHPP). The probe combines a heat pulse technique for estimating soil heat properties, water flux, and water content with a Wenner array measurement of bulk soil electrical conductivity (ECbulk). To evaluate the MFHPP, we conducted controlled steady-state flow experiments in a sand column for a wide range of water saturations, flow velocities, and solute concentrations. Flow and transport processes were monitored continuously using the MFHPP. Experimental data were analyzed by inverse modeling of simultaneous water, heat, and solute transport using an adapted HYDRUS-2D model. Various optimization scenarios yielded simultaneous estimation of thermal, solute, and hydraulic parameters and variables, including thermal conductivity, volumetric water content, water flux, and thermal and solute dispersivities. We conclude that the MFHPP holds great promise as an excellent instrument for the continuous monitoring and characterization of the vadose zone. (C) 2005 Elsevier Ltd. All rights reserved.

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  • Effective Suction Control for Infiltration Water Sampling in Unsaturated Soils

    HIGASHI Naoko, MORI Yasushi, INOUE Mitsuhiro

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES   19 ( 3 )   221 - 227   2006

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    We investigated the applicability of the infiltration water sampling system using a suction-controlled flux sampler in various soils. When a glass filter was used in a sandy soil, the simulation results from HYDRUS-2D model indicated that once the matric potential above the filter (hC) decreased rapidly by suction application, a zone of low water content was remained above the filter. When the next infiltration water approached the filter, the low water content zone was packed between the filter and the infiltration water. That was showing a lower hC than the matric potential in the natural soil profile (hL, hR). This phenomenon was also observed when a glass filter was applied to loam and silt loam soils. In contrast, hC was higher than hL and hR when using a porous plate and membrane filters, which have low permeability. These results indicated that appropriate selection of a sampling filter and boundary condition was required for better sampling, when a suction-controlled flux sampler was applied to various soils. Because the filter permeability and soil properties affected the criterion for suction control, their combination and the existence of low water content zone between the filter and soil should be considered.

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  • 砂質土壌における2深度からの地中塩水灌漑

    Shingo Yamasaki, Mitsuhiro Inoue, Taihei Yamamoto, Yasushi Mori

    Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering   243 ( 243 )   57 - 64   2006

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  • Estimation of vadose zone water flux from multi-functional heat pulse probe measurements

    Y Mori, JW Hopmans, AP Mortensen, GJ Kluitenberg

    SOIL SCIENCE SOCIETY OF AMERICA JOURNAL   69 ( 3 )   599 - 606   2005.5

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    A small multi-functional heat pulse probe (MFHPP) was applied to further develop measurement methodologies to improve on water flux estimations for unsaturated soils. The temperature responses of four thermistors surrounding a central heater in a 2.7-cm diam. probe were analyzed by the heat transport equation to estimate thermal properties and convective heat flow. Volumetric heat capacity, water content, and thermal diffusivity were estimated from the horizontally placed thermistors, neglecting the convective flow effects in the transverse direction, whereas the water flux density was estimated from the temperature responses to the vertically placed thermistors. A parameter optimization technique was employed to fit the most likely parameters to the relevant analytical solutions. Failing head and multistep outflow experiments yielded independently obtained water flux measurements. Results showed that the estimated volumetric water content corresponded well with independent gravimetric measurements with a RMSE of 0.0056 m(3) m(-3), across a wide range of water fluxes smaller than 0.5 m d(-1). Thermal diffusivity values as obtained with the MFHHP also agreed well with independently measured thermal diffusivity values, for water flux density values smaller than 2 to d(-1). For saturated conditions, the estimated water fluxes from the MFHPP measurements were accurate in the range between 0.056 and 27.0 m d(-1), with a R of 0.995 and RSME of 0.0952 log(m d(-1)) (0.52 m d(-1)). For unsaturated flow, MFHHP estimations significantly overestimated water flux density for flux values smaller than 0.10 to d(-1). Within these limitations, we conclude that MFHPP methodologies are now available, making possible simultaneous estimation of thermal diffusivity and water flux density in unsaturated soils.

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  • 土壌環境モニタリングのための不飽和土壌中の下方浸透水量測定装置の開発

    Naoko Higashi, Yasushi Mori, Mitsuhiro Inoue

    256 - 260   2005.4

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  • 熱パルスセンサーによる土壌油汚染の計測技術の構築

    Yoko Matsumoto, Yasushi Mori

    138 - 141   2005.4

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  • Measurement of fertilizer leaching from root zone using an automated infiltration soil water sampler in an unsaturated sandy field

    N. Higashi, Y. Mori and M. Inoue

    Soil Sci. and Plant Nutr.   51 ( 7 )   1023 - 1033   2005

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  • 油汚染土壌の浄化における栄養塩注入速度の最適化

    Yasushi Mori,Tetsuji Miyabayashi,Koutaro Kitamura

    336-339   336 - 339   2005

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  • Salt Leaching and Plant Rooting Effects of Sea Water Application in Coastal Area, Oman.

    日本砂丘学会誌   52(2) 43-50   2005

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  • 自動サクション制御による不飽和砂質土壌中の下方浸透水採取装置の開発.

    Jounal of tha Japanese Society of Soil Physics   101 27-35 ( 101 )   27 - 35   2005

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  • The Role and Functions of Soil Organic Constituents in the Terrestrial Ecosystem and Environment

    Aoyama Masakazu

    Japanese Journal of Soil Science and Plant Nutrition   75 ( 4 )   511 - 512   2004

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    DOI: 10.20710/dojo.75.4_511_2

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  • Multi-Functional Heat Pulse Probe for the Simultaneous Measurement of Soil Water Content, Solute Concentration, and Heat Transport Parameters

    Y. Mori, J. W. Hopmans, A. P. Mortensen, G. J. Kluitenberg

    VADOSE ZONE JOURNAL   2 ( 4 )   561 - 571   2003.11

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    Water, solute, and heat transport processes in soils are mutually interdependent as each includes convective water flow and each transport mechanism is partly controlled by fluid saturation, pore geometry, temperature, and other soil environmental conditions. Therefore, their measurement in approximately identical measurement locations and volume is essential for understanding transport phenomena in soils. We introduce a 2.7-cm-diameter multi-functional heat pulse probe (MFHPP), which consists of a single central heater, four thermistors, and four electrodes (Wenner array) that together are incorporated in six 1.27-mm-o.d. stainless-steel tubes. The bulk soil thermal properties and volumetric water content of Tottori Dune sand were determined from the measurement of the temperature response of all four thermistor sensors after application of an 8-s heat pulse by the heater sensor. Simultaneously with the temperature measurements, the bulk soil electrical conductivity (EC(b)) was measured using the Wenner array, from which soil solution concentration (EC(w)) can be obtained after calibration. All measurements were taken during multistep outflow experiments, which also allowed estimation of the soil's hydraulic properties. We demonstrated that the MFHPP can effectively measure volumetric water content, thermal properties, and EC(b), and can be used to indirectly estimate soil water fluxes at rates larger than 0.7 m d(-1) in the sand.

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  • Assessment and field-scale mapping of soil quality properties of a saline-sodic soil

    DL Corwin, Kaffka, SR, JW Hopmans, Y Mori, JW van Groenigen, C van Kessel, SM Lesch, JD Oster

    GEODERMA   114 ( 3-4 )   231 - 259   2003.6

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    Salt-affected soils could produce useful forages when, irrigated with saline drainage water. To assess the productive potential and sustainability of using drainage water for forage production, a saline-sodic site (32.4 ha) in California's San Joaquin Valley was characterized for soil quality. The objectives were (1) to spatially characterize initial soil physicochemical properties relevant to maintaining soil quality on an and zone soil and (2) to characterize soil quality relationships and spatial variability.
    An initial mobile electromagnetic (EM) induction survey was conducted in 1999, with bulk soil electrical conductivity (ECa) readings taken at 384 geo-referenced locations, followed by an intensive mobile fixed-array survey with a total of 7288 geo-referenced ECa readings. Using the EM data and a spatial statistics program (ESAP v2.0), 40 sites were selected that reflected the spatial heterogeneity of the ECa measurements for the study area. At these sites, soil-core samples were taken at 0.3-m intervals to a depth of 1.2 m. Duplicate samples were taken at eight sites to study the local-scale variability of soil properties. Soil-core samples were analyzed for a variety of physical and chemical properties related to the soil quality of and zone soils.
    Soils were found to be highly spatially heterogeneous. For composite soil-core samples taken to a depth of 1.2 m, ECe (electrical conductivity of the saturation extract) varied from 12.8 to 36.6 dS m(-1), SAR from 28.8 to 88.8, and clay content from 2.5% to 48.3%. B and Mo concentrations varied from 11.5 to 32.2 mg l(-1) and 476.8 to 1959.6 mug l(-1), respectively. CaCO3, NO3- in the saturation extract, exchangeable Ca2+, Se, and As consistently had the highest coefficients of variation (CV) while pH(e), Pb, and Ca2+ in the saturation extract consistently had the lowest CVs at all depths. A one-way analysis of variance (ANOVA) was used to spatially partition the local- and global-scale variability. Local-scale variability was greatest for pH,. Laboratory measurements of saturated hydraulic conductivity (K-s) were very low (0.0000846-0.0456 cm h(-1)), whereas field measurements were considerably higher (0.49-1.79 cm h(-1)). Based on the Cl- data, the leaching fraction (LF) for the entire study area was estimated to be 17%.
    Soil quality was reflected in yield and chemical analysis of forage. Forage Mo contents determined from newly established Bermuda grass varied from 1 to 5 mg kg(-1) on a dry matter basis, and Cu/Mo ratios averaged 3.3, while forage yield in the establishment year declined with ECe, and failed to grow above ECe levels of approximately 22 dS m(-1). The initial soil quality assessment of the research site indicated that the sustainability of drainage water reuse at this location would depend upon maintaining, a sufficient LF with careful consideration and management of salinity, boron, molybdenum, and sodium levels. (C) 2003 Elsevier Science B.V. All rights reserved.

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  • Multi-functional heat pulse probe for the simultaneous measurement of soil water content, solute concentration, and heat transport parameters

    Y. Mori, J. W. Hopmans, A. P. Mortensen, G. J. Kluitenberg

    Vadose Zone Journal   2 ( 4 )   561 - 571   2003

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    Water, solute, and heat transport processes in soils are mutually interdependent as each includes convective water flow and each transport mechanism is partly controlled by fluid saturation, pore geometry, temperature, and other soil environmental conditions. Therefore, their measurement in approximately identical measurement locations and volume is essential for understanding transport phenomena in soils. We introduce a 2.7-cm-diameter multi-functional heat pulse probe (MFHPP), which consists of a single central heater, four thermistors, and four electrodes (Wenner array) that together are incorporated in six 1.27-mm-o.d. stainless-steel tubes. The bulk soil thermal properties and volumetric water content of Tottori Dune sand were determined from the measurement of the temperature response of all four thermistor sensors after application of an 8-s heat pulse by the heater sensor. Simultaneously with the temperature measurements, the bulk soil electrical conductivity (ECb) was measured using the Wenner array, from which soil solution concentration (ECw) can be obtained after calibration. All measurements were taken during multistep outflow experiments, which also allowed estimation of the soil's hydraulic properties. We demonstrated that the MFHPP can effectively measure volumetric water content, thermal properties, and ECb, and can be used to indirectly estimate soil water fluxes at rates larger than 0.7 m d-1 in the sand. © Soil Science Society of America.

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  • 茶園小流域からの窒素,リン,CODの排出負荷量の推定

    水環境学会誌   25(9):565-570   2002

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  • Role of dissolved organic carbon in forest soil carbon dynamics : relationship between microbial degradation of DOC and CO_2 production(<Feature>Toward new approaches for understandings of biogeochemical cycles in forested ecosystems)

    WAGAI Rota, SOLLINS Phillip

    JAPANESE JOURNAL OF ECOLOGY   52 ( 1 )   111 - 117   2002

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    DOI: 10.18960/seitai.52.1_111

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  • 軟X線による土壌間隙構造および水移動機構の可視化と解析に関する研究

    森 也寸志

    農業土木学会誌 = Journal of the Agricultural Engineering Society, Japan   69 ( 1 )   85 - 87   2001.1

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    DOI: 10.11408/jjsidre1965.69.85

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  • 鳥取県西部地震による農地および農業施設の被害

    森 也寸志, 石井将幸, 木原康孝, 福櫻盛一

    農業土木学会誌   69 ( 1 )   71 - 75   2001

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    DOI: 10.11408/jjsidre1965.69.71

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  • マルチステップ流出法による不撹乱土壌の不飽和透水係数の推定

    農業土木学会論文集   213:61-68   2001

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  • Regional Characteristics of Stream Water Quality during the Snow-Melting Season in Hokkaido

    Nagumo Toshiyuki, Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   72 ( 1 )   41 - 48   2001

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    The quality of stream water during the snow-melting season results in both beneficial 'spring bloom' and harmful eutrophication. In this study, regional features of total nitrogen and phosphorus, and dissolved-silicate concentraion in stream water during the snow-melting season was characterized by land use and soil conditions in Hokkaido. Total nitrogen and phosphorus concentrations of stream water were below environmental criteria, that is 1 mg L^<-1> and 0.1 mg L^<-1>, respectively, in most areas of Hokkaido. However, the concentrations above those criseria were observed in particular cases such as Funka Bay and the surrounding area in southern Hokkaido, followed by the Tokachi, Kitami and Abashiri areas with upland cropping and livestock husbandry. On the other hand, silicate concentration, which corresponded to soil conditions, was higher in the areas with weathered volcanic-ash soil followed by those less weathered, whereas it was lower in the areas with lowland soils including peat soils. The mol mol^<-1> ratios of silica to total nitrogen or phosphorus concentration (Si/T-N and Si/T-P) of stream water were thought to be useful indicators in judging the effect of eutrophication in the coastal sea during the snow-melting season. Funka Bay and the surrounding area, southern Hokkaido, where both Si/T-N and Si/T-P ratios expressed the condition stimulating flagellates (non-siliceous phytoplankton) and undesirab1e impact had actually been observed, was identified to be most harmful area. It is, therefore, also indicated that the effect of eutrophication in the aquasphere is different due to soil conditions even if there was the same nutrient load.

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  • Effect of Earthworm on Nitrification and Proton Generation of Forest Surface Soils

    Kirikae Machiko, Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   72 ( 6 )   790 - 792   2001

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    DOI: 10.20710/dojo.72.6_790

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  • The Effects of Soil Conditions on Spruce (Picea glehinii) Growth and Nutrient Cycling in Gray Upland Soils and Peat Soils

    Nagata Osamu, Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   72 ( 2 )   147 - 157   2001

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    In order to understand the effects of soil condition on tree growth and nutrient cycling, we monitored the changes in stem diameter and analyzed the nutrient content of current-year needles and leaf litter of Picea glehinii growing in Gray Upland and Peat soils. Stem diameter showed diurnal changes that reflected transpiration and water uptake in both soils. However, the increase in stem diameter was larger in Gray Upland soils than in Peat soils, probably due to the longer growing period of Picea glehinii in the former than in the latter. During a rainy day within the growing period, the average increase in stem diameter was 35 μm d^<-1> in Gray Upland soils and 23 μm d^<-1>in Peat soils. These results suggested that the excessive soil water content in Peat soils weakened the response to rainfall of Picea glehinii. The poor soil water condition in Peat soils was reflected in the minimal growth of Picea glehinii in this soil. Litterfall production in Gray Upland soils was more than twice of that in Peat soils and the C/N ratio of the litterfall in Peat soils was statistically higher than that of Gray Upland soils. The poor soil water condition in Peat soils may have restricted the growth and nutrient uptake of Picea glehinii, which resulted to a low production of litterfall and its high C/N ratio. Results of this study have shown that soil conditions affect tree growth and nutrient cycling.

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  • 軟X線による非破壊土壌中の排水機構の解明

    森 也寸志

    土壌の物理性   83 ( 83 )   59 - 65   2000

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  • Effect of External NH_4^+ on Nitrification of A Horizon Soils in Various Forests

    Kirikae Machiko, Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   71 ( 1 )   63 - 71   2000

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    To evaluate the difference of the H^+ via nitrification among soil types or vegetation types when external NH_4^+ was added to forest soils and to investigate the soil factors that control nitrification, we conducted leaching incubation experiments adding 3 concentrations of NH_4^+ nutrient solutions (0, 5.3, 15.9 mg N L^<-1>) weekly for 6 weeks. Fourteen A horizon samples differed in parent materials and vegetation (deciduous or coniferous). The results btaine are as follows. 1) Nitrification was restrained without NH_4^+ addition, whereas it was promoted with NH_4^+ addition after 6 weeks of incubation. The nitrate product with high-NH_4^+ addition was one to two times higher than that with low-NH_4^+ addition. 2) In four samples (coniferous 3, deciduous 1) with less than 10% Ca saturations, nitrification did not occur even with NH_4^+ addition. 3) Nitrate products were generally higher in the samples from the deciduous forests than the coniferous forests. Samples with shale and serpentinite parent materials had lower nitrification potentials. 4) Judging the properties of nitrification potential from the release of H^+, we identified two pathways of nitrification; one had NH_4^+ as the substrate and the other had organic nitrogen as the substrate. The lower nitrification potential soils leaned on nitrification via organic nitrogen. 5) Results of multiple regression analyse ssuggested that pH_<kcl> and exchangeable Ca^<2+> were contributive to nitrification and the release of H^+ via nitrification.

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  • Pedometrics : Theory and Application : 2. Fractal in the Soil

    Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   71 ( 6 )   914 - 919   2000

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    DOI: 10.20710/dojo.71.6_914

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  • Soft x-ray radiography of drainage patterns of structured soils

    Y Mori, T Maruyama, T Mitsuno

    SOIL SCIENCE SOCIETY OF AMERICA JOURNAL   63 ( 4 )   733 - 740   1999.7

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    Characterization of unsaturated hydraulic and geometrical properties of undisturbed soils is essential for understanding water flow and solute transport in soils. We visualized the drainage pattern by soft x-ray radiography using a contrast medium. Outflow experiments were conducted simultaneously and unsaturated hydraulic conductivity was calculated by parameter estimation. Time sequential drainage patterns were obtained by the subtraction technique, which was done by subtracting a reference image from the image of interest. Drainage patterns of paddy and upland field soils showed that drainage occurs through macropores first, followed by interaggregate macropores, and then finally through the soil matrix. The drainage pattern resembles two-domain flow of macropore and matrix, On the other hand, drainage occurred through the entire sample in forest soils, Unsaturated hydraulic conductivity data showed a discontinuity near saturation, providing evidence of two-domain now. This was explained by differences in bulk density. Tightly packed soils allowed macropore now. The differences increased in the order: forest, upland field, and paddy field soils. An exception was observed in paddy field soils, where roughly parked deeper soils showed significant macropore now. The thin section photograph of paddy field soils from deeper layers revealed that the macropore wall was coated with alluvial materials that prevented smooth water flow across the macropore wall. In this regard, we should also consider the resistance caused by these materials. Soft x-ray radiography of the drainage pattern was helpful in characterizing the unsaturated hydraulic properties of structured soils.

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  • Discriminating the influence of soil texture and management-induced changes in macropore flow using soft X-rays

    Y Mori, K Iwama, T Maruyama, T Mitsuno

    SOIL SCIENCE   164 ( 7 )   467 - 482   1999.7

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    Soft X-ray radiography, a nondestructive technique, was employed to examine macropore now characteristics in soils of different management: paddy, upland field, and forest. A constant-head saturated hydraulic conductivity experiment was conducted using the soft X-ray apparatus. A contrast medium, CH2I2, was applied as a tracer to obtain contrast images of macropore now. The visualization efficiency has been increased by the low-energy system that enables high-contrast images to be obtained as a result of a wider range of mass attenuation coefficients. CH2I2 has a larger attenuation coefficient than bulk soil and has a kinematic viscosity similar to water, It was introduced dropwise to allow movement with the water now. Macropore now was captured using a soft X-ray TV camera, whereas now paths were photographed on X-ray films. Light duralumin, was used for the sample holder instead of the conventionally used stainless steel in order not to cancel the efficiency induced by the contrast medium. We found that the highest resolution obtained was 42.3 mu m This corresponded well to the calculated value of 30 mu m at an energy level of 60 to 70 keV, The resultant images showed that only about 30% of potentially available macropores conducted water now. Macropore now paths were affected by land management: straight isolated cylindrical paths in paddy field soils; a network of tortuous paths in upland field soils; and round cloudy interaggregate paths in forest soils. Macropore now velocity was estimated from CH2I2 movement. Because the now area was restricted to a small number of macropores, the Reynolds number of now ranged from 51.6 to 88.6. The now was in a transition region from laminar to turbulent now. Under actual conditions of macropore now, the assumption of laminar now was not realized, Both structural and dynamic analyses of macropore now explained the now characteristics successfully.

    DOI: 10.1097/00010694-199907000-00003

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  • Soft X-ray visualization and analysis on hydraulic and geometrical properties of soil macropore

    Ph. D. Thesis, Kyoto UniVersity   1999

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  • 軟X線による非破壊土壌中の水移動機構の解明

    ESI-NEWS   17 ( 4 )   129 - 139   1999

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  • The Influence of Acidic Deposition on the Forest Ecosystem and Base Cation Cycling in the Deciduous Broad-Leaved Forest of an Andic Regosol

    Hosobuchi Yukio, Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   70 ( 4 )   505 - 513   1999

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    We investigated the influence of acidic deposition on the forest ecosystem, and base cation cycling related to exchangeable reaction with acid and soil development in a deciduous broad leaved forest of an Andic Regosol in Tomakomai, Hokkaido, Japan. The investigation period was one year from August 1996 to July 1997. The mean pH value of precipitation was 4.13, and it was acid rain. As the water moved through the forest ecosystem, its pH increased. The mean pH value of the streamwater was 7.04. In the summer season, throughfall pH increased with increase of K^+ concentration, while in the winter season, throughfall pH became acidic and similar to the precipitation pH. However, the pH of water percolating through the O horizon was maintained at around 6 all year round. This result showed that the O horizon has sufficient acid neutralization capacity. The concentration of Na^+, Ca^<2+> and HCO_3^- in the streamwater was much higher than that in the C horizon. The HCO_3^-, produced in the deeper horizon, was considered to have a great influence on soil development and streamwater quality. Base cation cycling in the forest ecosystem clearly showed that biogeochemical cycling, which consists of plant uptake, litterfall, throughfall and stemflow flux, was larger than geochemical cycling, which consists of atmospheric deposition and discharge from the rooting zone. In biogeochemical cycling, the acid supplied to the forest ecosystem from the atmosphere was fully neutralized at the canopy by K^+ dissolution and in the O horizon. Proton load in the atmospheric deposition was 0.56 kmol_c ha^<-1> y^<-1>, but only 0.17 kmol_c ha^<-1> y^<-1> was transported into the soil after passing through the canopy, and only a very light proton load of 0.011 kmol_c ha^<-1> y^<-1> occurred from the rooting zone. Proton load from the rooting zone decreased to below 1/70 compared to that in atmospheric deposition. The acid neutralization in the forest ecosystem was formed by base cation leaching from plants and base cation exchange in the soil, and it should be strongly suggested that the acid neutralizing mechanism has an influence on soil-plant interaction.

    DOI: 10.20710/dojo.70.4_505

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  • Methane Emission from Dam-Lake and Methane Uptake by Forest Soil Surrounding the Lake

    Morishita Tomoaki, Hatano Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   70 ( 6 )   791 - 798   1999

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    Methane is one of the greenhouse gasses, having a global warming effect approximately 10 times stronger than CO_2. It is important to identify sources of methane emission and sinks of methane consumption, and to understand their processes. We measured the annual methane emission from a dam-lake and methane consumption by forest soil surrounding the dam-lake, at Morai, Hokkaido, Japan. Methane was continuously emitted from the surface of dam-lake. The methane emission rate increased with the increase of air temperature, from 0.022 mg C m^<-2> h^<-1> in spring to 0.431 mg C m-2 h-1 in fall, followed by a flash of 0.922 mg C m^<-2> h^<-1> in the ice-melting season. The emission rate was significantly correlated with the dissolved methane concentration in the surface water of the dam-lake (r=0.98, n=11). The annual amount of methane emitted from the surface of the dam-lake was estimated as 0.4 Mg C. Methane emission associated with water-discharge from the dam was estimated as 0.43 Mg C by calculation from the data of amount of water discharged from the dam-lake and the difference in concentration between the lake-water and discharged water. Consequently, the total amount of methane emission was 0.83 Mg C, in which 75% occurred during the period of waterdischarge from the dam. Forest soil surrounding the dam-lake always took up methane, even in the snow-covered season. The methane uptake rate increased as soil temperature increased, and there was a decrease of methane concentration in the surface soil, ranging from 0 to 0.1 mg C m-2 h-L Methane uptake during the snow-covered season accounted for 18% of the annual uptake. Taking the watershed area (2050 ha) and dam area (63 ha) into consideration, methane uptake by forest soil surrounding the dam-lake was 10 times larger than the methane emission from the dam-lake. However, the methane uptake rate was about 4 times smaller than the methane emission rate. Therefore, the methane emitted from the dam-lake was not directly consumed by the forest soil surrounding the dam-lake.

    DOI: 10.20710/dojo.70.6_791

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  • 被覆肥料を用いた畑地からの窒素負荷の流出削減-傾斜ライシメータからの汚濁負荷流出に関する研究((]G0001[))-(共著)

    農業土木学会論文集   198   13 - 21   1998

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  • 畑地からのリンとCOD成分の表面流出-傾斜ライシメータからの汚濁負荷流出に関する研究((]G0002[))-(共著)

    農業土木学会論文集   198   23 - 29   1998

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  • Structural Analysis on Soil Macropores using Fourier Transform

    Yasushi Mori,Watanabe Tsugihiro,Maruyama Toshisuke

    Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering   ( 187 )   49 - 57   1997

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    DOI: 10.11408/jsidre1965.1997.49

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  • 斐伊川から宍道湖へ流出する汚濁負荷量の推定(共著)

    LAGUNA   3   91 - 96   1996

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  • Formation and Morphology of Root Created Macropore in Paddy Field

    Yasushi Mori,Tsugihiro Watanabe,Toshisuke Maruyama

    Transctions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering   ( 171 )   13 - 20   1994

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    DOI: 10.11408/jsidre1965.1994.171_13

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  • 土地利用による土壌間隙構造の差異-軟X線による観察を中心にして-

    Journal of the Japanese Society of Soil Physics   ( 66 )   19 - 27   1992

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  • Differences in Soil Structure with Land-use, Observations Using Soft X-Ray

    Soil Physical Conditions and Plant Growth, Japan   ( 66 )   19 - 27   1992

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  • Analysis of Inorganic Anions in Soil Solutions by Indirect Photometric Ion Chromatography

    AOYAMA Masakazu

    Japanese Journal of Soil Science and Plant Nutrition   63 ( 5 )   597 - 601   1992

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    DOI: 10.20710/dojo.63.5_597

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  • Accumulated Organic Matter and Its Nitrogen Mineralization in Soil Particle Size Fractions with Long-Term Application of Farmyard Manure or Compost

    AOYAMA Masakazu

    Japanese Journal of Soil Science and Plant Nutrition   63 ( 2 )   161 - 168   1992

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    Soils applied with different rates of farmyard manure (FYM) or compost were fractionated according to the particle size and the amounts of total C and N, mineralized N during 4 weeks of incubation at 30℃ and muramic acid were analyzed in each fraction. The soils used were sampled from three experimental fields in Japan : Togo (Red-Yellow soil ), applied with FYM at the rate of 0 to 20t/10 a for 8 years ; Kuriyagawa (Ando soil), applied with FYM at the rate of 0 to 32t/10 a for 10 years ; Fujisaka (Ando soil), applied with compost at the rate of 0 to 3.4t/10 a for 43 years. The long-term application of FYM or compost increased the total carbon and nitrogen contents of each particle size fraction, and the relative increase in the amount of organic matter was largest in coarse sand size fraction (>210 μm). The increase in organic matter in coarse sand size fraction due to the organic matter application was remarkable in the soils that received a large amount of FYM, i. e., from Togo and Kuriyagawa. The application of organic matter also increased the amount of mineralizable organic N in each fraction, and the percentage mineralization of organic N was the largest in coarse sand size and clay size (<2 μm) fractions of the soils applied with organic matter. From the distribution of mineralizable N among the particle size fractions, the most important fraction contributing to the N mineralization was the coarse sand size fraction for the Red-Yellow soil whereas the clay size fraction for the Ando soil. The concentration of muramic acid in particle size fractions increased with the increase of the amount of applied organic matter except for the coarse sand size and fine sand size (20-210 μm) fractions of soils from Fujisaka. Significant correlations between the concentrations of muramic acid and the amounts of mineralized N in individual fractions were observed with exception of the fine sand size fraction of the Ando soils. This finding suggested that the microbial cell wall materials were serving as a source of readily mineralizable N in soils applied with organic matter.

    DOI: 10.20710/dojo.63.2_161

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  • The effect of pH on the transformation of nitrite in the soil of tea field.

    HAYATSU Masahito

    Chagyo Kenkyu Hokoku (Tea Research Journal)   1990 ( 72 )   27 - 32   1990

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    Language:Japanese   Publisher:Japanese Society of Tea Science and Technology  

    The present study was designated to evaluate the process of nitrite transformation in the soil of tea field, employing a soil suspended liquid culture.<BR>Soil samples were collected from fields of three different conditions of fertilization, control, nitrogen rich and calucium rich. The pHs of soil samples was 2.9, 3.9, 5.2 and their nitrification activity, nitrate production from added ammonium salufate, was 10, 20 and 34.3mgN/ 100g of dried soil/week respectively.<BR>Autotrophic nitrite oxidizer media adjusted to pH 3.5, 5.5 or 7.5 were inoculated untreated soil, steam-sterilized soil or NaClO3 treated soil. The high activity of nitrite oxidizing bacteria were observed in soil samples of pH 3.9 and 5.2 when the media of pH7.5 was inoculated untreated soil. In the soil of pH2.9, the activity could not be observed in the all of tested media though nitrate production rate measured by soil incubation was high in spite of strongly acidic soil condition. These result indicated a posibility that the acid tolerant microbial nitrite oxidation and/or chemical nitrification occure in acid soil of tea field.

    DOI: 10.5979/cha.1990.72_27

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  • Theory and Practice of Ion Chromatography (2) Application to Soils and Plants

    HATANO Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   57 ( 5 )   518 - 520   1986

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    DOI: 10.20710/dojo.57.5_518

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  • Theory and Practice of Ion Chromatography. (1). Basic Theory

    HATANO Ryusuke

    Japanese Journal of Soil Science and Plant Nutrition   57 ( 4 )   421 - 424   1986

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    DOI: 10.20710/dojo.57.4_421

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Books

  • "First Step in Conservation and Restoration" in A BANAUE STORY Restoring a World Heritage Treasure

    Yasushi.Mori, Kumiko.Tsujimoto( Role: Joint author)

    Universal Harvester  2018.7 

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  • A BANAUE STORY Restoring a World Heritage Treasure

    Mori,Y, K.Tsujimoto( Role: Joint author ,  "First Step in Conservation and Restoration")

    Universal Harvester  2018.4 

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  • 環境の管理・修復と地域資源の活用

    森 也寸志( Role: Joint editor)

    千鳥印刷株式会社  2011.8 

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  • 環境の管理・修復と地域資源の活用-持続可能な地域社会の構築に向けて-

    Yasushi Mori,Kenji Taniguchi,Tsuguhiro Nonaka( Role: Joint author)

    2011.8 

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  • Soft X-ray radiography of structure-induced macropore flow in clayey soils

    森 也寸志( Role: Joint author)

    Clay Science for Engineering, Balkema, Rotterdam  2001 

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  • X線ハンドブック

    森 也寸志,辻本 忠ら( Role: Joint author ,  X線の農生物への利用)

    電子科学研究所  1997 

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MISC

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Presentations

  • 有機物と乾湿の繰り返しを与えたマサ土における初期団粒形成の検証

    井原 崚貴, 森 也寸志

    土壌物理学会  2021.10.30 

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    Event date: 2021.10.30

    Language:Japanese   Presentation type:Poster presentation  

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  • 不耕起栽培とマクロポア導入から見る表層土壌の保水と有機質化のプロセス

    森也寸志, 岡 香菜子, Bui Thanh Long

    土壌物理学会  2021.10.30 

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    Event date: 2021.10.30

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  • 少量の土壌試料から飽和透水係数を得る方法の提案

    小堀壮真, 森 也寸志

    土壌物理学会  2021.10.30 

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    Event date: 2021.10.30

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  • Water and Mass Transfer in Soils and Optimal Farmland Management in the Rice Terraces of the Philippine Cordillera

    Tomoyo Kurozumi, Yasushi Mori, Hiroaki Somura, Pearl Basilio Sanchez, Gina Villegas-Pangga

    Japan Geophysical Union Annual meeting  2021.6.3 

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    Event date: 2021.5.30 - 2021.6.6

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  • Effect of the gravity differences on early stage water movement in soils

    Ryoki Ihara, Yasushi Mori

    Japan Geophysical Union Annual meeting  2021.6.3 

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    Event date: 2021.5.30 - 2021.6.5

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  • Impact of Macropore Structure and Water Management on Greenhouse Gas Emissions, Total Soil Carbon and Nitrogen, and Soil Mineral Distribution in Agricultural Field

    Bui Thanh Long, Yasushi Mori, Morihiro Maeda

    Japan Geophysical Union Annual meeting  2021.6.3 

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    Event date: 2021.5.30 - 2021.6.5

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  • Neural network estimation of soil organic matter contents and its relation to other soil components

    Masaki Kiyohiro, Yasushi Mori, Takayuki Shuku

    Japan Geophysical Union Annual meeting  2021.6.3 

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    Event date: 2021.5.30 - 2021.6.5

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  • Soil Moisture Estimation Using Amplitude Change of Low-Cost GPS Receiver International conference

    Yasushi Mori, Tadaomi Saito, Kosuke Noborio

    米国土壌科学学会 

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    Event date: 2020.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Efficient and Sustainable Rice Farming and Land Management with the Assessment of Local Farmers' Perception and Knowledge in the Rice Terraces of the Philippines Cordilleras International conference

    Tomoyo Kurozumi,Yasushi Mor,Hiroaki Somur,Milagros Ong How,Pearl Basilio Sanchez

    米国土壌科学学会 

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    Event date: 2020.11

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  • Greenhouse Gases Emissions and Total Carbon Contents in Agricultural Soils Affected By Macropore Structures International conference

    BT Long,Yasushi Mori

    米国土壌科学学会 

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    Event date: 2020.11

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  • 棚田における有機物目詰まりによるガス発生と耕盤形成不全の可能性

    森 也寸志, 橿 真由香, 黒住知代, 宗村広昭, Milagros O. How

    土壌物理学会 

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    Event date: 2020.10

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  • ニューラルネットワークによる土壌有機物推定と土壌構成要素の相関推定

    清広 真輝,森 也寸志,開田行美

    土壌物理学会 

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    Event date: 2020.10

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  • 土壌有機物によるガスの発生が棚田耕盤の形成と安定に及ぼす影響

    森 也寸志, 橿 真由香, 黒住知代, 宗村広昭, Milagros O. How

    土壌肥料学会 

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    Event date: 2020.9

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  • フィリピン・コルディリェーラの棚田群における土壌環境改善のための農法と農地管理の提案

    黒住 知代, 森 也寸志, 宗村広昭, Milagros Ong How, Pearl Basilio Sanchez

    土壌肥料学会 

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  • Soil moisture estimation using low-cost GPS multipath receiver International conference

    Japan Geoscience Union MEETING2020 

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    Event date: 2020.7

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  • Assessment of Soil Quality as Affected by Topography and Farming Practices in the Rice Terraces in Ifugao, the Philippines International conference

    Japan Geoscience Union MEETING2020 

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    Event date: 2020.7

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  • Estimation of correlation between soil organic matter and soil components using neural network International conference

    Japan Geoscience Union MEETING2020 

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  • Effects of Macropore Structures on Agricultural Soil's Greenhouse Gases Emission International conference

    Japan Geoscience Union MEETING2020 

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    Event date: 2020.7

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  • The Effect of Pore Structure on Water Infiltration under Different Gravity International conference

    Japan Geoscience Union MEETING2020 

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  • The effect of gas emission from organic matter on the stability of rice terraces structure International conference

    Japan Geoscience Union MEETING2020 

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  • The Effect of Artificial Macropores on the Amount of Organic Matter in Soils and Plant Biomass. International conference

    Yasushi Mori

    EGU General Assembly 2020 

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  • フィリピン・コルディリェーラの棚田群の保全に関わる土壌環境因子の影響 International conference

    Tomoyo Kurozumi,Yasushi Mori,Hiroaki Somura

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • 重力の異なる惑星下における浸透現象 International conference

    Yasushi Mori

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • 線状型マイクロポア導入による表面流出の削減効果 International conference

    Masaki Kiyohiro,Yasushi Mori,Kazutoshi Osawa,Akira Hoshikawa

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • Characterizing Soil Environment in The Rice Terraces of the Philippine Cordilleras International conference

    Tomoyo Kurozumi, Yasushi Mori, Hiroaki Somura, Milagros Ong How

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • Unsaturated Hydraulic Conductivity Estimation from Multi-step Centrifuge Outflow International conference

    Thanh Long Bui, Yasushi Mori

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • 畑地における溝切りと作物残渣の挿入が雨水の浸入と土壌浸食に及ぼす影響 International conference

    Kazutoshi Osawa,Yasushi Mori,Akira Hoshikawa

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • ニューラルネットワークを用いた土壌表層の有機炭素量の予測 International conference

    Ikumi Kaida,Yasushi Mori,Takayuki Syuku

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • コルディリェーラの棚田における水・物質動態のモデル化に向けた予備調査 International conference

    Hiroaki Somura,Yasushi Mori,Tomoyo Kurozumi

    Japan Geoscience Union MEETING2019 

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    Event date: 2019.5.26 - 2019.5.30

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  • WHEN DO RICE TERRACES BECOME RICE TERRACES? International conference

    Y. Mori, M. Sasaki, E. Morioka, K. Tsujimoto

    International Society of Paddy and Water Environment Engineering (PAWEES) 

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    Event date: 2018.11

    Language:English   Presentation type:Poster presentation  

    Venue:Nara,Japan  

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  • 線状型マイクロポアを用いたサトウキビ畑からの土壌流棒抑制に対する最適管理

    Eisei Morioka, Yasushi Mori

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    Event date: 2018.10.27

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  • 線状型マクロポア導入による国頭マージの表面流出の削減効果

    Masaki Kiyohiro, Yasushi Mori

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    Event date: 2018.10.27

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  • FTIRを用いた土壌有機物の特徴抽出と含有量推定

    Masayoshi Iwasaki, Yasushi Mori

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    Event date: 2018.10.27

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  • 岡山県及び広島県における農地被害の特徴報告

    森也寸志・森岡瑛世 諸泉利嗣・前田守弘・宗村広昭

    農業農村工学会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都  

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  • 棚田の保全と復興に関わる土壌環境の変化 International conference

    Japan Geoscience Union MEETING2018 

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    Event date: 2018.5.20 - 2018.5.24

    Presentation type:Poster presentation  

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  • Linear-Macropore Installation for ReducingRed-Soil Erosion at Sugarcane Field -Column experiment toward field application- International conference

    Eise Morioka,Yasushi Mori

    Japan Geoscience Union MEETING 2018 

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    Event date: 2018.5.20 - 2018.5.24

    Language:English   Presentation type:Poster presentation  

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  • Centrifuge method for measuring water retention properties of soils with small volume samples. International conference

    Yasushi Mori

    Japan Geoscience Union MEETING 2018 

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    Event date: 2018.5.20 - 2018.5.24

    Language:English   Presentation type:Poster presentation  

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  • 衛星搭載マイクロ波放射計を利用した土壌水分量推定に向けた土壌誘電率のモデル化

    Kumiko Tsujimoto, Yasushi Mori

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    Event date: 2017.10.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 線状型マクロポア導入によるサトウキビ畑からの流亡削減

    Eisei Morioka, Yasushi Mori, Kazutoshi Osawa, Akira Hoshikawa

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    Event date: 2017.10.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 不耕起栽培と線状型マクロポアを用いた沖縄県石垣島における赤土流出抑制対策

    Kanako Oka, Yasushi Mori, Kazutoshi Osawa, Akira Hoshikawa

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    Event date: 2017.10.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 衛星データによる気候変動下の農業環境情報の取得とその利用

    Yasushi Mori

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    Event date: 2017.8.29 - 2017.8.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 科研費申請時の留意事項

    Yasushi Mori

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    Event date: 2017.8.29 - 2017.8.31

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Soil carbon accumulation process as Affected by infiltrtion pattern International conference

    Yasushi Mori,Aya Nakayama

    Japan Geoscience Union MEETING 2017 

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    Event date: 2017.5.22 - 2017.5.25

    Language:English   Presentation type:Poster presentation  

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  • Effects of Linear Macropore Installation in Subtropical Soil to Reduce Surface Flow at Sugarcane Field International conference

    Kanako Oka,Yasushi Mori

    Japan Geoscience Union MEETING 2017 

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    Event date: 2017.5.22 - 2017.5.25

    Language:English   Presentation type:Poster presentation  

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  • Effects of glucose addition on FDA Activity and soil hydraulic properties International conference

    Jumpei Fukumasu,Yasushi Mori

    Japan Geoscience Union MEETING 2017 

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    Event date: 2017.5.22 - 2017.5.25

    Language:English   Presentation type:Poster presentation  

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  • 人工マクロポアの導入が土壌有機物の損失に与える影響 International conference

    Yasushi Mori,Maaya Shimoi,Nobuhiro Kaneko,Kouichi Fujie

    Japan Geoscience Union MEETING 2017 

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    Event date: 2017.5.22 - 2017.5.25

    Language:Japanese   Presentation type:Poster presentation  

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  • ブルーベリー栽培環境を対象とした人工マクロポアを用いた放射性セシウムの下方浸透促進効果 International conference

    Yasushi Mori,Masahiro Hayashi,Eiko Inao,Kousuke Noborio

    Japan Geoscience Union MEETING 2017 

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    Event date: 2017.5.22 - 2017.5.25

    Language:Japanese   Presentation type:Poster presentation  

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  • How Does Soil Macro-Aggregation Impact on Enzyme Activity and Nitrogen Mineralization? International conference

    Jumpei Fukumasu, Liz J Shaw, Yasushi Mori

    ASA・CSSA・SSSA 2016  ASA・CSSA・SSSA

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    Event date: 2016.11.7 - 2016.11.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:アメリカ合衆国アリゾナ州フェニックス フェニックスコンベンションセンター  

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  • Fixing Radio-Cesium(Cs-137) in Soil with Vermiculite in Fukushima International conference

    Yuki Takagi, Kosuke Noborio, Yasushi Mori

    ASA・CSSA・SSSA 2016  ASA・CSSA・SSSA

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    Event date: 2016.11.7 - 2016.11.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:アメリカ合衆国アリゾナ州フェニックス フェニックスコンベンションセンター  

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  • Effect of Artificial Macropore Installation in Subtropical Soils to Reduce Surface Flow at Sugarcane Field International conference

    Yasushi Mori

    ASA・CSSA・SSSA 2016  ASA・CSSA・SSSA

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    Event date: 2016.11.7 - 2016.11.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:アメリカ合衆国アリゾナ州フェニックス フェニックスコンベンションセンター  

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  • 人工マクロポアを利用した下方浸透促進による土壌・植生環境の修復と有機貯留 International conference

    福桝純平、Show Liz、森 也寸志

    ASA・CSSA・SSSA 2016  ASA・CSSA・SSSA

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    Event date: 2016.11.7 - 2016.11.9

    Language:English   Presentation type:Poster presentation  

    Venue:アメリカ合衆国アリゾナ州フェニックス フェニックスコンベンションセンター  

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  • 土壌のマクロ団粒が酵素による土壌有機窒素の加水分解に及ぼす影響

    福桝純平、Show Liz、森 也寸志

    2016年度土壌物理学会大会  土壌物理学会

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    Event date: 2016.10.28 - 2016.10.30

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都市 京都大学吉田キャンパス農学部総合館  

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  • ブルーベリーポットでの放射性セシウムの人工マクロポアによる移動効果

    林 匡紘、森 也寸志、稲生栄子

    2016年度土壌物理学会大会  土壌物理学会

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    Event date: 2016.10.28 - 2016.10.30

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都市 京都大学吉田キャンパス農学部総合館  

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  • 不耕起栽培と線状型マクロポアを用いた沖縄県石垣島における赤土流出浴せ対策

    岡香菜子、森 也寸志、大澤和政、干川 明

    2016年度土壌物理学会大会  土壌物理学会

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    Event date: 2016.10.28 - 2016.10.30

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都市 京都大学吉田キャンパス農学部総合館  

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  • 乾燥地灌漑農業地域における砂丘地に隣接した煙害の植生変化

    前川健太朗、赤江剛夫、守田秀則、森 也寸志、史海濱

    2016年度土壌物理学会大会  土壌物理学会

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    Event date: 2016.10.28 - 2016.10.30

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都市 京都大学吉田キャンパス農学部総合館  

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  • Effect of Artificial Macropore Installation in Subtropical Soils to Reduce Surface Flow at Sugarcane Field International conference

    Japan Geoscience Union MEETING 2016 

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    Event date: 2016.5.22 - 2016.5.25

    Language:English   Presentation type:Oral presentation (general)  

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  • Artificial macropore effects on carbon storage in soils International conference

    Japan Geoscience Union MEETING 2016 

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    Event date: 2016.5.22 - 2016.5.25

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  • Evaluation of Groundwater Recharge in a Sand Dune for the Arid Land Irrigation Agriculture International conference

    Japan Geoscience Union MEETING 2016 

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    Event date: 2016.5.22 - 2016.5.25

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  • Installing Artificial Macropore in Blueberry Pot to Enhance Vertical Infiltration and Fix Radioactive Cesium International conference

    Japan Geoscience Union MEETING 2016 

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    Event date: 2016.5.22 - 2016.5.25

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  • How important is soil aggregation in regulating the activity ofenzymes involved in the depolymerization of soil organic nitrogen? International conference

    Japan Geoscience Union MEETING 2016 

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    Event date: 2016.5.22 - 2016.5.25

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 不耕起栽培が熱帯サトウキビ畑の物理性の保存に及ぼす効果-疑似団粒を用いた耕起・不耕起栽培における雨水浸透特性の検討- International conference

    Japan Geoscience Union MEETING 2016 

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    Event date: 2016.5.22 - 2016.5.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 土壌マクロポアによるセシウムの移動

    森 也寸志

    明治大学科学技術研究所シンポジウム  明治大学農学部農学科土地資源学研究室

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    Event date: 2015.12.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:明治大学生田キャンパス農学部  

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  • 人工マクロポアが土壌中の有機物量に与える影響

    森 也寸志

    土壌物理学会大会講演会,2015  土壌物理学会

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    Event date: 2015.10.24 - 2015.10.25

    Language:Japanese   Presentation type:Poster presentation  

    Venue:佐賀県佐賀市 佐賀大学本庄キャンパス  

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  • 不耕起栽培が熱帯サトウキビ畑の物理性の回復に及ぼす効果

    森 也寸志・荒井見和・Swibawa Gede・Niswati Ainin・金子信博・藤江幸一

    土壌物理学会  土壌物理学会

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    Event date: 2015.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 人工マクロポアの溶質移動促進による炭素貯留効果

    守分秀一・森也寸志・赤江剛夫

    土壌物理学会  土壌物理学会

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    Event date: 2015.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 人工マクロポアの効果に及ぼす初期水分量の影響

    ?川和起・森 也寸志・諸泉利嗣

    土壌物理学会  土壌物理学会

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    Event date: 2015.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 異なる土性に応じた人工マクロポアの効果

    ?川和起・森 也寸志・諸泉利嗣

    農業農村工学会大会講演会  農業農村工学会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 乾燥地灌漑農業地域における砂丘地の水分動態

    前川健太朗・赤江剛夫・守田秀則・史 海濱・森 也寸志

    農業農村工学会大会講演会  農業農村工学会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 人工マクロポアを用いた放射性Csの下方浸透と固定

    林 匡紘・森 也寸志・稲尾栄子・登尾浩助

    農業農村工学会大会講演会  農業農村工学会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 人工マクロポアの導入が土壌中の有機物に与える変化

    守分秀一・那須遥子・森 也寸志・赤江剛夫

    農業農村工学会大会講演会  農業農村工学会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of the initial water content in effect of artificial macropore International conference

    Kazuki Sakikawa,Yasushi Mori,Toshitsugu Moroizumi

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    Event date: 2015.5.24 - 2015.5.28

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Artifical Macropore in stallation effect on corbon storage International conference

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    Event date: 2015.5.24 - 2015.5.28

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • The Effect of Artificial Macropores on the Amount of Organic Matters in Soils and Plant Biomass International conference

    MORI Yasushi, YAMAMOTO Tetsuya, FUJIHARA Atsushi

    Japan GeoScience Union  Japan GeoScience Union

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

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  • 人工団粒と人工マクロポアを使った強雨後の土壌水分プロファイルの基礎的検討

    森也寸志; ?川和起, 冨士和哉, 荒井見和, 金子信博, 藤江幸一

    日本地球惑星科学連合  日本地球惑星科学連合

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    Event date: 2015.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Measuring Fresh and Old Organic Matter Contents in Degraded Soils using FTIR spectroscopy International conference

    Moriwake Shuichi, Yoko Nasu, Yasushi Mori

    Japan GeoScience Union  Japan GeoScience Union

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

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  • Assessment of enhanced infiltration by artificial macropore with HYDRUS-2D International conference

    Kazuki Sakikawa, Yasushi Mori, Toshitsugu Moroizumi

    Japan GeoScience Union  Japan GeoScience Union

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

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  • 下方浸透促進によ る地表の放射性物質削減と根群域回避の試み-廃棄土壌を伴わない放射線量低減技術2-

    Yasushi Mori,Naoki Sato,Tamami Miyamoto,Eiko Inao,Kousuke Noborio

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    Event date: 2014.10.26

    Language:Japanese   Presentation type:Poster presentation  

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  • 人工マクロポアが土壌中の有機物量に与える影響

    森 也寸志,

    土壌物理学会大会講演会,2014  土壌物理学会

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    Event date: 2014.10.26

    Language:Japanese   Presentation type:Poster presentation  

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  • HYDRUS-2Dを用いた人工マクロポアによ る降雨浸透促進効果の評価

    森 也寸志,

    土壌物理学会大会講演会,2014  土壌物理学会

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    Event date: 2014.10.26

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福島県福島市  

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  • インドネシア・サトウキビ圃場における農地管理が耐水性団粒と土壌炭素貯留に与える影響

    森 也寸志,

    日本土壌肥料学会2014年度大会講演会  日本土壌肥料学会

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    Event date: 2014.9.9 - 2014.9.11

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京都小金井市 渡橋農工大学小金井キャンパス  

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  • Short term effect of no-tillage and bagasse mulching on soil carbon through modification of water stable aggregate under sugarcane field in Lampung Province International conference

    Yasushi Mori,

    First Global Soil Biodiversity Conference  First Global Soil Biodiversity Conference

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    Event date: 2014.5.19 - 2014.5.23

    Language:English   Presentation type:Poster presentation  

    Venue:Sumatra, Indonesia  

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  • Artificial Macropore Installation in Degraded Soils for Enhancing Infiltration to Restore Soil Environment International conference

    Yasushi Mori,

    ASA-CSA-SSSA International Annual Meeting 2014 

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    Event date: 2014.5.19 - 2014.5.23

    Language:English   Presentation type:Poster presentation  

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  • Enhancing Radioactive Fallout Removal from the Surface Soils by using artficial macropore transport system International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2014.4.28 - 2014.5.1

    Language:English   Presentation type:Poster presentation  

    Venue:Yokohama, Japan  

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  • Artificial Macropore Installation in Degraded Soils for Enhancing Vertical Infiltration to Restore Soil Environment International conference

    Yasushi Mori,

    World Congress of Soil Science  World Congress of Soil Science

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    Event date: 2014.4.28 - 2014.5.1

    Language:English   Presentation type:Poster presentation  

    Venue:Yokohama, Japan  

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  • 不耕紀栽培が熱帯サトウキビ畑の物理性の回復に及ぼす影響 International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2014.4.28 - 2014.5.1

    Language:English   Presentation type:Poster presentation  

    Venue:Yokohama, Japan  

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  • Artificial Macropore installation effect on organic matter storage at a degraded land International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2014.4.28 - 2014.5.1

    Language:English   Presentation type:Poster presentation  

    Venue:Yokohama, Japan  

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  • A Design of Artificial Macropore for Improving Infiltration Process in Degraded Soils International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2014.4.28 - 2014.5.1

    Language:English   Presentation type:Poster presentation  

    Venue:Yokohama, Japan  

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  • インドネシア・サトウキビプランテーションにおける農地管理が土壌炭素貯留に及ぼす影響-耐水性団粒と炭素・窒素安定同位体比を用いた解析-

    森 也寸志

    日本生態学会  日本生態学会

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    Event date: 2014.3.18

    Language:Japanese   Presentation type:Poster presentation  

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  • 異なる農地管理が耐水性団粒画分の土壌炭素と安定同位体に及ぼす影響

    森 也寸志

    同位体環境学シンポジウム  同位体環境学シンポジウム

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    Event date: 2013.12.17 - 2013.12.18

    Language:Japanese   Presentation type:Poster presentation  

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  • Radioactive Fallout Removal From the Surface Soils By Enhancing Vertical Transport With Artificial Macropores International conference

    Yasushi Mori

    ASA-CSA-SSSA International Annual Meeting  American Society of Agronomy

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    Event date: 2013.11.13 - 2013.11.16

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tampa, Fl. USA  

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  • Enhancing Vertical Infiltration By Artificial Macropores for Increasing Biomass in Degraded Soils International conference

    Yasushi Mori

    ASA-CSA-SSSA International Annual Meeting  American Society of Agronomy

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    Event date: 2013.11.13 - 2013.11.16

    Language:English   Presentation type:Poster presentation  

    Venue:Tampa, Fl. USA  

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  • 下方浸透促進による地表からの放射性降下物削減の試み

    森 也寸志

    土壌物理学会大会講演会,2013  土壌物理学会

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    Event date: 2013.10.26

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福島県福島市  

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  • 真砂に含まれる雲母様粒子に吸着するセシウム分布のSEM/EDXによる観察

    森 也寸志

    土壌物理学会大会講演会,2013  土壌物理学会

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    Event date: 2013.10.26

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福島県福島市  

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  • 自然の土壌間隙の構造解明と劣化土壌環境の修復技術について Invited

    森 也寸志

    土壌肥料学会シンポジウム「土壌団粒構造と土壌プロセス」  土壌肥料学会

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    Event date: 2013.9.11 - 2013.9.13

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋市  

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  • 土壌炭素放出のプライミング効果におけるマクロポアの役割

    森 也寸志

    土壌肥料学会,2013  土壌肥料学会

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    Event date: 2013.9.11 - 2013.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋市  

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  • 人工マクロポアを利用した下方浸透の促進と有機物貯留による劣化土壌の修復

    森 也寸志

    土壌肥料学会,2013  土壌肥料学会

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    Event date: 2013.9.11 - 2013.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋市  

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  • Enhancing Infiltration and Carbon Storage in Soils by Artificial Macropore Systems Invited

    森 也寸志

    National Taiwan University Seminar 2013  Okayama University

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    Event date: 2013.5.22

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Artificial macropore installation effect on plant biomass amount at a degraded land International conference

    Yasushi Mori

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2013.5.19 - 2013.5.23

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • Radioactive fallout removal from the surface soils by enhancing vertical transport International conference

    Yasushi Mori

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2013.5.19 - 2013.5.23

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • Radioactive fallout removal from the surface soils by enhancing vertical transport International conference

    Yasushi Mori

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2013.5.19 - 2013.5.23

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • The Effect of Artificial Macropores on the Amount of Organic Matters in Soils and Plant Biomass International conference

    Yasushi Mori

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2013.5.19 - 2013.5.23

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • FIRSTシンポジウム「科学技術が拓く2030年」

    森 也寸志

    FIRSTシンポジウム「科学技術が拓く2030年」  内閣府

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    Event date: 2013.2.28

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京都新宿区 ベルサール新宿グランド  

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  • Modeling analysis of land-use impact against water qualities in Hii River basin International conference

    Yasushi Mori

    American Geophysical Union Fall Meeting  American Geophysical Union

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    Event date: 2012.12.3 - 2012.12.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco, CA, USA  

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  • Effects of hydrophilic macropore fillings and coatings on the infiltration into water repellent porous media International conference

    Yasushi Mori

    American Geophysical Union Fall Meeting  American Geophysical Union

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    Event date: 2012.12.3 - 2012.12.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco, CA, USA  

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  • Enhancing Bioremediation of Oil-contaminated Soils by Controlling Nutrient Dispersion using Dual Characteristics of Soil Pore Structure International conference

    Yasushi Mori,

    American Geophysical Union Fall Meeting  American Geophysical Union

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    Event date: 2012.12.3 - 2012.12.7

    Language:English   Presentation type:Poster presentation  

    Venue:San Francisco, CA, USA  

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  • 人工マクロポアによる表層クラストの影響軽減と水分貯留の促進

    森 也寸志,

    土壌物理学会大会講演会  土壌物理学会

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    Event date: 2012.11.2

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 人工マクロポアを通じた有機物の土壌深部への輸送効果について

    森 也寸志,

    土壌物理学会大会講演会  土壌物理学会

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    Event date: 2012.11.2

    Language:Japanese   Presentation type:Poster presentation  

    Venue:北海道帯広市  

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  • 人工マクロポアが土壌中の有機物量に及ぼす影響

    森 也寸志,

    土壌物理学会大会講演会  土壌物理学会

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    Event date: 2012.11.2

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 排水不良果樹園における放射性物質の分布特性と下方浸透促進の試み

    森 也寸志,

    土壌物理学会大会講演会  土壌物理学会

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    Event date: 2012.11.2

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Effective Vertical Solute Transport in Soils by Artificial Macropores International conference

    Yasushi Mori

    ASA-CSA-SSSA International Annual Meeting 

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    Event date: 2012.10.21 - 2012.10.24

    Language:English   Presentation type:Oral presentation (general)  

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  • 人工マクロポアを使った土壌水下方浸透の促進による劣化土壌環境の修復 Invited

    森 也寸志

    宮城県農業・園芸総合研究所スキルアップセミナー  土壌物理学会

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    Event date: 2012.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:宮城県農業・園芸総合研究所  

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  • Enhancing water infiltration and water-holding in soils by macropore system International conference

    Yasushi Mori

    Japan Geoscience Union Meeting 

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    Event date: 2012.5.19 - 2012.5.25

    Language:English   Presentation type:Oral presentation (general)  

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  • Grain size analysis by laser diffraction particle size analyzer International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2012.5.19 - 2012.5.25

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • The effect of artificial macropores on the amount of organic matters in soil International conference

    Yasushi Mori

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2012.5.19 - 2012.5.25

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • Evaluation of management practices in agricultural and forest lands by the multiple-frequency electromagnetic surveying system International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2012.5.19 - 2012.5.25

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • Numerical simulation of wetting zones generated by artificial macropores International conference

    Yasushi Mori,

    Japan Geoscience Union Meeting  Japan Geoscience Union

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    Event date: 2012.5.19 - 2012.5.25

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba, Japan  

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  • EM sounding characterization of soil environment toward estimation of potential nonpoint pollution sources International conference

    Yasushi Mori

    Japan Geoscience Union Meeting 

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    Event date: 2012.5.19 - 2012.5.25

    Language:English   Presentation type:Oral presentation (general)  

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  • 健全な水源林の管理について Invited

    森 也寸志,米 康充,宗村広昭,高橋絵里奈

    持続可能な水・土・里 in 雲南 

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    Event date: 2012.3.15

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 人工マクロポアによる連続的な土壌水下方浸透の促進

    森也寸志・末継淳・山本哲也

    土壌物理学会大会 

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    Event date: 2011.10.28

    Language:Japanese   Presentation type:Poster presentation  

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  • Hydrus2Dによる人工マクロポア設置土壌中の水分分布シミュレーション

    末継淳・森也寸志

    土壌物理学会大会 

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    Event date: 2011.10.28

    Language:Japanese   Presentation type:Poster presentation  

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  • 人工マクロポアが土壌中の下方浸透に及ぼす影響

    山本哲也・森也寸志・森澤太平

    土壌物理学会大会 

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    Event date: 2011.10.28

    Language:Japanese   Presentation type:Poster presentation  

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  • 多周波数電磁探査法による農林地の土壌環境管理の評価.

    宮本珠未・川原まどか・森也寸志

    土壌物理学会大会 

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    Event date: 2011.10.28

    Language:Japanese   Presentation type:Poster presentation  

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  • 多周波数電磁探査法で推測する土壌を通じた水質形成過程

    川原まどか・宮本珠未・大西政夫・森也寸志

    土壌物理学会大会 

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    Event date: 2011.10.28

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  • 土壌中の有機物が土壌の団粒に及ぼす影響

    森澤太平・森也寸志・金子信博

    土壌物理学会大会 

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    Event date: 2011.10.28

    Language:Japanese   Presentation type:Poster presentation  

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  • Enhancing Bioremediation for Oil-contaminated Soils by Controlling Nutrient Dispersion using Dual Characteristics of Soil Pore Structure Invited International conference

    Yasushi Mori

    The 15th Conference of Agroeology in China 

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    Event date: 2011.7.29 - 2011.7.31

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 地球陸域の最表層を覆う環境資源「土壌」へのいざない Invited

    森 也寸志

    松江東高等学校 科学技術セミナー 

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    Event date: 2011.7.21

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 地球陸域の最表層を覆う環境資源「土壌」へのいざない Invited

    森 也寸志

    島根大学教育学部附属中学校・特別理科 

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    Event date: 2011.7.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Enhancing Infiltration and Carbon Storage in Soils by Artificial Macropore Systems International conference

    Yasushi Mori, Tetsuya Yamamoto and Atsushi Fujihara

    Japan Geoscience Union Meeting 

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    Event date: 2011.5.22 - 2011.5.27

    Language:English   Presentation type:Poster presentation  

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  • 西日本の中山間地域における河川水の硝酸濃度と土地利用との関係について:安定同位体を用いた解析 International conference

    井手淳一郎, 宗村広昭, 中村高志, 森也寸志, 武田育郎, 西田継

    Japan Geoscience Union Meeting 

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    Event date: 2011.5.22 - 2011.5.27

    Language:Japanese   Presentation type:Poster presentation  

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  • 多周波数電磁探査による土壌環境管理の影響評価と潜在的汚濁負荷の推測 International conference

    川原まどか, 森也寸志, 井手淳一郎, 宗村広昭

    Japan Geoscience Union Meeting 

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    Event date: 2011.5.22 - 2011.5.27

    Language:Japanese   Presentation type:Poster presentation  

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  • EM Sounding Characterization of Soil Environment toward Estimation of Pollution from Non-point Sources. International conference

    Y. Mori, J. Ide, H. Somura and T. Morisawa

    American Geophysical Union Fall Meeting 

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    Event date: 2010.12

    Language:English   Presentation type:Oral presentation (general)  

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  • 多周波数電磁探査法による土地管理に影響された土壌環境の特徴抽出

    川原まどか・宮本珠未・大西政夫・森 也寸志

    土壌物理学会大会 

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    Event date: 2010.10

    Language:Japanese   Presentation type:Poster presentation  

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  • レーザ回折式粒度分布測定装置をもちいた土の粒度試験

    森澤太平・森 也寸志

    土壌物理学会大会 

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    Event date: 2010.10

    Language:Japanese   Presentation type:Poster presentation  

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  • 人工マクロポアによる土壌水下方浸透の促進と有機物貯留の可能性

    森 也寸志・藤原篤志・山本哲也・丸田恵理子

    土壌物理学会大会 

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    Event date: 2010.10

    Language:Japanese   Presentation type:Poster presentation  

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  • 人工マクロポアによる土壌中の下方浸透の促進

    丸田恵理子・山本哲也・森 也寸志

    土壌物理学会大会 

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    Event date: 2010.10

    Language:Japanese   Presentation type:Poster presentation  

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  • 多周波数電磁探査法による人工林の土壌環境の特徴抽出

    森 也寸志・宗村広昭・井手淳一郎・森澤太平

    水文・水資源学会研究発表会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Poster presentation  

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  • Application of SWAT for nutrient load discharge estimation International conference

    H. Somura, I. Takeda, Y. Mori and D. Hoffman

    2010 International SWAT Conference 

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    Event date: 2010.8

    Language:English   Presentation type:Oral presentation (general)  

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  • Differences in land-use effects on river nutrient concentrations between coniferous and broad-leaved forests in the Hii River basin International conference

    J. Ide, Y. Mori, I. Takeda, Y. Sakuno, H. Somura and T. Morisawa

    2010 Western Pacific Geophysics Meeting 

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    Event date: 2010.7

    Language:English   Presentation type:Oral presentation (general)  

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  • Enhancing Bio-remediation Process for Oil-contaminated Soils by Controlling Nutrient Dispersion using Dual-Characteristics of Soil Pore System. International conference

    Y. Mori, Y. Matsumoto and A. Fujihara

    Interfaces Against Pollution 

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    Event date: 2010.5

    Language:English   Presentation type:Oral presentation (general)  

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  • 粗放化した農林地が流域の河川水質に及ぼす影響 International conference

    井手 淳一郎,森 也寸志,武田 育郎,宗村 広昭,作野 裕司

    Japan Geoscience Union Meeting 

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    Event date: 2010.5

    Language:Japanese   Presentation type:Poster presentation  

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  • EM Sounding Characterization of Soil Environment toward Estimation of Pollution from Non-point Sources. International conference

    Y. Mori, J.Ide, H. Somura, T. Morisawa

    Japan Geoscience Union Meeting 

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    Event date: 2010.5

    Language:English   Presentation type:Poster presentation  

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  • Effective Vertical Solute Transport in Soils by Artificial Macropore System International conference

    Mori, Y. and Y. Hirai

    Japan Geoscience Union Meeting 

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    Event date: 2010.5

    Language:English   Presentation type:Poster presentation  

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  • 多周波数電磁探査による土壌環境の特徴抽出と潜在的汚濁負荷の推測

    森 也寸志

    2010土壌水分ワークショップ 

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    Event date: 2010.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • The Effects of Environmental Degradation and People Management on World Heritage International conference

    Yasushi Mori

    World Heritage for Tomorrow: What, How and For Whom? 

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    Event date: 2010.2

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 土壌中への選択的溶液輸送による土壌環境の修復 Invited

    森 也寸志

    山陰発 新技術説明会 

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    Event date: 2009.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • A study on relationships between land-uses and nutrient transports in Hii River basin International conference

    Ide J, Takeda I, Mori Y, Somura H

    American Geophysical Union Fall Meeting 

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    Event date: 2009.12

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  • Influence of bird feces to water quality in paddy fields during winter season International conference

    Somura, H., I. Takeda, T. Masunaga, Y. Mori and J. Ide

    American Geophysical Union Fall Meeting 

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    Event date: 2009.12

    Language:English   Presentation type:Poster presentation  

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  • Controlling Solute Transport Processes in Soils by using Dual-Porosity Characteristics of Natural Soils. International conference

    Mori Y and Higashi N.

    American Geophysical Union Fall Meeting 

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    Event date: 2009.12

    Language:English   Presentation type:Poster presentation  

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  • 人工マクロポアを利用した土壌環境修復

    藤原篤志・森 也寸志

    土壌物理学会大会 

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    Event date: 2009.10

    Language:Japanese   Presentation type:Poster presentation  

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  • 降雨条件が土壌浸透水質へ及ぼす影響

    森澤太平・森也寸志・井手淳一郎・宗村広昭・武田育郎・井上光弘

    土壌物理学会大会 

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    Event date: 2009.10

    Language:Japanese   Presentation type:Poster presentation  

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  • 人工マクロポアによる土壌中の効率的な溶質浸透

    森也寸志・藤原篤志・平井優也

    土壌物理学会大会 

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    Event date: 2009.10

    Language:Japanese   Presentation type:Poster presentation  

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  • Effects of forest land-use on nitrogen and phosphorus transports in the Hii River basin International conference

    Ide J, Takeda I, Mori Y, Somura H.

    2nd International Conference on Forests and Water in a Changing Environment 

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    Event date: 2009.9

    Language:English   Presentation type:Oral presentation (general)  

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  • 局地集中豪雨が森林流域における水質形成へ及ぼす影響

    森澤太平・森也寸志・井手淳一郎・宗村広昭・武田育郎・井上光弘

    水文・水資源学会研究発表会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Poster presentation  

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  • 土壌中への選択的溶液輸送による土壌環境の修復

    森 也寸志

    イノベーションジャパン 

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    Event date: 2009.9

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  • 土壌中の移流・分散制御による選択的物質輸送 Invited

    森 也寸志

    化学工学会 

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    Event date: 2009.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 多周波数電磁探査法による汚濁負荷量推測の試み

    森也寸志・宗村広昭・江草直和・井手淳一郎・森澤太平

    水文・水資源学会研究発表会 

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    Event date: 2009.8

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  • Optimizing Remediation Process of Contaminated Soils by Controlling Nutrient Injection Rate

    Yasushi Mori

    Japan Geoscience Union Meeting 

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    Event date: 2009.5

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  • Enhancing Bio-remediation by Controlling Nutrient Distribution Area in Contaminated Soils

    Fujihara A. and Mori Y.

    Japan Geoscience Union Meeting 

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    Event date: 2009.5

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  • Controlling Solute Transport Process in Soils using Dual-Characteristics of Soil Pore System International conference

    Mori, Y. and N. Higashi

    Interfaces Against Pollution 

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    Event date: 2008.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan  

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  • ESTIMATION OF SUSPENDED SOLID DISCHARGE TO A BRACKISH LAKE IN SHIMANE PREFECTURE, JAPAN International conference

    Somura, H., I. Takeda and Y. Mori

    5th SWAT International Conference 

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    Event date: 2008.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Beijing, China  

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  • Relationship between farming activities and water quality variations of drainage water from paddy fields area International conference

    Somura, H., I. Takeda and Y. Mori

    .World Environmental & Water Resources Congress 

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    Event date: 2008.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:(Honolulu, U.S.A.)  

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  • Characterization of soil hydrological processes in degraded hill slope toward reducing environmental load discharge International conference

    Y. Mori

    International Symposium, Restoration and Sustainability of Estuaries and Coastal Lagoons 

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    Event date: 2007.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Matsue, Japan  

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  • Application of the SWAT Model to the Hii River Basin, Shimane Prefecture, Japan International conference

    Somura, H., D. Hoffman, J. Arnold, I. Takeda and Y. Mori

    4th International SWAT Conference 

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    Event date: 2007.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Delft, the Netherlands  

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  • Environmental Engineering in Vadose Zone ?Structure - Induced Solute Transport Processes in Unsaturated Soils? International conference

    Y. Mori

    International Seminar, Sustainability of the precious water environment 

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    Event date: 2005.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Matsue, Japan  

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  • Initial aggregate formation of masa soil with organic matter application and repeated wet/dry processes

    Ryoki Ihara, Yasushi Mori

    Japan Geophysical Union Annual meeting  2022.6.1 

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  • Improving red-soil in Thailand by mixing natural latex

    Yasushi Mori, Toru Honzane, Hiroaki Somura, Jun Kano, Mamoru Matsushima, Bnaja Junhasavasdikul

    Japan Geophysical Union Annual meeting  2022.5.24 

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  • Methane gas emission from paddy soils affected by water and structural management

    Yasushi Mori, Mizuki Hasui, Long Thanh Bui

    Japan Geophysical Union Annual meeting  2022.5.24 

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Industrial property rights

  • 土壌改質方法

    森 也寸志

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    Applicant:国立大学法人島根大学

    Application no:特願2009-206564  Date applied:2009.9.8

    Announcement no:特開2011-055733  Date announced:2011.3.24

    Patent/Registration no:特許第5522626号  Date registered:2014.4.18 

    J-GLOBAL

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  • 土壌管理方法

    森 也寸志

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    Applicant:国立大学法人島根大学

    Application no:特願2007-049627  Date applied:2007.2.28

    Announcement no:特開2008-211984  Date announced:2008.9.18

    Patent/Registration no:特許第4929464号  Date registered:2012.2.24 

    J-GLOBAL

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  • 土壌水移動速度導出方法および土壌水移動速度測定装置

    森 也寸志, 石井 将幸

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    Applicant:国立大学法人島根大学

    Application no:特願2005-131711  Date applied:2005.4.28

    Announcement no:特開2006-308433  Date announced:2006.11.9

    Patent/Registration no:特許第4644806号  Date registered:2010.12.17 

    J-GLOBAL

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Works

  • 非破壊試験による多孔質製品の性能評価方法の開発

    2005

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  • 生態及び土壌水文環境モニタリングのための多機能熱パルスセンサーの開発

    2003
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    2005

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  • 多機能センサーによる水分・塩分・熱移動特性の同時測定

    2003

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  • 土壌の二重間隙モデルに基づく環境負荷物質移動特性の解明

    2001
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    2002

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  • 土壌構造の不均一性が不飽和透水係数に及ぼす影響

    2000

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Awards

  • Outstanding research paper

    2021.9   Impacts of hydrological changes on nutrient transport from diffuse sources in a rural river basin, western Japan. Journal of Geophysical Research – Biogeosciences, 124(8), 2019

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  • 環境技術学会40周年記念論文賞

    2010  

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    Country:Japan

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  • 土壌物理学会賞(論文賞)(corresponding author)

    2006  

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    Country:Japan

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  • 土壌物理学会賞(優秀ポスター賞)

    2005  

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    Country:Japan

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  • 農業土木学会研究奨励賞

    2000  

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    Country:Japan

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Research Projects

  • 植物根成孔隙マクロポアを活用した有機物蓄積と温室効果ガスの排出削減

    Grant number:21H04747  2021.04 - 2025.03

    日本学術振興会  科学研究費助成事業 基盤研究(A)  基盤研究(A)

    森 也寸志, 松本 真悟, 前田 守弘, 金子 信博, 宗村 広昭

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    Grant amount:\41860000 ( Direct expense: \32200000 、 Indirect expense:\9660000 )

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  • フィリピン及び日本の棚田群の劣化プロセスの解明と生態工学的保全手法の構築 International coauthorship

    2020.11 - 2022.10

    住友財団  環境研究助成金  課題研究:深刻化する環境問題の理解および解決のための学際研究または国際共同研究

    森 也寸志, 宗村広昭, 前田守弘, Milagros O. How, Pearl B. Sanchez

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\7500000 ( Direct expense: \7500000 、 Indirect expense:\7500000 )

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  • Establishment of the unified theory for water movement in porous media under various gravity conditions

    Grant number:20K20300  2017.06 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)  Grant-in-Aid for Challenging Research (Pioneering)

    登尾 浩助, 溝口 勝, 加藤 雅彦, 小島 悠揮, 森 也寸志

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    Grant amount:\25740000 ( Direct expense: \19800000 、 Indirect expense:\5940000 )

    前年度の実施した微小重力条件下における様々な実験結果の整理を主に行った。国際学会で口頭とポスターを合わせて6件の発表と国内学会において口頭とポスターを合わせて6件の発表を行った。さらに、これまでの研究成果をもとにして、卒業論文1編と博士論文1編が提出された。発表題名は、Capillary force under microgravity estimated from Hagen-Poiseuille equation, Similarity of water movement in porous media under the conditions of microgravity and hydrophobicity, Effects of shapes of pore throat on water infiltration under microgravity, Challenges to understanding water imbibition under microgravity by numerical simulation, 微小重力下における接触角測定のための2 m落下施設の適用性, 重力の変化と粘性の関係, 単一間隙内の水分挙動に対する間隙形状および接触角の影響, 重力の変化が水の粘性に与える影響, 低重力下における不飽和多孔質体中の水分移動速度, Measurement of surface tension under microgravity with the maximum bubble pressure method, The behavior of liquids in porous media with different particle size under variable gravity, 多孔質体中の浸潤速度と重力の関係であった。
    また、野川健人. 2019. 多孔質体中の浸潤に関わる水の粘性、接触角の重力依存性の評価. 明治大学農学部農学科卒業論文.(未発表)と佐藤直人. 2019. 多孔質体中の水分挙動の重力依存性. 明治大学大学院農学研究科2018年度博士学位請求論文が提出され、受理された。

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  • 地球陸域表層で土壌有機物が分解を逃れ蓄積していくメカニズムの探索

    Grant number:17H01496  2017.04 - 2021.03

    日本学術振興会  科学研究費助成事業 基盤研究(A)  基盤研究(A)

    森 也寸志, 松本 真悟, 金子 信博, 大澤 和敏, 辻本 久美子

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    Grant amount:\43160000 ( Direct expense: \33200000 、 Indirect expense:\9960000 )

    土壌流亡は営農に影響を与えるだけでなく,有機物の消失としてもとらえられ,土壌環境に悪影響を与える.透水性の低い層であるクラストの発生がその原因の一つであり,強雨時の雨滴の衝撃,土壌間隙の目詰まりにより生じる.対策として鉛直孔隙に繊維状物質を挿入する人工マクロポアを提案し,流亡対策と成り得るデータが示したが,さらに労力軽減のために線状型マクロポアを提案したのでその効果を報告する.線状マクロポアは従来の穴の代わりに深さ30cm程度の溝を引き,サトウキビ残渣を鋤き込む.線状型マクロポアの下方浸透促進による表面流出・土壌流亡を抑制し,もって表層土壌の保全をすることを研究の目的とした.
    供試土として沖縄県石垣島のサトウキビ圃場から採取した土壌をライシメータに充填し,現場と同じ傾斜3%で設置し,時間20㎜の降雨を4時間降らせ,降雨終了24時間後に同様の条件で再度雨を降らせた.対照区として耕起区,植物残渣を表層に残す不耕起区,線状型マクロポア区,中空溝切のみの溝切区を用意し,表面流出,下方排水,土壌水分,流出土砂量を測定した.
    実験の結果,表面流出量は耕起区で最も多く,次に不耕起区で多かった.線状型マクロポア区では表面流出は発生しなかった.溝切区では溝構造の崩壊が起こり,まもなく目詰まりを起こした.圃場調査では溝切区において目詰まりが発生することにより表面流出,土砂流出が増加すると推定されていたが、今回の結果から降雨の早い段階で構造そのものが崩壊している可能性が示された.これは現場圃場で観察されていたこととよく一致し,
    その際に表層土壌から奪われる有機物の量は,保全的活動で表層土壌で蓄積される有機物量とほぼ同じくらいであることがわかった.土壌の劣化原因として表土流亡が知られているが,有機物の消失についても非常に大きなインパクトを持つことが明らかであった.

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  • Degrading Process Analysis and Hydrological Estimation of Environmental Management for Rice Terraces in the Philippines.

    Grant number:17H04484  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    MORI Yasushi

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    Grant amount:\15860000 ( Direct expense: \12200000 、 Indirect expense:\3660000 )

    The Cordillera rice terraces in the northern part of the Philippines, known as a World Heritage, conveys the traditional culture of the region and exists as a production base for rice cropping and a part of natural water and material cycles. However, the collapse of rice terraces has become more serious, and proper and efficient farm management has been required to maintain the rice terraces.We focused on the structure of the rice terraces and the circulation of water and materials, and found that hard pan, which was formed in the lower layers of the paddy fields to store water, decided the stability of the rice terraces.There were some rice terraces with excess organic matter and the paddy can pond the water by small particle clogging without forming hard pan.If that was the case, mineral leaching occurred and stability of the paddy becomes lower.
    We can conclude that hard pan is invisible, but its formation is crucial for stable rice paddy management.

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  • Evaluation of nutrient load inputs to winter-flooded paddy fields by overwintering Tundra Swan

    Grant number:15K07647  2015.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Somura Hiroaki

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    In this study, we evaluated an influence of overwintering Tundra Swan against water quality and soil fertility in winter-flooded paddy fields. In the field survey, we observed the daytime behavior pattern of the birds and understood their activities. We collected surface water in the paddy fields and analyzed water qualities such as T-P and T-N. In addition, the paddy soils before and after overwintering were collected and analyzed pH, EC, T-N, Available-P, and C/N ratio. As results, regarding the water quality, a statistically significant difference was confirmed between the number of staying Tundra Swan and the water quality fluctuation. However, soil fertility and the number of the birds were still unclear.

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  • Transport and immobilization of radioactive fallout using artificial macropore -Reducing radiation without surface soil disposal-

    Grant number:26550067  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    MORI Yasushi

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    Fukushima nuclear power plant damaged by the East Japan Great Earthquake caused radioactive fallout around the Tohoku region. Because radioactive fallout was positively charged, it was reported to be adsorbed to soil surface. Surface soil scraper and deep plowing would be, therefore, effective for the removal of radioactive materials. However, these scraped surface soils caused another issue for disposal. Therefore in this research project, artificial macropore which imitated the natural soil pores were installed in agricultural soils to transport the radioactive Cesium to deeper profile and adsorb on the mineral soils. Results showed that elution process by Ammonium Sulfate, transport process by artificial macropore and absorption inhibition process by Potassium Chloride were needed for the effective management in agricultural field.

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  • Artificial macropore installation in degraded soils to enhance vertical infiltration and increase organic matter.

    Grant number:26292127  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    MORI Yasushi

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    Grant amount:\15990000 ( Direct expense: \12300000 、 Indirect expense:\3690000 )

    Artificial macropores were created in the degraded soils to enhance vertical infiltration. Numerical simulation of infiltration with surface flow was successfully achieved when we assume “air space” above the soil surface. Infiltration was effectively improved when fibrous materials were used, with the filling density of 30%. Column experiments showed that organic matter which was infiltrated into deeper profile has resistivity to decomposition, because of less air and water availability at this profile. Field experiment at subtropical region showed surface runoff and also sediment loss were reduced effectively with the artificial macropore application. The resultant total carbon at this field slightly increased.

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  • Development of system dynamic model of plantation to evaluate the sustainable production of crops by appropriate recycle of biomass residues

    Grant number:25220104  2013.05 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)  Grant-in-Aid for Scientific Research (S)

    FUJIE Koichi, Utomo Muhajir, Hasanudin Udin, Niswati Ainin, MINAMIYA YUKIO, MIURA TOSHIKO

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    Grant amount:\127660000 ( Direct expense: \98200000 、 Indirect expense:\29460000 )

    Research on tropical plantations of sugarcane, palm and cassava was carried out in south Sumatra, Indonesia. We have found that no-tillage increased both litter and soil microbial biomass and diversity, and mulching increased microbial biomass, whereas diversity was decreased by mulching. No-tillage with bagasse mulching gave the similar crop yield of sugarcane with the conventional practice.
    Material flow analyses were performed in the crop processing factories, biomass residue and wastewater treatment, and the recycling systems such as methane fermentation, composting, beef cattle fattening, and so on. Based on the obtained data and information, a system model to design and evaluate the biomass residue recycle system for the plantation was developed. Environmental impact of plantation and requirements for the disseminating the biomass residue recycle system into the plantation have been clarified through this research.

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  • 人工マクロポアによる土壌水下方浸透の促進と有機物貯留による劣化土壌環境の修復 International coauthorship

    Grant number:GS021  2011.02 - 2014.03

    日本学術振興会  最先端・次世代研究開発支援プログラム 

    森 也寸志

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\76700000 ( Direct expense: \59000000 、 Indirect expense:\17700000 )

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  • 人工マクロポアを用いた土壌水下方浸透の促進と有機物貯留による劣化土壌環境の修復

    Grant number:23380142  2011

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    森 也寸志

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    Grant amount:\11180000 ( Direct expense: \8600000 、 Indirect expense:\2580000 )

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  • Biodiversity index of agriculture and forest soils for sustainable land use

    Grant number:21241010  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    KANEKO Nobuhiro, MASUNAGA Tsugiyuki, MORI Yasushi, YAMASHITA Tamon, KOMATSUZAKI Masakazu, TAKAHASHI Masamichi, HASEGAWA Motohiro, OHTA Hiroyuki

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    Grant amount:\43160000 ( Direct expense: \33200000 、 Indirect expense:\9960000 )

    We analyzed soil biodiversity and functioning in forest and cropland soils to establish a sustainable land use. Forest management did not change soil community and structure, while fine particles and microaggregates increased with forest age. Cultivation of soil in cropland was detrimental to soil biodiversity and aggregates. However, no tillage with weed introduction increased soil sequestration in a short time periods. We conclude that soil aggregates which are formed by biological activities is important index for soil fuction.

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  • Recycling system of phosphorus resources using iron-oxidizing bacteria and woody biomass

    Grant number:20380179  2008 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    TAKEDA Ikuo, NISHINO Yoshihiko, FUKADA Koutaro, SATO Hirokazu, SOMURA Hiroaki, MORI Yasushi

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    Grant amount:\19760000 ( Direct expense: \15200000 、 Indirect expense:\4560000 )

    The biogenic iron oxides produced by iron oxidizing bacteria in the sediments of natural water bodies contains a large amount of iron-oxidized compounds that can adsorb phosphorus content. Therefore, this accumulation can play a significant role in the recycling of phosphorus resources. However, this sediment of phosphorus-rich accumulation cannot be efficiently utilized because it can be easily flushed by flowing water and because it is difficult to collect the accumulation from the sediments that usually contain anaerobic and malodorous mud. In this study, an effective method has been developed, in which a wood material carrier collecting the iron oxides can directly be used as phosphorus fertilizer and/or a phosphorus adsorption.

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  • Restoration and long-term ecological research of brackish lake ecosystem in Lake Nakaumi after the registration of Ramsar convention

    Grant number:19201017  2007 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    KUNII Hidenobu, SETO Koji, NONAKA Tsuguhiro, MORI Yasushi, AIZAKI Morihiro, ISHIGA Hiroaki, NOMURA Ritsuo

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    Grant amount:\46280000 ( Direct expense: \35600000 、 Indirect expense:\10680000 )

    This research project aimed at developing a new model for the wise use of estuaries and coastal lagoons by conducting interdisciplinary research on complex phenomena relevant for conservation and management of the lagoon system, especially that of damaged Lake Nakaumi.

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  • Development of a method for estimating the travel time and origin of colloid particles in soil

    Grant number:19580389  2007 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    EGUCHI Sadao, YAMAGUCHI Noriko, FUJIWARA Hideshi, MORI Yasushi, SEKI Katsutoshi

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    A novel method for estimating the travel time and origin of the mobile colloid particles in soil was developed by using the environmental radioisotopes of ^7Be, ^<137>Cs and ^<210>Pb strongly adsorbing to the soil colloids for tracing the mobile colloid particles. Based on this method, the colloid particles discharged from the tile drainage in a clayey soil and that moving downward through the subsoil of a sandy soil were found to be mainly originated from the surface soils ; furthermore, the travel time of the colloid particles transported through the clayey soil was calculated to be approximately 35d.

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  • A cost effective soil environment management using selective solute transport management governed by convection and dispersion.

    Grant number:18510074  2006 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    MORI Yasushi

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    Grant amount:\4140000 ( Direct expense: \3600000 、 Indirect expense:\540000 )

    自然に存在する土壌にはマクロポアと呼ばれる粗大間隙があり,溶質が迅速に流れ出てしまい,効果的な施肥や薬剤散布を妨げている.そこで土壌が僅かに不飽和になる条件下で溶質移動を行うと分散が卓越し,溶質が正規分布様に土壌全体に分散し,汚染土壌の浄化では効率的に栄養塩を土壌細部に送り届けることが出来た.人工的にこの構造を作ると,浸透を制御できる限りにおいて,湛水を防止し,長期に溶質浸透を可能にできることが明らかになった.

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  • Analytical system on water and soil environment in paddy field areas for animal-habitat conservation

    Grant number:16380221  2004 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    TAKEDA Ikuo, MORI Yasushi, ISHII Masayuki, KIHARA Yasutaka, SOMURA Hiroaki

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    Grant amount:\16070000 ( Direct expense: \15800000 、 Indirect expense:\270000 )

    Environmental factors of agricultural and forestry areas were evaluated in the light of hydrology, water quality and soils science in paddy field and forestry areas in the eastern part of Shimane prefect= and other districts. In particular for the environment for animal habits in agricultural areas, the relationship between bio-diversity and environmental factors were evaluated in a paddy-field area in the eastern part of Shimane Prefecture. The parameters were water qualities, fishes, aquatic insects, and physics' environmental factors (breadth of canal, water depth, flow velocity, vegetation coverage, and soil coverage of undersurface) in drainage canals. As a result, eleven species of fishes and fourteen species or family of aquatic insects were observed in the investigation sites and diversity indexes calculated by Shannon-Wiener method were evaluated. Then, it was clarified that the diversity indexes for aquatic insects were affected by some water qualities, breadth of canal and soil coverage of undersurface. On the other hand for the mass balance of pollutants in a paddy field watershed using a circular irrigation system, a long-term investigation on the water quality and hydrology was carried out As a result, the change in annual pollutant loads was primarily attributed to the amount of hydrological water volumes (the annual amount of rainfall or that of rainfall plus irrigation water), and the purification function was related to the hydraulic retention time. By using these results, the environmental factors in agricultural and lineally area were evaluated in the light of material cycles, hydrology, water quality and sail science. Moreover the main factors were quantified and relationships among them were evaluated in other to integrate the GIS based environmental analysis.

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  • Development of measurement techniques for the solute transport in undisturbed soil column and downward flow through the root zone in an irrigated farmland under arid conditions

    Grant number:16380159  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    INOUE Mitsuhiro, YAMAMOTO Sadahiro, INOSAKO Koji, MORI Yasushi, TORIDE Nobuo, HIGASHI Naoko

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    Grant amount:\15300000 ( Direct expense: \15300000 )

    It is necessary to develop the measuring technology of downward flux under leaching for desalinization. Research results are summarized as follows :
    1. The measuring accuracy using dielectric moisture probe and four-electrode sensor was examined, new calibration method of simultaneous measuring soil water content and salinity was proposed, and the water balance and salt balance in irrigated farmland were evaluated. New TDR sensor with a little influence with the salt was also developed, and the characteristics of salinity movement in the root zone was determined through the measurement of moisture content and salinity concentration in the undisturbed soil under salt water drip irrigation.
    2. An undisturbed soil column sampler in the field was development. From the investigation it was observed that the dispersivity of the saturated undisturbed soil were significantly greater than disturbed soil. The characteristics of the water flow and solute transport through undisturbed Andisols with aggregated soil structure was also examined.
    3. Leaching experiment of nitrate nitrogen was conducted using monolith lysimeter in Scallion sand field, and the influence of undisturbed soil structure in the field on the flow of nitrate nitrogen was monitored.
    4. To measure downward flux from the root zone in real time, a wick lysimeter and a downward flux sampler were developed and buried in the sandy field. High water collecting efficiency was obtained for the downward flux sampler with automatic recording flux and electrical conductivity.
    5. Water extraction text of wick sampler was conducted in the sandy field. The cause and measures of over water sampling discharge using wick sampler were discussed by the analyzing water balance and soil environmental data.
    6. Soil moisture content, bulk soil electric conductivity and downward flux were measured using multi-functional heat pulse probe. Coverage and limit of the probe were assessed and a useful soil environmental monitoring technology was developed.

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  • Change of Agricultural Water Management and Its Evaluation of Influence on Hydrological and/or Water Quality Environment in the Area of Lake Shinji and Nakaumi

    Grant number:09556048  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    FUKUSHIMA Akira, MORI Yasushi, TAKEDA Ikuo

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    Grant amount:\12900000 ( Direct expense: \12900000 )

    The basic purpose of this study is to develop a technique offering the hydrological and water quality information needed for agricultural water management of Hii River. It also provides an useful information for future way of water environment in this district. The results are as follows : 1. (1) Availability of a proposed method for indentification of runoff model was examined , in which was improved with respect to evaluate a set of runoff model parameter in the any significant digit designated for each parameter. (2)A runoff analysis system was developed by UNIX workstation. (3)But, it was recognized that the further improvement of runoff model and investigation of identification method was necessary for the analysis considered inundation phenomena and condition of agricultural water management. 2. (1) The pollutant fluxes of pollutants were elucidated in a paddy field watershed where a circular irrigation system was implemented. The contribution of pollutant flux in return flow to theater environment was evaluated. (2)The pollutant runoff from upland fields in the mountainous area was evaluated, The nitrogen outflows including the pollutants on rainy days were monitored in experimental lysimeters. It was concluded that saving fertilizer application using resin-coated fertilizer can contribute to the reduction of nitrogen outflows from upland fields. 3. (1) Drainage from undisturbed paddy soils, upland field soils and forest soils were analyzed using soft X-ray radiography. Drainage proceeded from macropore first then to matrix in paddy and upland field soils. On the other hand for forest soils, drainage has occurred in matrix only. Unsaturated hydraulic conductivity obtained from inverse problem showed discontinuity between saturation and near-saturation, which indicated flow region was different. Macropore was considered to channel the drainage at early stage, then matrix conducted the water flow.

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  • Representation of Numerical Basin Model in the Rural and Mountainous Region by Image Processing and Its Application to Forecasting of Flood Runoff

    Grant number:08456118  1996 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    FUKUSHIMA Akira, MORI Yasushi, IKUO Takeda

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    Grant amount:\1700000 ( Direct expense: \1700000 )

    The study purposes to provide an application of topographic information in watershed to the forecast of runoff through the computer workstation. Especially, a discussion is developed on setting the viewpoint at moutainous rural area in San-in district. The results are as follows : 1.(1) Modified runoff models based on the long and short term runoff model or the lumped KiWS model were proposed for the analysis considering the effect of basin topography and distribution of impermeable area. (2) Runoff calculation system was constructed, by using UNIX workstation, to cany out a series of analysis including data input ; runoff analysis ; and output of hydrographs. 2. (1) The behavior of hydrological water balance and mass balance of pollutant were mesured in a paddy field watershed, where a circular irrigation system is implemented. The contribution of the water drawn from extra area and circulation, the mass balance of pollutants and sediment to the improvement of river basin environment was considered. (2) The hydrological properties were evaluated in the experimental lysimeters. As a result, the amount of percolation water amounted for 60% of precipitation and the surface runoff occurred after the cumulated precipitation reached a certain degree. 3. (1) Soft X-ray radiography of water flow in undisturbed paddy soils, upland field soils and forest soils were carried out. Vertical, independent root channels in paddy soils and networked root channels in upland fields conduct the water flow, On the other hand, interaggregate macropore flow has been observed in forest soils. Resultant Reynolds number for paddy field and upland field soils showed 50-80, which indicated macropore flow was in a transition region from laminar to turbulent.

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  • トレーサ法を用いた土壌水分移動特性の定量解析

    Grant number:07760231  1995

    日本学術振興会  科学研究費助成事業 奨励研究(A)  奨励研究(A)

    森 也寸志

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    Grant amount:\900000 ( Direct expense: \900000 )

    本研究は,飽和土壌に高圧を加え,そこから排水される水の量の変化から土壌の不飽和透水性を解析する「One-Step Outflow法」と水みちを染色し水移動の経路を明らかにする「メチレンブルートレーサ法」を用いて,土壌中の水移動傾向を調べた。
    水田,畑地,森林から非破壊土壌を採取し,トレーサを用いた透水・排水試験を行った。透水試験においては水みちが透水性に優れたマクロポアに限られること,さらにそのマクロポアも全土壌マクロポアの中のごく一部であることが明らかになった。従来バイパス流として土壌体の一部を水が優先的に流れる現象の報告はあったが,それが通水性に優れるマクロポアの中でもごく一部に限定されることを初めて示すことができた。
    排水試験においても土壌からの排水は土壌間隙構造に影響された形態をもつことが明らかになった。水田土壌においてはまず鉛直に,次いで水平方向のマクロポアより排水が進み,最終的に土壌マトリックスから排水が進んだ。畑地も同様にマクロポアからマトリックスへという排水順序が存在した。土壌団粒の発達した森林土壌では両者の区別はほとんどつかなかった。
    土壌中の水移動そのものに焦点を当てる研究手法により土壌内部で複雑な水移動が行われていることが明らかになった。今後水分測定するセンサー部をさらに小さくするなどの工夫をすることで,より精度の高い実験ができるものと考えられる。

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  • 低平水田地帯の農業水利再編計画に関わる水文・水質環境の診断モデル

    Grant number:07556106  1995

    日本学術振興会  科学研究費助成事業 試験研究(B)  試験研究(B)

    福島 晟, 森 也寸志, 武田 育郎

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    複雑な水田用排水系統が形成されている斐伊川下流域では、農業水利再編計画が検討されている。本研究はこうした農村地域の水文・水質環境の定量的・工業的な診断手法の検討を基本目的とする。そして、実態観測を踏まえつつ、潅漑排水計画に関わる雨水流出システムモデル、斐伊川水系の水源部から下流部までの水質環境についての調査診断、圃場レベルでの水質環境と水循環機構との関連を中心に検討した。研究実績の概要は以下のとおりである。1.(1)丘陵山地部をも包含した複数地目から構成される農村地域からの雨水流出システムに対し、KiWSモデルを活用したFORTRAN77による流出計算プログラムの作成、及び(2)流域地形効果を反映して発生させた遅延降雨系列を長短期流出両用モデルに利用するという流出解析法を提示し、その有用性を検証した。2.排水河川水のみを循環潅漑している水田地域を対象として行った水文水質調査に基づき、汚濁物質の収支及び流域のもつ水質浄化機能についての考察、また水生植物群落による浄化量を検討した。その結果、年間の流出量あるいは浄化量は、窒素は16.3kg/ha/yの流出、リンは1.14kg/ha/yの浄化、CODは26kg/ha/yの浄化となった。水生植物群落内の浄化量は、負荷量のフラックスに比べて小さかった。この理由として、河川の面積が流域面積の約1%しかないことが考えられた。3.TDR土壌水分測定装置を用い土壌中の水移動を測定した結果、土性、密度、温度、塩分濃度、プローブのタイプなどによらず一つのキャリブレーションカーブで水分量を測定できることが確認された。また、本測定装置は土壌中に埋設された金属に瞬間的に与えられた電気パルスの伝達速度や波形の衰弱から土壌の電気伝導度を測定するため測定時間が短く、かつ土壌体を破壊することなく水分量が測定可能であることから、圃場レベルでの水・物質移動に着眼した水循環機構に関する実用的な実態調査が可能と判断した。

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  • Study on Development of Visualization System using Soft X-ray for Macro Pores in Soils and Water Movement in them

    Grant number:04556033  1992 - 1994

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Developmental Scientific Research (B)  Grant-in-Aid for Developmental Scientific Research (B)

    MARUYAMA Toshisuke, MORI Yasushi, HORINO Haruhiko, WATANABE Tsugihiro, KYUMA Kazutake

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    Grant amount:\18100000 ( Direct expense: \18100000 )

    In this study, structure of macro-pores in soil, which mainly dominate water and solute movement, were observed using the soft X-ray stereography and the image processing thechnology. So, the three dimensional coordinates of the macro-pores were identified quantitatively. Then, visualization system for water movement or drainage in soil has been developed and relation between water movement and pore structures was examined. The main results are as followings :
    1.Observation of water movement through the macro-pores in soil shows that fast water flows run along root-originated pores and routes are changed by hydraulic gradient.
    2.Visualization of drainage process in saturated soil make clear that pores are drained gradually in order according to their position in the pore networks.
    3.Distribution of macro-pore directions can be dealt quantitatively and statistically in the frequency dimension using the FFT method.
    4.The system for identification of three dimensional coordinates of soil macro-pores was developed using the soft X-ray Stereography of pores, which reliability and utility was examined using the quasi pores made of wire.
    Three dimensional structure of macro-pores was analyzed to get the distribution of their diameters and directions.

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