Updated on 2024/10/18

写真a

 
NAKASHIMA Yoshitaka
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
External link

Degree

  • 博士（農学） ( 岡山大学 )

Research Interests

  • Weed Science

  • 雑草学

Research Areas

  • Environmental Science/Agriculture Science / Crop production science

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

  • Environmental Science/Agriculture Science / Agricultural environmental engineering and agricultural information engineering

Research History

  • Graduate School of Environmental, Life, Natural Science and Technology, Okayama University   Faculty of Agriculture   Associate Professor

    2023.4

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    Country：Japan

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Professional Memberships

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Committee Memberships

  • 日本緑化工学会   会員  

    2016   

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    Committee type：Academic society

    日本緑化工学会

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  • 農業農村工学会   会員  

    2015   

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    Committee type：Academic society

    農業農村工学会

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  • 児島湖流域エコウェブ   企画運営委員  

    2011   

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    Committee type：Academic society

    児島湖流域エコウェブ

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Papers

  • RELATIONSHIP BETWEEN SHOOT DAMAGE AND FLOOD TOLERANCE IN SOUTHERN CATTAIL Reviewed

    Yoshitaka NAKASHIMA, Kentaro SUZUKI, Yoko OKI

    Journal of Environmental Science for Sustainable Society   12 ( 1 )   1 - 8   2023.4

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Graduate School of Environmental Science, Okayama University  

    DOI： 10.3107/jesss.12.1

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  • Habitat preference of the endangered Nagoya Daruma Pond Frog (Pelophylax porosus brevipodus) in paddy levees and fallow paddy fields of Kurashiki, Okayama, western Japan Reviewed

    Masakazu TADA, Yumi MIYAKE, Yoshitaka NAKASHIMA, Kunio ITO, Minoru SAITO, Kazuyoshi NAKATA

    Ecology and Civil Engineering   25 ( 2 )   71 - 85   2023.3

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    Publishing type：Research paper (scientific journal)   Publisher：Ecology and Civil Engineering Society  

    DOI： 10.3825/ece.21-00032

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  • Backwater effect of clogging of aquatic plants at fine-particle screens on inland flooding in Okayama Reviewed

    Inaba, T, Tsujimoto, K, Nakashima, Y

    Water   14   1 - 21   2022.4

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

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  • Transformation of Organic Waste Materials as H2O Gel and Its Influence on Growth of Maize (Zea mays L.) Reviewed

    Mukkram Ali Tahir, M. Shahbaz Akhtar, Yoshitaka Nakashima, Noor Us Sabah, Sayed Haseeb Ul Hassan

    Communications in Soil Science and Plant Analysis   53 ( 1 )   129 - 139   2022.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

    DOI： 10.1080/00103624.2021.1984511

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  • Clogging mechanisms and preventive measures in artificial recharge systems Reviewed

    M. Shahbaz Akhtar, Yoshitaka Nakashima, Makoto Nishigaki

    Journal of Groundwater Science and Engineering   9 ( 3 )   181 - 201   2021.3

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  • Examination of the physical control for the invasive weed Hydrocotyle ranunculoides and its role as habitat for aquatic animals Reviewed

    NAKASHIMA Yoshitaka, FUJII Sayaka, OKI Yoko, NAKATA Kazuyoshi

    WATER, LAND AND ENVIRONMETAL ENGINEERING   88 ( 11 )   899 - 902   2020

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

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  • Occurrence Dynamics of the Submerged Weed Community Caused by Natural Disturbance in Class B River Maekawa of South Okayama Reviewed

    NAKASHIMA Yoshitaka, OKI Yoko, ADACHI Tadashi, NAGAI Akihiro, CHIKAMORI Hidetaka

    IRRIGATION;DRAINAGE AND RURAL;ENGINEERING JOURNAL   88 ( 1 )   I-29 - I-37   2020

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

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  • Estimation of phytofiltration potential for Cu and Zn and relative growth response of Azolla japonica and Azolla Pinnata Reviewed

    Akhtar, M.S, Oki, Y, Bich, B.T.N, Nakashima, Y

    Journal of Agricultural Science and Technology   21 ( 4 )   895 - 909   2019

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

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  • Genotypic Variations in Growth Response and P-acquisition Efficiency by Spring Wheat Cultivars Exposed to Sparingly Soluble P-sources.

    Akhtar, M. Shahbaz, Oki, Y, Nakashima, Y

    International Journal of Bioscience, Biochemistry and Bioinformatics   8 ( 3 )   187 - 194   2018

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  • Evaluation of drop in official air temperature record at Okayama caused by relocation of observation field of Okayama Local Meteorological Obserbatory

    三浦健志, 上田悠生, 守田秀則, 近森秀高, 黒川正宏, 中嶋佳貴, 沖陽子

    岡山大学環境理工学部研究報告(Web)   22 ( 1 )   61 - 64   2017

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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  • Elucidating propagation characteristics to propose a guiding principle for appropriate Iris pseudacorus community management. Reviewed

    NAKASHIMA, Yoshitaka, OKI, Yoko

    JOURNAL OF THE JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY   43 ( 2 )   370 - 374   2017

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  • Differences in flood tolerance of invasive alien species, Iris pseudacorus L. under different cutting treatments Reviewed

    Yoshitaka Nakashima, Yoko Oki

    Journal of Weed Science and Technology   62 ( 3 )   134 - 138   2017

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

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  • Comparison of cold tolerance and seed propagation characteristics of three alien aquatic plants, Hydrocotyle spp. Reviewed

    Yoshitaka Nakashima, Yoko Oki

    Journal of Weed Science and Technology   62 ( 2 )   19 - 24   2017

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Weed Science Society of Japan  

    <p>This study was investigated cold tolerance and seed propagation characteristics to support proper control and management of invasive aquatic plants: Hydrocotyle ranunculoides, H. umbellata, and H. verticillata of Hydrocotyle spp. In winter, H. verticillata grew well under soil moisture conditions from wet to dry. The growth of H. umbellata has had adaptability widely with soil moisture condition from 30 cm submerged to a dry. The growth of H. ranunculoides was inhibited significantly under the dry up condition about 12% of volumetric water content in the soil under low temperatures. H. verticillata and H. umbellata produced no seeds. H. ranunculoides produced some seeds, of which approximately 60% were brown. Their seeds of H. ranunculoides have light dormancy, and their germination rate under the constant temperature condition of 15°C was higher than that under alternating temperature of 30°C/23°C or constant temperature of 30°C.</p>

    DOI： 10.3719/weed.62.19

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  • Evaluation of greening by using weed vegetation in urban-type biotope Reviewed

    NAKASHIMA, Yoshitaka, OKI, Yoko

    JOURNAL OF THE JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY   43 ( 1 )   223 - 226   2017

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

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  • Vegetative propagation characteristics of an alien species: Hydrocotyle ranunculoides Reviewed

    Yoshitaka NAKASHIMA, Yoko OKI

    JOURNAL OF THE JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY   42 ( 4 )   543 - 549   2017

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY  

    This study investigated the growth response of a specific alien species, Hydrocotyle ranunculoides L. f., to differences in water current and scraping on and below the soil surface. Furthermore, growth characteristics of creeping stem cut fragments were surveyed. Non-scraped creeping stems extended about 10 m in two months. The creeping stems were cut naturally in a flowing water-current (0.23 &plusmn; 0.01 m/s) , although the biomass was significantly greater under a stagnant water situation. Plants scraped to soil depth of 1 cm showed greater total biomass than that of plants scraped only on the soil surface. Creeping stem cut fragments having 2 nodes and 3 nodes with non-terminal buds regenerated well. Biomass of the creeping stem cut fragments of 2 nodes increased to more than 80% of that of 4-node fragments. Moreover, the total number of nodes increased almost equally to the total for a 4 node fragment. Results show that the creeping stems reproduced better in the case of scraping treatment, with cutting or damage, than in a non-scraping treatment.

    DOI： 10.7211/jjsrt.42.543

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  • Phosphorus starvation induced differential growth behavior, and P-acquisition and use efficiency by wheat cultivars exposed to sparingly soluble P-sources.

    Akhtar, M. S, Oki, Y, and Y, Nakashima

    International Journal of Bioscience, Biochemistry and Bioinformatics   5 ( 5 )   311 - 320   2016

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  • Phosphorus Stress-Induced Differential Growth, and Phosphorus Acquisition and Use Efficiency by Spring Wheat Cultivars

    M. S. Akhtar, Y. Oki, Y. Nakashima, T. Adachi, M. Nishigaki

    COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS   47 ( S1 )   15 - 27   2016

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS INC  

    Phosphorus (P) is a finite, non-renewable, and natural resource and a vital major nutrient for plant metabolic and developmental processes. However, adverse soil biogeochemical characteristics of alkaline-calcareous soils (especially Aridisols) and highly weathered acid soils (i.e., Ultisols and Oxisols) render orthophosphate (Pi) as the least available major nutrient due to P complexation, sorption, and/or fixation. In such soil environments, plant bioavailable P is only a small fraction of total soil P, seriously limiting crop growth and production. Different plant species, and even cultivars of the same species, may display a suite of growth responses that enable them to solubilize and scavenge soil P either by enhancing external Pi acquisition or reprioritizing internal Pi use under P-stress soil environments. This paper reports relative growth responses, P acquisition and P-use efficiency characteristics by 14 cultivars of spring wheat (Triticum aestivum L.) grown in solution culture with high/low P supply induced by applying soluble NH4H2PO4, sparingly soluble rock phosphate, and Ca-3(PO4)(2). The wheat cultivars exhibited considerable genetic diversity in biomass accumulation, P concentrations, P contents, factor (PSF) and P efficiency characteristics [i.e., P utilization efficiency (PUE), P efficiency (PE), and PE ratio (PER)]. Plant growth and PE parameters were significantly correlated, while P uptake was linearly related with biomass increase and solution pH decrease. The wheat cultivars with high PUE, PER and P uptake, and low PSF, and plant P concentration were more efficient in utilizing P and, hence, more tolerant under P-stress environment. Biomass and P contents of P efficient/low-P tolerant wheat cultivars were superior to P inefficient/low-P sensitive cultivars at all P-stress levels. Hence, P efficient/low-P tolerant cultivars are the most desirable wheat genotypes for P-stress environments because they are able to scavenge more P from sparingly soluble P sources or soil-bound P forms.

    DOI： 10.1080/00103624.2016.1232089

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  • Studies on cutting treatments for proper management of Typha angustifolia and Phragmites australis in urban-type biotope. Reviewed

    NAKASHIMA, Yoshitaka, OKI, Yoko

    JOURNAL OF THE JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY   42 ( 1 )   236 - 239   2016

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  • Differential P-acquisition and growth characteristics of wheat cultivars under buffered P-stress environment. International Journal of Bioscience

    Akhtar, M. S, Oki, Y, Nishigaki, and T, Nakashima

    Biochemistry and Bioinformatics   5 ( 5 )   311 - 320   2015

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  • Phosphorus Stress Induced Variations in Growth Behavior and P Efficiency among Brassica Cultivars Grown with Sparingly Soluble P Sources

    M. Shahbaz Akhtar, Yoko Oki, Makoto Nishigaki, Tadashi Adachi, Yoshitaka Nakashima, Yuki Nakamoto, Claudia Hartwig

    COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS   45 ( 15 )   1995 - 2017   2014

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS INC  

    To evaluate phosphorus (P)-stress-induced relative growth responses, P-efficiency characteristics, P remobilization, and redesign in root architectural systems, Brassica cultivars were grown with sparingly soluble rock phosphate and calcium phosphate [Ca-3(PO4)(2)] or with low/high P supply in solution and sand culture experiments. Tested cultivars showed considerable genetic diversity in biomass accumulation, concentration and contents of P, P-stress factor (PSF), and P-efficiency characteristics [P-utilization efficiency (PUE), P efficiency (PE), and P-efficiency ratio (PER)]. Statistically significant correlations were observed between P efficiency and growth parameters. Elongation rates of primary roots decreased but the length of lateral roots and branched zone elongation rates increased under P starvation. Cultivars remobilized P from metabolically inactive to active sites in P-stressed plants that may have helped low-P-tolerant cultivars to establish a better rooting system, which provided basis for enhanced P-use efficiency and tolerance against P stress. Cultivars depicting high P efficiency and low PSF values were more tolerant and are a better choice to grow under P-stress environments.

    DOI： 10.1080/00103624.2014.919310

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  • Solubilization and Acquisition of Phosphorus from Sparingly Soluble Phosphorus Sources and Differential Growth Response of Brassica Cultivars Exposed to Phosphorus-Stress Environment

    M. Shahbaz Akhtar, Makoto Nishigaki, Yoko Oki, Tadashi Adachi, Yoshitaka Nakashima, Ghulam Murtaza, Tariq Aziz, Muhammad Sabir, Saifullah, M. Aamer Maqsood, M. Zia-ur-Rehman, Abdul Wakeel, Yuki Nakamoto, Claudia Hartwig

    Communications in Soil Science and Plant Analysis   44 ( 7 )   1242 - 1258   2013.4

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    Phosphate (Pi), the fully oxidized and assimilated form of phosphorus (P), influences virtually all developmental and biochemical processes in plants
    however, its availability and distribution are widely heterogeneous. Paradoxically, although total P is abundant in lithosphere, elusive soil chemistry of Pi renders the element the most dilute and the least mobile in natural and agricultural ecosystems, resulting in P deprivation due to its low mobility and high fixation capacity in the soil. Nonmycorrhizal Brassica does not produce specialized cluster/dauciform roots but is an effective P user compared to other crops. Using a soil low in P (Mehlich 3-extractable P) with or without P fertilization, Brassica cultivars showed substantial genetic diversity in P-utilization efficiency (PUE), P efficiency (PE), P-efficiency ratio (PER), and P-stress factor (PSF). Cultivars producing greater root biomass accumulated greater total P contents, which in turn was related negatively to PSF and positively to shoot and total biomass. Plant survival and reproduction rely on efficient strategies in exploring culture media for P. Acquisition of orthophosphate from extracellular sparse P sources may be enhanced by biochemical rescue strategies such as copious H+ efflux and/or carboxylates exudation into rhizosphere by roots via plasmalemma H+-ATPase and anion channels triggered by P starvation. The P-starvation-induced solution pH changes due to H+ efflux, and carboxylates exudations were estimated by low-P-tolerant and low-P-sensitive cultivars in solution culture experiments. Low-P-tolerant cultivars showed more decrease in pH compared to low-P-sensitive cultivars when cultivars were grown under a P-stress environment induced by using sparingly soluble P sources (rock phosphate and tricalcium phosphate). The P contents of cultivars were inversely related to decrease in culture media pH. Low P-tolerant cultivars presented enhanced H+-efflux and total carboxylates exudations compared to low-P-sensitive cultivars, resulting in more rhizosphere acidification to scavenge Pi, evidencing their adaptability to P starvation. These elegant P-stress-induced rescue strategies by tested cultivars provided the basis of enhanced P solubilization and acquisition of P from sparingly soluble P sources to combat P-starved environments. © 2013 Copyright Taylor &amp
    Francis Group, LLC.

    DOI： 10.1080/00103624.2012.756005

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  • Effects of light, temperature and storage conditions on the germination of Iris pseudacorus seeds. Reviewed

    Yoshitaka Nakashima, Yoko Oki

    Journal of Weed Science and Technology   50 ( 4 )   296 - 299   2005

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    DOI： 10.3719/weed.50.296

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  • Relationship between the position effects, the seed shapes, the dehiscence grades of the capsules and the seed coat crack and the autumn emergence of Iris pseudacorus seed Reviewed

    Nakashima Yoshitaka, Oki Yoko

    Journal of Weed Science and Technology   50 ( 4 )   276 - 283   2005

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Weed Science Society of Japan  

    The purpose of these experiments was to determine the relationship between that the seed coat colors, the position effects, the seed shapes, the dehiscence grades of the capsules and the seed coat crack of Iris pseudacorus and the germination characteristics of seeds that come into emergence in autumn. In the seeds which were floating the water surface, compared with the brown seed and black seed, the white seed had a little deep dormancy. The differences of dormancy depending on a position effect, a seed shape, and differences resulting from a dehiscent time were little, so it was considered that the relevance with autumn emergence is low. Dormancy of the seed remaining in dehiscence capsules became deeper under air-dried storage of the room temperature conditions, and the breaking of dormancy was enhanced by 5℃ wet-storage. However, at a field test, there was no correlation between the rate of the emergence and the dehiscence grades of the capsules. The emergences mainly occurred in the next spring after seed ripening, but some of seeds germinated at the rate of 2-16% in the autumn of the ripened year. The seed in which seed coat cracked germinated earlier, and it was shown that their cumulative germination percentage was high even under 30℃ constant conditions. Therefore, it was thought that the seed in which seed coat cracked had contributed to the autumn emergence greatly.

    DOI： 10.3719/weed.50.276

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  • Effect of different underground water level in planting area of artificial tidal flat on the community development and the internal structure of two species of Hydrocotyle

    Oki Y., Hara K., Nakashima Y.

    J. Weed Sci. Tech.   50   158 - 159   2005

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    Language：Japanese   Publisher：The Weed Science Society of Japan  

    DOI： 10.3719/weed.50.Supplement_158

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  • Effect of planting method and microenvironment on the community development of Iris pseudacorus in artificial tidal flat

    Nakashima Y., Oki Y.

    J. Weed Sci. Tech.   50   160 - 161   2005

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    Language：Japanese   Publisher：The Weed Science Society of Japan  

    DOI： 10.3719/weed.50.Supplement_160

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  • The restoration of vegetation by using seedling of Pueraria lobata on the slope of quarry

    Oki Y., Mishima T., Nakashima Y.

    J. Weed Sci. Tech.   50   156 - 157   2005

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    Language：Japanese   Publisher：The Weed Science Society of Japan  

    DOI： 10.3719/weed.50.Supplement_156

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  • Relationship between day length and emergence of runner of Phragmites japonica

    Nakamura J., Oki Y., Adachi T., Nakashima Y.

    J. Weed Sci. Tech.   50   132 - 133   2005

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    Language：Japanese   Publisher：The Weed Science Society of Japan  

    DOI： 10.3719/weed.50.Supplement_132

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  • A soil reaction of physical and chemical properties with root system development of Persicaria japonica

    Oki Y., Matsuoka Y., Nakashima Y.

    J. Weed Sci. Tech.   50   162 - 163   2005

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    DOI： 10.3719/weed.50.Supplement_162

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Books

  • 児島湖グリーンガイド

    沖陽子，中嶋佳貴他（ Role： Joint author ,  植物編）

    吉備人出版  2012.4 

  • 雑草学辞典WEB版

    （ Role： Contributor）

    2011.4 

MISC

  • 外来水生植物キショウブの繁殖特性と適切な管理法

    中嶋佳貴

    岡山大学農学部学術報告   21 - 25   2022

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    Authorship：Lead author   Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

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  • 農業分野における外国人技能実習生に対する日本語教育の現状と課題－教材開発に向けた予備調査の結果から－

    毛利貴美, 中嶋佳貴

    岡山大学全学教育・学生支援機構教育研究紀要   ( 6 )   191 - 205   2021

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

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  • Effect of the invasive weed Hydrocotyle ranunculoides on agroecosystem and examination of the physical control

    中嶋佳貴, 藤井清佳, 沖陽子, 中田和義

    農業農村工学会大会講演会講演要旨集(CD-ROM)   2020   2020

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  • 異なる栄養条件下における外来チドメグサ属3草種の栄養繁殖特性および開花結実特性

    藤井清佳, 中嶋佳貴, 沖陽子

    日本雑草学会大会講演要旨集   58th   2019

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  • 外来水生植物キショウブの生態と適切な管理法

    中嶋佳貴

    植調   53 ( 4 )   98 - 103   2019

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    Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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  • Microcosm Investigation on Differential Potential of Free Floating Azolla Macrophytes for Phytoremediation of P-controlled Water Eutrophication

    M. Shahbaz Akhtar, Yoko Oki, Yoshitaka Nakashima, Makoto Nishigaki, Tadashi Adachi, Takumi Kamigaki

    INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY   18 ( 1 )   204 - 212   2016

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    Language：English   Publisher：FRIENDS SCIENCE PUBL  

    Eutrophication is caused by an over enrichment of aquatic ecosystems with nutrients, principally with chronic release of phosphorus (P) from point and non-point sources, leading to nuisance algal blooms, anoxic events, impaired water quality and stubborn environmental issues. Aquatic macrophytes display an efficient phytosequestration of inorganics in plant parts due to their non-degradable nature. Serial microcosm experiments were conducted to estimate differential phytoremdiation ability of A. japonica, A. pinnata, and A. hybrid to remove P from different P-eutrophicated solutions under different incubation periods. Azolla plants showed substantial P-removal efficiency from P-eutrophicated solutions, and removed P-amounts were significantly correlated with P-accumulated in plant biomass. About 1-fold decrease in solution pH might be ascribed to fit efflux. Plants without P-hunger showed lower P-removal rates compared to P-hunger plants. A. japonica displayed highest P removal efficiency in different experiments. From these kinetic experiments, it is plausible to conclude that phytoaccumulation was the possible mechanism for P-removal, and due to fast growth, high tolerance and accumulation ability, free floating Azolla might be the best candidate among macrophytes to combat P-driven eutrophication. Results obtained will not only provide information to environmental managers to mitigate P-eutrophication but will also provide data base to scientists for their future ventures. (C) 2016 Friends Science Publishers

    DOI： 10.17957/IJAB/15.0119

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  • Microcosm Investigation on Differential Potential of Free Floating Azolla Macrophytes for Phytoremediation of P-controlled Water Eutrophication

    M. Shahbaz Akhtar, Yoko Oki, Yoshitaka Nakashima, Makoto Nishigaki, Tadashi Adachi, Takumi Kamigaki

    INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY   18 ( 1 )   204 - 212   2016

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    Language：English   Publisher：FRIENDS SCIENCE PUBL  

    Eutrophication is caused by an over enrichment of aquatic ecosystems with nutrients, principally with chronic release of phosphorus (P) from point and non-point sources, leading to nuisance algal blooms, anoxic events, impaired water quality and stubborn environmental issues. Aquatic macrophytes display an efficient phytosequestration of inorganics in plant parts due to their non-degradable nature. Serial microcosm experiments were conducted to estimate differential phytoremdiation ability of A. japonica, A. pinnata, and A. hybrid to remove P from different P-eutrophicated solutions under different incubation periods. Azolla plants showed substantial P-removal efficiency from P-eutrophicated solutions, and removed P-amounts were significantly correlated with P-accumulated in plant biomass. About 1-fold decrease in solution pH might be ascribed to fit efflux. Plants without P-hunger showed lower P-removal rates compared to P-hunger plants. A. japonica displayed highest P removal efficiency in different experiments. From these kinetic experiments, it is plausible to conclude that phytoaccumulation was the possible mechanism for P-removal, and due to fast growth, high tolerance and accumulation ability, free floating Azolla might be the best candidate among macrophytes to combat P-driven eutrophication. Results obtained will not only provide information to environmental managers to mitigate P-eutrophication but will also provide data base to scientists for their future ventures. (C) 2016 Friends Science Publishers

    DOI： 10.17957/IJAB/15.0119

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  • 雑草利用の実態と問題点 －抽水雑草キショウブの植生護岸の構成種への取り組み－

    沖 陽子, 中嶋佳貴

    雑草研究   2005

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  • 抽水雑草キショウブの植生護岸構成種への活用に関する研究

    中嶋佳貴

    岡山大学大学院自然科学研究科博士論文   2005

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  • P19 Relationship between order of node and fruit-setting characteristics of Iris pseudacorus scapes

    Nakashima Y., Oki Y.

    Journal of Weed Science and Technology. Supplement   ( 43 )   164 - 165   2004.4

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    Language：Japanese   Publisher：The Weed Science Society of Japan  

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  • P22 Effect of different cultural soil on root system development of Persicaria japonica

    Oki Y., Matsuoka Y., Nakashima Y.

    Journal of Weed Science and Technology. Supplement   ( 43 )   170 - 171   2004.4

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    Language：Japanese   Publisher：The Weed Science Society of Japan  

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  • P29 Creation of biotope by using weedy plants on artificial tidal flat in Kojima Lake

    Oki Y., Adachi T., Nakashima Y., Koutoku S., Tanaka S., Matsuoka Y.

    Journal of Weed Science and Technology. Supplement   ( 43 )   184 - 185   2004.4

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  • P30 Growth response of two species of hydrocotyle to different underground water level in planting area of artificial tidal flat

    Oki Y., Hara K., Nakashima Y.

    Journal of Weed Science and Technology. Supplement   ( 43 )   186 - 187   2004.4

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  • P21 Growth characteristics of vegetative fragments related to the vegetative reproduction of Potamogeton malaianus, submerged weed

    Oki Y., Tanaka S., Nakashima Y.

    Journal of Weed Science and Technology. Supplement   ( 43 )   168 - 169   2004.4

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  • 49 The role of the seed in which seed coat crack was generated in dehiscence of Iris pseudacorus capsules.

    Nakashima Y., Oki Y.

    Journal of Weed Science and Technology. Supplement   ( 42 )   108 - 109   2003.4

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  • P26 The relationship between nutrient removal ability of Pistia stratiotes and density control and different nitrogen and phosphorus concentration in water.

    Oki Y., Hidaka T., Nakashima Y.

    Journal of Weed Science and Technology. Supplement   ( 42 )   212 - 213   2003.4

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  • P25 The effect of different nitrogen and phosphorus concentration on growth and water purification ability of Typha latifolia.

    Oki Y., Kotoku S., Nakashima Y.

    Journal of Weed Science and Technology. Supplement   ( 42 )   210 - 211   2003.4

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  • Influences of the water level fluctuation on seedling growth of macro-emerged plants.

    Oki Y., Kotoku S., Nakashima Y.

    Journal of Weed Science and Technology. Supplement   ( 41 )   186 - 187   2002.4

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  • Seed-setting characteristics of Iris pseudacorus community under different planting method, density and years after transplanting conditions.

    Nakashima Y., Oki Y.

    Journal of Weed Science and Technology. Supplement   ( 41 )   94 - 95   2002.4

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  • Colonization pattern of submerged weeds community in open water body

    KAJIKI S., OKI Y., NAKASHIMA Y.

    46   184 - 185   2001.4

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  • The relationship between position of seed-setting, seed form and innate dormancy of Iris pseudacorus seeds

    NAKASHIMA Y., OKI Y.

    46   210 - 211   2001.4

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  • Effect of some meteorological facters on the flowering and fruit-setting characteristics of Iris pseudacorus

    NAKASHIMA Y., OKI Y.

    46   186 - 187   2001.4

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  • Evaluation of nutrient accumulation by submerged weeds community in water body

    KAJIKI S., OKI Y., NAKASHIMA Y., ADACHI T., NAGAI A.

    45   210 - 211   2000.4

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  • Annual change in aquatic vegetation in the eutrophic lake, Kojima Lake.

    Oki Y., Adachi T., Nakashima Y., Omine T., Miyabe M.

    Journal of Weed Science and Technology. Supplement   ( 38 )   246 - 247   1999.8

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  • Utilization of muddy sediment as materials for vegetation bank. (3)Field observation of the maintenance of Iris pseudacorus community planted one year ago

    NAKASHIMA Y., OKI Y.

    43   284 - 285   1998.3

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  • Utilization of muddy sediment as materials for vegetation bank. : (2)Relations between the planting ground and growth characteritics of Schoenoplectus validas

    OKI Y., OGURA Y., NAKASIMA Y.

    42   80 - 81   1997.4

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  • Utilization of muddy sediment as materials for regetation bank. (1)Effect of differences in water level on growth of Iris pseudacorus L.

    NAKASIMA Y

    Journal of Weed Science and Technology(supplement)   42 ( 別 )   78 - 79   1997.4

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Presentations

  • Development of physical control materials for submerged weeds to be placed underwater

    NAKASHIMA Yoshitaka, NAKAINE Ryo

    2023.8.30 

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    Event date： 2023.8.29 - 2023.8.31

    Language：Japanese  

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  • A Study on Utilizing Waste Solar Panel Cover Glass as Environmental Conservation Materials

    INABA Takumi, NAKASHIMA Yoshitaka, YAMAKAWA Naoya, IMAMURA Yosuke

    2023.8.30 

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    Event date： 2023.8.29 - 2023.8.31

    Language：Japanese   Presentation type：Poster presentation  

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  • Novel study of water purification capacity by combining granulated filler and aquatic plants

    KOKAWA Chisato, NAKASHIMA Yoshitaka

    2023.8.30 

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    Event date： 2023.8.29 - 2023.8.31

    Language：Japanese   Presentation type：Poster presentation  

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  • 造粒化した砕石副産物フィラーの環境保全への活用可能性

    粉川知里, 中嶋佳貴

    2022年度（第71回）農業農村工学会大会講演会  2022.8 

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  • 吉井川河口域におけるヨシ及びアイアシの生育に適した標高について

    小巻友里, 中嶋佳貴, 大嶋悠也, 沖陽子

    2022年度（第71回）農業農村工学会大会講演会  2022.8 

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  • 岡山市内における排水機場に集積する沈水雑草の実態

    中稲涼, 中嶋佳貴

    2022年度（第71回）農業農村工学会大会講演会  2022.8 

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  • 岡山市の水路水位管理に対する水生植物の影響評価および対応策検討

    稲葉匠海, 辻本久美子, 中嶋佳貴

    2022年度（第71回）農業農村工学会大会講演会  2022.8 

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  • 準絶滅危惧種アイアシ種子の休眠覚醒と発芽に及ぼす環境要因について

    小巻友里, 中嶋佳貴, 大嶋悠也, 沖陽子

    2021年度（第70回）農業農村工学会大会講演会  2021.8 

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  • 用排水路に過繁茂するトチカガミ科4草種の物理的防除法の検討

    中稲涼, 中嶋佳貴, 岸正規, 沖陽子

    2021年度（第70回）農業農村工学会大会講演会  2021.8 

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  • 秋季及び冬季におけるササバモの茎切断片の萌芽能力

    鈴木 健太郎, 中嶋 佳貴, 沖 陽子

    2021年度（第70回）農業農村工学会大会講演会  2021.8 

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  • 造粒化した砕石副産物フィラーの水質浄化能力の検討

    粉川知里, 中嶋佳貴, 沖陽子

    2021年度（第70回）農業農村工学会大会講演会  2021.8 

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  • ブラジルチドメグサの農業生態系への影響及び物理的防除法の検討

    中嶋佳貴, 藤井清佳, 沖陽子, 中田和義

    2020年度（第69回）農業農村工学会大会講演会  2020.8 

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  • ヒメガマのシュートの損傷及び冠水に対する生育反応

    鈴木 健太郎, 中嶋 佳貴, 沖 陽子

    2020年度（第69回）農業農村工学会大会講演会  2020.8 

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  • セキショウモとの混生条件下におけるナガエミクリの生育反応

    中嶋佳貴, 沖陽子, 平岡駿

    日本雑草学会第59回大会  2020.3 

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  • 淡水二枚貝を用いた児島湖の透明度改善に関する基礎研究

    荒川智之, 中嶋佳貴, 沖陽子

    2019年度（第68回）農業農村工学会大会講演会  2019.8 

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  • 汽水域におけるヨシ原の刈り取りに対する生育反応

    中嶋佳貴, 沖陽子, 金子航, 大嶋悠也, 笹田直樹

    2019年度（第68回）農業農村工学会大会講演会  2019.8 

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  • 吉井川河口部における生態系保全のための水生植物相の現状評価

    大嶋悠也, 中嶋佳貴, 沖陽子

    日本雑草学会第58回大会  2019.3 

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  • 異なる栄養条件下における外来チドメグサ属3草種の栄養繁殖特性および開花結実特性

    藤井清佳, 中嶋佳貴, 沖陽子

    日本雑草学会第58回大会  2019.3 

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  • 沈水植物及び淡水二枚貝類が水質に与える影響について

    國米教生, 中嶋佳貴, 沖陽子

    日本雑草学会第58回大会  2019.3 

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  • 沈水植物トチカガミ科3草種のキレモの栄養繁殖特性

    岸正規, 中嶋佳貴, 沖陽子

    日本雑草学会第58回大会  2019.3 

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  • 都市型ビオトープにおける雑草植生を活用した緑化の評価

    第48回日本緑化工学会大会  2017 

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  • Effect of extensive management to succession in artificial tidal flat at Kojima Lake.

    2017 

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  • Evaluation of greening by using weed vegetation in urban-type biotope

    2017 

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  • 児島湖人工干潟における植生管理の粗放化が植生遷移に与える影響

    日本雑草学会第５６回講演会  2017 

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  • 都市型ビオトープに発生するヒメガマ及びヨシの適正管理に関与する刈取り方法の検討

    第47回日本緑化工学会大会  2016 

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  • Studies on cutting treatments for proper management of Typha angustifolia and Phragmites australis in urban-type biotope.

    2016 

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  • 二級河川における人為的撹乱が沈水雑草ササバモ群落の消失に与える環境要因について

    日本雑草学会第５５回講演会  2016 

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  • 海岸のモザイク状環境におけるエノコログサの形態と耐塩性の変異～鳴門岬の例

    日本雑草学会第５５回講演会  2016 

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  • 児島湖流域における水質汚濁の現況の時期別並びに経年変化の解析

    平成28年度農業農村工学会大会講演会  2016 

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  • 沈水植物セキショウモを介した水中及び底質間におけるリン濃度の変化

    平成28年度農業農村工学会大会講演会  2016 

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  • Phosphorus starvation induced variations in growth response, and P-acquisition and use efficiency from sparingly soluble P-sources by wheat cultivars.

    14th International Symposium for soil and Plant Analysis.  2015 

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  • "海岸のモザイク状環境におけるエノコログサの形態と耐塩性の変異 瀬戸内海の島の例"

    日本雑草学会第５４回講演会  2015 

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  • エノコログサの海岸集団および内陸集団における種子休眠特性

    日本雑草学会第５４回講演会  2015 

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  • Differential P-acquisition and Growth Characteristics of Wheat Cultivars under Buffered P-stress Environment.

    5th International Conference on Agriculture and Environmental Engineering  2015 

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  • 二級河川における自然攪乱と沈水雑草分布の長期観測

    平成27年度農業農村工学会大会講演会  2015 

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  • 錦海塩田跡地におけるアッケシソウ群落及びヨシ群落成立要因の解明

    平成27年度農業農村工学会大会講演会  2015 

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  • 児島湖流域における灌漑期・非灌漑期別水質変動の現況について

    平成27年度農業農村工学会大会講演会  2015 

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  • 環境植物サンパチェンスを用いた花筏の改良・開発の検討

    平成27年度農業農村工学会大会講演会  2015 

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  • 塩田跡地に自生するヨシの適応戦略に関する基礎研究

    日本雑草学会第５３回講演会  2014 

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  • エノコログサの海岸集団および内陸集団における施肥反応

    日本雑草学会第５３回講演会  2014 

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  • 農業用排水路におけるシュロガヤツリ植栽筏を用いた水質浄化方法の検討

    日本雑草学会第５３回講演会  2014 

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  • Microcosm investigation on phytoremediation of copper and zinc by using Azolla pinnata and Azolla japonica

    日本雑草学会第５３回講演会  2014 

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  • エノコログサにおける形態の変異 海岸集団と内陸集団の比較

    日本雑草学会第５３回講演会  2014 

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  • エノコログサにおける耐塩性の変異 海岸集団と内陸集団の比較

    日本雑草学会第５３回講演会  2014 

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  • 農業用水路における浮島栽培土に用いる土性の差異がシュロガヤツリの水質浄化能力に及ぼす影響

    日本雑草学会第５２回講演会  2013 

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  • 岡山市街地の地域用水における沈水雑草の発生分布状況

    日本雑草学会第５２回講演会  2013 

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  • 二級河川における攪乱と沈水雑草の種組成との関係

    日本雑草学会第５２回講演会  2013 

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  • 岡山市南部における沈水雑草Lagarosiphon majorの発生分布状況

    日本雑草学会第５１回講演会  2012 

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  • 用排水路に設置した植栽マットに自然発生した雑草群落

    日本雑草学会第５１回講演会  2012 

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  • 二級河川における台風襲来と沈水雑草群落の流失および定着との関係

    日本雑草学会第５１回講演会  2012 

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  • セリ科3 草種の横走茎外部形態と栄養繁殖特性との関係

    日本雑草学会第５０回講演会  2011 

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  • 用排水路における環境に優しい水質浄化法の検討

    日本雑草学会第５０回講演会  2011 

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  • 成熟程度の異なるブラジルチドメグサ種子の休眠性

    日本雑草学会第５０回講演会  2011 

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  • スラグがサワスズメノヒエの生育に及ぼす影響とその軽減方法の検討

    日本雑草学会第４９回講演会  2010 

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  • ブラジルチドメグサの伝播・繁殖に関わる横走茎切断片の生育特性

    日本雑草学会第４９回講演会  2010 

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  • 水田雑草及び作物の水質浄化能力における季節性の比較

    日本雑草学会第４９回講演会  2010 

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  • フトイの抗菌作用に関する基礎研究

    日本雑草学会第４９回講演会  2010 

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  • ヨシ群落保全のための維持管理法に関する提言

    日本雑草学会第４９回講演会  2010 

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  • ボタンウキクサの栄養塩類濃度に対する生育特性の系統間差異

    日本雑草学会第４８回講演会  2009 

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  • 時期および回数の異なる刈取りがヨシの群落形成に及ぼす影響

    日本雑草学会第４８回講演会  2009 

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  • サワスズメノヒエの根系の発達に及ぼすスラグの影響

    日本雑草学会第４８回講演会  2009 

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  • 放棄水田の雑草及び作物の水質浄化能に関する基礎的研究

    日本雑草学会第４８回講演会  2009 

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  • キショウブの群落管理に有効な刈取処理の時期と水位条件について

    日本雑草学会第４８回講演会  2009 

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  • ヨシ群落の維持管理法

    ヨシ群落の維持管理法  2009 

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  • 水と人の環境史

    60周年記念事業  2009 

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  • ボタンウキクサの系統による葉型の差異とその季節的変動

    日本雑草学会第４８回講演会  2009 

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  • 堪水・湿土条件がボタンウキクサの実生生育に与える影響

    日本雑草学会第４８回講演会  2009 

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  • 水位条件が児島湖人工干潟のヨシ群落のバイオマスに与える影響

    日本雑草学会第４７回講演会  2008 

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  • ボタンウキクサの花芽形成に関与する環境要因

    日本雑草学会第４７回講演会  2008 

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  • ボタンウキクサの耐寒性に関与する温度要因

    日本雑草学会第４７回講演会  2008 

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  • 主成分分析を用いた岡山県南部における水生雑草の発生環境要因の解析

    日本雑草学会第４７回講演会  2008 

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  • 種々の土壌水分条件下におけるセリ科3草種の耐寒性について

    日本雑草学会第４７回講演会  2008 

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  • ブラジルチドメグサの防除に関する基礎研究

    日本雑草学会第４７回講演会  2008 

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  • 児島湖共同研究事業「児島湖人工干潟における沿岸帯植物群落の水質浄化能力及び有機物堆積の実証調査」

    第１８回「地域と下水道のふれあいデー」  2008 

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  • 児島湖共同研究事業「児島湖人工干潟における沿岸帯植物群落の水質浄化能力及び有機物堆積の実証調査」

    エコフェスタ おかやま2008  2008 

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  • 刈取処理がキショウブの生育に及ぼす影響

    日本雑草学会第４７回講演会  2008 

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  • 児島湖人工干潟における水生雑草群落が貝類生息分布に与える影響

    日本雑草学会第４６回講演会  2007 

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  • 日本に繁茂する特定外来種ボタンウキクサはすべて同一種？

    日本雑草学会第４６回講演会  2007 

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  • 岡山県南部のため池に分布する水生在来種・外来種の発生環境の特徴

    日本雑草学会第４６回講演会  2007 

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  • 管理体系に必要なキショウブ群落の春季植栽時における外部形態と開花との関係

    日本雑草学会第４６回講演会  2007 

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  • ボタンウキクサの密度管理による防除体系の検討

    日本雑草学会第４６回講演会  2007 

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  • 渚型護岸におけるヒメガマ・フトイ・ヨシ群落の機能評価

    日本雑草学会第４６回講演会  2007 

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  • 岡山県南部における水系別水生雑草発生分布と水質について

    日本雑草学会第４５回講演会  2006 

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  • 採石跡地の法肩及び法尻におけるクズの定着に影響を及ぼす環境要因について

    日本雑草学会第４５回講演会  2006 

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  • バーナー除草機の開発に関する基礎研究

    日本雑草学会第４５回講演会  2006 

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  • 人工干潟におけるキショウブ群落発達に関与する植裁法と微環境

    日本雑草学会第４４回講演会  2005 

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  • ツルヨシ走出茎の発生様式と日長との関係

    日本雑草学会第４４回講演会  2005 

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  • 採石跡地における植生回復にクズ実生苗を活用する試み

    日本雑草学会第４４回講演会  2005 

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  • 抽水雑草キショウブの植生護岸の構成種への取り組み

    日本雑草学会第４４回講演会 小集会３ 雑草利用研究会「雑草利用の実態と問題点」  2005 

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  • 人工干潟における植栽立地条件がセリ科２草種の群落発達及び内部構造に及ぼす影響

    日本雑草学会第４４回講演会  2005 

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  • シロバナサクラタデの根系発達に伴う植栽土壌の理化学性の変化

    日本雑草学会第４４回講演会  2005 

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  • キショウブ朔果の裂開時に存在する種皮亀裂が生じた種子の役割

    日本雑草学会第４３回講演会  2004 

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  • 異なる植栽土壌がシロバナサクラタデの根系発達に及ぼす影響

    日本雑草学会第４３回講演会  2004 

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  • 児島湖人工干潟における雑草を活用したビオトープ創出の試み

    日本雑草学会第４３回講演会  2004 

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  • 人工干潟の地下水位が異なる植栽地におけるセリ科２草種の生育反応

    日本雑草学会第４３回講演会  2004 

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  • 沈水雑草ササバモの増殖に関与するキレモの生育特性

    日本雑草学会第４３回講演会  2004 

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  • キショウブ朔果の裂開時に存在する種皮亀裂が生じた種子の役割

    日本雑草学会第４２回講演会  2003 

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  • 異なる水中の窒素・リン濃度がガマの生育および水質浄化能に及ぼす影響

    日本雑草学会第４２回講演会  2003 

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  • ボタンウキクサの水質浄化特性と水中の窒素・リン濃度及び密度管理の関係

    日本雑草学会第４２回講演会  2003 

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  • 植栽方法、密度及び年数の異なるキショウブ群落における種子生産特性

    日本雑草学会第４１回講演会  2002 

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  • 大型抽水植物の実生の生育と水位との関係

    日本雑草学会第４１回講演会  2002 

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  • キショウブの開花結実特性に関与する気象要因について

    日本雑草学会第４０回講演会  2001 

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  • キショウブ種子の一次休眠と着生位置および種子型との関係

    日本雑草学会第４０回講演会  2001 

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  • 開放水系における沈水雑草群落の定着パターン

    日本雑草学会第４０回講演会  2001 

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  • キショウブ種子成熟程度と休眠性との関係

    日本雑草学会第３９回講演会  2000 

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  • 沈水雑草群落による水系の栄養塩類蓄積量の評価

    日本雑草学会第３９回講演会  2000 

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  • 富栄養湖における植生の年次変動 －児島湖の場合ー

    日本雑草学会第３８回講演会  1999 

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  • ヘドロを植生護岸の基盤資材として活用する基礎研究 （４）覆砂処理によるキショウブの生育差異について

    日本雑草学会第３８回講演会  1999 

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  • キショウブ種子の異なる貯蔵条件下における休眠覚醒の経時的変化

    日本雑草学会第３８回講演会  1999 

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  • ヘドロを植生護岸の基盤資材として活用する基礎研究 （３）キショウブの植栽１年後の群落維持について

    日本雑草学会第３７回講演会  1998 

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  • キショウブ種子の休眠覚醒と発芽に及ぼす環境要因について

    日本雑草学会第３７回講演会  1998 

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  • ヘドロを植生護岸の基盤資材として活用する基礎研究 （２）生育基盤層とフトイの生育特性との関係

    日本雑草学会第３６回講演会  1997 

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  • ヘドロを植生護岸の基盤資材として活用する基礎研究 （１）植生護岸の水位条件がキショウブの生育に及ぼす影響

    日本雑草学会第３６回講演会  1997 

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Research Projects

  • 太陽光パネルカバーガラスのリサイクル資源としての活用可能性の探索

    2021.10

    平林金属株式会社 

    中嶋佳貴

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    Authorship：Principal investigator  Grant type：Collaborative (industry/university)

    Grant amount：\600000

  • 採石場で発生するフィラーの有効活用

    2020.04

    東洋砕石工業株式会社 

    中嶋佳貴

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    Authorship：Principal investigator  Grant type：Collaborative (industry/university)

    Grant amount：\1708000

  • 淡水真珠の養殖による持続的な湖沼水質の透明度改善手法に係る調査研究業務

    2018.04 - 2020.03

    公益財団法人　児島湖流域水質保全基金  公益財団法人　児島湖流域水質保全基金 

    沖陽子，中嶋佳貴

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    Authorship：Coinvestigator(s)  Grant type：Collaborative (industry/university)

    Grant amount：\3117000

  • 吉井川河口部における干潟の保全・再生のための実証研究

    2018.04 - 2020.03

    国土交通省中国地方整備局 

    中嶋佳貴

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    Authorship：Principal investigator  Grant type：Collaborative (industry/university)

    Grant amount：\21731000

  • 富栄養湖における生態系サービスに資する水生植物相の再生及び創出

    2018.04 - 2019.03

    八雲環境科学振興財団  八雲環境科学振興財団環境研究助成 

    中嶋佳貴

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    Authorship：Principal investigator  Grant type：Collaborative (industry/university)

    Grant amount：\500000

  • 児島湖人工干潟における植生遷移並びに生物多様性を展開するメカニズムの解析

    2016.04 - 2017.03

    ウエスコ学術振興財団  ウエスコ学術振興財団研究活動費助成事業 

    中嶋佳貴

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    Authorship：Principal investigator  Grant type：Collaborative (industry/university)

    Grant amount：\300000

  • Tidal flat development trial utilizing dredged sludge and aquatic weeds in an eutrophic closed water system.

    Grant number：16380161  2004 - 2007

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

    OKI Yoko, ADACHI Tadashi, WATANABE Masaji, NAKASHIMA Yoshitaka

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    Grant amount：\15970000 （ Direct expense: \15700000 、 Indirect expense：\270000 ）

    This study attempts creation of a biotope and reduction in water pollution by developing aquatic weed community in an artificial tidal flat using dredged sludge in Lake Kojima located in southern Okayama Prefecture, where nutrient enrichment has advanced. Changes in physical and chemical factors affecting the tidal flat are grasped to predict the material balance between living things in the tidal flat, water systems, and bottom sludge. We propose continued operation and maintenance of the biotope. Results obtained are described below.
    1. Basic study related to creation and development of ecosystem in tidal flat developed land : Results of surveys of community development of planting species in a natural state revealed that Zizania latifolia, Schoenoplectus validus, and Typha angustifolia developed the community and formed a vegetation revetment. Furthermore, the larger the plant community, the more shellfish reside there. Submerged plants were planted in porous ceramics to develop a planting method.
    2. Grasping of formation processes of physical and chemical factors of tidal flat developed land : Measurements of EC and pH of the soil at the fresh water side from the waterfront line were higher than those at the continental area, both at the surface layer and 5cm below ground. Although sediment and local scour are generated according to the presence or absence of typhoons, development of the underground parts of plant communities made a great contribution.
    3. Survey of the pollution load from farmland flowing into Lake Kojima : Although the farmland has nitrogen reduction action, loading of phosphorus to the outside tends to increase concomitantly with increased amounts of applied fertilizer and precipitation.
    4. Survey of distribution of aquatic weeds and water pollution in Lake Kojima : Although mass generation of Trapa japonica occurred annually, no indication of regrowth of submerged plants was recognized. Regarding water quality, no tendency of phosphorus reduction was noticed.
    5. Model analysis of tidal flat developed land by data processing : Flows generated around an artificial tidal flat in Lake Kojima were analyzed quantitatively.
    As described above, establishment of an ecosystem according to its food chain, accumulation of organic substances, and purification of water quality were confirmed by planting of large aquatic weeds in the artificial tidal flat. However, based on these results, proposal of a method of operation and maintenance of the biotope is premature.

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  • Selection of available weedy plants as a cover plant on slope and their function of soil erosion prevention.

    Grant number：15380166  2003 - 2006

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

    ADACHI Tadashi, OKI Yoko, NAGAI Akihiko, CHIKAMORI Hidetaka, NAKASHIMA Yoshitaka

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    Grant amount：\14100000 （ Direct expense: \14100000 ）

    From a viewpoint of the difference of the life form of a cover plant, we evaluated the effect which the life form of a cover plant on slope exerts on soil erosion prevention. It measured the surface runoff and the soil loss for every rain on slope composed of Masa soil with 10 inclinations, which the introductory board and water tank were installed in the lower end of the examination frame of 2m (W) x 5m (L). We set up five plots. Four of these plots were a cover plant plots vegetated with Cynondon dactylon Pers., Dichondra repens Forest and Artemisia princes Pampan, from which it is thought that the adaptation power to severe environment is high, and a life form differs. The other one was a bare surface plot as a control plot. The obtained results were as follows.
    (1)The dangerous rainy season is in May-November. Even when it is little year precipitation, if the frequency of rain such as more than 3mm/lOmin is high, the amount of soil loss increased.
    (2)Although the amount of soil loss of a bare surface plot was the full limits of the maximum permissible dose of our country, in a Artemisia princes plot and Cynondon dactylon plot, it is the amount of soil loss below the maximum permissible dose. Therefore the effect of a cover plant on the soil erosion prevention on slope was able to check and quantify it. Among the species, Artemisia princes, straight life form, was excellent. This tendency was also the same of the following phenomena.
    (3)It was shown clearly that increase of the amount of penetration of rain into soil and reduction of surface runoff occurred because of increase of the soil vacancy by the root system and also increase of the soil coarse vacancy by formation of soil aggregate due to humus.
    (4)CEC of soil increased with increase of humus, and there are the further development of soil structure and an effect of improving soil environment to the suitable habitat for growth of a cover plant.
    (5)The pH neutralization effect of the acid rain by a cover plant was accepted, and not only the soil erosion prevention effect but the effect which mitigates the influence of the ecosystem on air environment deterioration has been checked.

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Media Coverage

  • 各地で問題に…増えすぎた「オオカナダモ」を取り除け！ 岡山大学などが実証実験 成果は？ TV or radio program

    瀬戸内海放送  KSBニュース  https://news.ksb.co.jp/article/14878444  2023.4.5

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Academic Activities

  • 日本雑草学会創立60周年記念シンポジウム

    Role(s)：Planning, management, etc.

    日本雑草学会  2021.12.11

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    Type：Competition, symposium, etc.