Updated on 2025/07/17

写真a

 
HIROBE Muneto
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
Homepage
https://www.okayama-u.ac.jp/user/planteco/
External link

Degree

  • 博士（農学） ( 京都大学 )

Research Interests

  • 森林・物質循環・土壌

  • Forest Ecology / Nutrient Cycling

Research Areas

  • Life Science / Forest science

Professional Memberships

 

Papers

  • Chemical composition of essential oil of Acacia crassicarpa Benth. (Fabaceae) from Vietnam Reviewed

    Tuan Quoc Doan, Tai Tien Dinh, Tetsuya K. Matsumoto, Dien Dinh, Naoko Miki, Muneto Hirobe, Hoai Thi Nguyen

    Bulletin of the Chemical Society of Ethiopia   39 ( 8 )   1653 - 1660   2025.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：African Journals Online (AJOL)  

    This research aimed to identify the volatile compounds found in the fresh leaves of Acacia crassicarpa Benth. This is the first phytochemical investigation of this species. Essential oils from the leaves of A. crassicarpa were obtained by hydro-distillation and analyzed by gas chromatography coupled with mass spectrometry (GC/MS). Sixty-one compounds accounting for 95.8% of the leaf oil were identified. The classes of compounds identified in the oil sample were aldehydes (30.7%), sesquiterpene hydrocarbons (25.2%), alkanes (19.1%), oxygenated monoterpenes (3.6%) oxygenated sesquiterpenes (2.3%), monoterpene hydrocarbons (0.8%) and others (14.2%). The major constituents in the leaf oil were tridecanal (24.5%), (E)-caryophyllene (11.7%), n-heneicosane (7.2%), squalene (6.5%), and 7-tetradecenal (5.9%).
    KEY WORDS: Acacia crassicarpa, Essential oil, Tridecanal, (E)-Caryophyllene
    Bull. Chem. Soc. Ethiop. 2025, 39(8), 1653-1660.                                                      
    DOI: https://dx.doi.org/10.4314/bcse.v39i8.15

    DOI： 10.4314/bcse.v39i8.15

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  • The Impact of Phenological Gaps on Leaf Characteristics and Foliage Dynamics of an Understory Dwarf Bamboo, Sasa kurilensis Reviewed International coauthorship

    Chongyang Wu, Ryota Tanaka, Kyohei Fujiyoshi, Yasuaki Akaji, Muneto Hirobe, Naoko Miki, Juan Li, Keiji Sakamoto, Jian Gao

    Plants   13 ( 5 )   719 - 719   2024.3

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

    Phenological gaps exert a significant influence on the growth of dwarf bamboos. However, how dwarf bamboos respond to and exploit these phenological gaps remain enigmatic. The light environment, soil nutrients, leaf morphology, maximum photosynthetic rate, foliage dynamics, and branching characteristics of Sasa kurilensis were examined under the canopies of Fagus crenata and Magnolia obovata. The goal was to elucidate the adaptive responses of S. kurilensis to phenological gaps in the forest understory. The findings suggest that phenological gaps under an M. obovata canopy augment the available biomass of S. kurilensis, enhancing leaf area, leaf thickness, and carbon content per unit area. However, these gaps do not appreciably influence the maximum photosynthetic rate, total leaf number, leaf lifespan, branch number, and average branch length. These findings underscore the significant impact of annually recurring phenological gaps on various aspects of S. kurilensis growth, such as its aboveground biomass, leaf morphology, and leaf biochemical characteristics. It appears that leaf morphology is a pivotal trait in the response of S. kurilensis to phenological gaps. Given the potential ubiquity of the influence of phenological gaps on dwarf bamboos across most deciduous broadleaf forests, this canopy phenomenon should not be overlooked.

    DOI： 10.3390/plants13050719

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  • Two closely related species of the Arisaema ovale group (Araceae) selectively attract male fungus gnats of different Anatella species (Diptera: Mycetophilidae) Reviewed

    Tetsuya K. Matsumoto, Masahiro Sueyoshi, Shigetaka Sakata, Yuko Miyazaki, Muneto Hirobe

    Plant Systematics and Evolution   309   4   2023.1

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    DOI： 10.1007/s00606-022-01839-7

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  • Gall midge pollination and ant-mediated fruit dispersal of Pinellia tripartita (Araceae) Reviewed

    Tetsuya K. Matsumoto, Motoya Onoue, Takashi Miyake, Kentaro Ohnishi, Kiyoto Takazoe, Muneto Hirobe, Yuko Miyazaki

    Plant Ecology   2022.12

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s11258-022-01278-x

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    Other Link： https://link.springer.com/article/10.1007/s11258-022-01278-x/fulltext.html

  • Spatial and functional niche overlap between invasive Ligustrum lucidum and native woody species in an urban shrine forest in Japan Reviewed

    H. Roaki Ishii, Chinatsu Hara, Keita Kashiwagi, Momoko Okabe, Yuiko Noguchi, Muneto Hirobe

    Landscape and Ecological Engineering   18 ( 1 )   1 - 10   2022.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11355-021-00474-7

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    Other Link： https://link.springer.com/article/10.1007/s11355-021-00474-7/fulltext.html

  • Life history of Juniperus sabina L. adapted to the sand shifting environment in the Mu Us Sandy Land, China: A review Reviewed

    Nobuhito Ohte, Naoko H. Miki, Naoko Matsuo, Lingli Yang, Muneto Hirobe, Norikazu Yamanaka, Yoshiaki Ishii, Ayumi Tanaka-Oda, Michiko Shimizu, Guosheng Zhang, Keiji Sakamoto, Linhe Wang, Ken Yoshikawa

    Landscape and Ecological Engineering   17   281 - 294   2021.7

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s11355-021-00453-y

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    Other Link： http://link.springer.com/article/10.1007/s11355-021-00453-y/fulltext.html

  • Effects of large-scale forest fire followed by illegal logging on the regeneration of boreal forests in Mongolia Reviewed International coauthorship

    Keiji Sakamoto, Misaki Tomonari, Uyanga Ariya, Erika Nakagiri, Tetsuya K. Matsumoto, Yasuaki Akaji, Takashi Otoda, Muneto Hirobe, Baatarbileg Nachin

    Landscape and Ecological Engineering   17   267 - 279   2021.7

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s11355-021-00457-8

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    Other Link： https://link.springer.com/article/10.1007/s11355-021-00457-8/fulltext.html

  • Selective pollination by fungus gnats potentially functions as an alternative reproductive isolation among five Arisaema species Reviewed International journal

    Tetsuya K Matsumoto, Muneto Hirobe, Masahiro Sueyoshi, Yuko Miyazaki

    Annals of Botany   127 ( 5 )   633 - 644   2021.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    <title>Abstract</title>
    <sec>
    <title>Background and Aims</title>
    Interspecific difference in pollinators (pollinator isolation) is important for reproductive isolation in flowering plants. Species-specific pollination by fungus gnats has been discovered in several plant taxa, suggesting that they can contribute to reproductive isolation. Nevertheless, their contribution has not been studied in detail, partly because they are too small for field observations during flower visitation. To quantify their flower visitation, we used the genus Arisaema (Araceae) because the pitcher-like spathe of Arisaema can trap all floral visitors.


    </sec>
    <sec>
    <title>Methods</title>
    We evaluated floral visitor assemblage in an altitudinal gradient including five Arisaema species. We also examined interspecific differences in altitudinal distribution (geographic isolation) and flowering phenology (phenological isolation). To exclude the effect of interspecific differences in altitudinal distribution on floral visitor assemblage, we established ten experimental plots including the five Arisaema species in high- and low-altitude areas and collected floral visitors. We also collected floral visitors in three additional sites. Finally, we estimated the strength and contribution of these three reproductive barriers using a unified formula for reproductive isolation.


    </sec>
    <sec>
    <title>Key Results</title>
    Each Arisaema species selectively attracted different fungus gnats in the altitudinal gradient, experimental plots and additional sites. Altitudinal distribution and flowering phenology differed among the five Arisaema species, whereas the strength of geographic and phenological isolations were distinctly weaker than those in pollinator isolation. Nevertheless, the absolute contribution of pollinator isolation to total reproductive isolation was weaker than geographic and phenological isolations, because pollinator isolation functions after the two early-acting barriers in plant life history.


    </sec>
    <sec>
    <title>Conclusions</title>
    Our results suggest that selective pollination by fungus gnats potentially contributes to reproductive isolation. Since geographic and phenological isolations can be disrupted by habitat disturbance and interannual climate change, the strong and stable pollinator isolation might compensate for the weakened early-acting barriers as an alternative reproductive isolation among the five Arisaema species.


    </sec>

    DOI： 10.1093/aob/mcaa204

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    Other Link： http://academic.oup.com/aob/article-pdf/127/5/633/37118519/mcaa204.pdf

  • Spatial distribution of mercury accumulation in the surface soil of Japanese forests Reviewed

    Takaya Chikamasa, Hideaki Shibata, Rieko Urakawa, Karibu Fukuzawa, Muneto Hirobe, Yoshiyuki Inagaki

    Journal of Forest Research   26 ( 2 )   161 - 167   2021.3

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    DOI： 10.1080/13416979.2020.1865510

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  • Population structures and spatial patterns of two unpalatable Arisaema species (Araceae) with and without clonal reproduction in riparian forest intensively grazed by Sika deer Reviewed

    Matsumoto TK, Hirobe M, Akaji Y, Miyazaki Y

    Journal of Forestry Research   31   155 - 162   2020

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  • Pre-pollination barriers between two sympatric Arisaema species in northern Shikoku Island, Japan Reviewed

    Matsumoto, Tetsuya K., Miyazaki, Yuko, Sueyoshi, Masahiro, Senda, Yoshihiro, Yamada, Kazuhiro, Hirobe, Muneto

    AMERICAN JOURNAL OF BOTANY   2019.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/ajb2.1389

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  • Survival and recruitment of Sasa kurilensis culms in response to local light conditions in a cool temperate forest Reviewed

    Akaji Yasuaki, Fujiyoshi Kyohei, Wu Chongyang, Hattori Itsuka, Hirobe Muneto, Sakamoto Keiji

    JOURNAL OF FOREST RESEARCH   24 ( 6 )   365 - 370   2019.10

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  • Environmental factors affecting community structure of Sasa kurilensis in the understory of a beech forest Reviewed

    呉 崇洋, 田中 凌太, 藤好 恭平, 服部 一華, 赤路 康朗, 廣部 宗, 坂本 圭児

    日本緑化工学会誌   45 ( 1 )   103 - 108   2019.8

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    Language：Japanese   Publisher：日本緑化工学会  

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  • Stump sprout dynamics of Quercus serrata Thunb. and Q. acutissima Carruth. four years after cutting in an abandoned coppice forest in western Japan Reviewed

    Tai Tien Dinh, Kajikawa Chihiro, Akaji Yasuaki, Yamada Kazuhiro, Matsumoto Tetsuya K, Makimoto Takushi, Miki Naoko H, Hirobe Muneto, Sakamoto Keiji

    FOREST ECOLOGY AND MANAGEMENT   435   45 - 56   2019.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.foreco.2018.12.034

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  • A water acquisition strategy may regulate the biomass and distribution of winter forage species in cold Asian rangeland Reviewed

    Tanaka-Oda Ayumi, Endo Izuki, Ohte Nobuhito, Eer Deni, Yamanaka Norikazu, Hirobe Muneto, Nachinshonhor G. U, Koyama Asuka, Jambal Sergelenkhuu, Katsuyama Masanori, Nakamura Takashi, Matsuo Naoko, Jamsran Undarmaa, Okuro Toshiya, Yoshikawa Ken

    ECOSPHERE   9 ( 12 )   2018.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/ecs2.2511

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  • Sprouting capacity of Quercus serrata Thunb. and Quercus acutissima Carruth. after cutting canopy trees in an abandoned coppice forest Reviewed

    Tai Tien Dinh, Yasuaki Akaji, Tetsuya Matsumoto, Takumi Toribuchi, Takushi Makimoto, Muneto Hirobe, Keiji Sakamoto

    JOURNAL OF FOREST RESEARCH   23 ( 5 )   287 - 296   2018

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/13416979.2018.1498288

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  • Survival and growth of Fagus crenata seedlings in relation to biological and microtopographical factors in a cool temperate broadleaf forest Reviewed

    Yasuaki Akaji, Muneto Hirobe, Yuko Miyazaki, Takushi Makimoto, Shu Kinoshita, Itsuka Hattori, Keiji Sakamoto

    JOURNAL OF FOREST RESEARCH   22 ( 5 )   294 - 302   2017

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/13416979.2017.1354749

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  • Temporal and spatial dynamics of an old-growth beech forest in western Japan Reviewed

    Uyanga Ariya, Ken-Ya Hamano, Takushi Makimoto, Shu Kinoshita, Yasuaki Akaji, Yuko Miyazaki, Muneto Hirobe, Keiji Sakamoto

    JOURNAL OF FOREST RESEARCH   21 ( 2 )   73 - 83   2016.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s10310-015-0514-1

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  • The relationship between seedling survival rates and their genetic relatedness to neighboring conspecific adults Reviewed

    Yasuaki Akaji, Yuko Miyazaki, Muneto Hirobe, Takushi Makimoto, Keiji Sakamoto

    PLANT ECOLOGY   217 ( 4 )   465 - 470   2016.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11258-016-0591-z

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  • Changes in aboveground and belowground properties during secondary natural succession of a cool-temperate forest in Japan Reviewed

    Hyodo, F., Haraguchi, T.F., Hirobe, M., Tateno, R.

    Journal of Forest Research   21 ( 4 )   170 - 177   2016

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s10310-016-0526-5

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  • The spatial distributions of understory trees in relation to dwarf bamboo cover in a cool-temperate deciduous broadleaf forest in Japan Reviewed

    Muneto Hirobe, Sho Miyamoto, Keiji Sakamoto, Junji Kondo, Takashi Otoda, Yasuaki Akaji, Norikazu Yamanaka

    JOURNAL OF FOREST RESEARCH   20 ( 3 )   357 - 362   2015.6

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    DOI： 10.1007/s10310-015-0480-7

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  • Effects of Juniperus sabina L. and soil surface environmental conditions on stand structure of Artemisia ordosica Krasch. on fixed sand dune in semiarid area, China Reviewed

    MATSUMOTO Tetsuya, MIKI H. Naoko, HIROBE Muneto, ZHANG GuoSheng, WANG LinHe, YOSHIKAWA Ken

    Journal of the Japanese Society of Revegetation Technology   41 ( 1 )   56 - 61   2015

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    Language：Japanese   Publisher：JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY  

    We investigated the effect of soil surface environmental conditions on the stand structure of Artemisia ordosica Krasch., which is a deciduous semi shrub and one of the revegetation plant in semiarid area, China. The effect of Juniperus sabina L., which has prostrate life-form and often distributed with A. ordosica was also considered. Individual density, position, size, existence of fruits, and soil surface conditions were measured. The results suggested that both species exclude with each other and the A. ordosica community on the fixed sand dune was influenced by the competition to get the resources with J. sabina rather than the nutrient conditions of soil surface.

    DOI： 10.7211/jjsrt.41.56

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  • Reconstruction of establishment process in a secondary deciduous broad-leaved forest by tree ring analysis Reviewed

    USUDA Masumi, MAKIMOTO Takushi, AKAJI Yasuaki, HIROBE Muneto, SAKAMOTO Keiji

    Journal of the Japanese Society of Revegetation Technology   41 ( 1 )   103 - 108   2015

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    Language：Japanese   Publisher：JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY  

    We estimated establishment process of the secondary deciduous broad-leaved forest, based on the establishment and growth processes of dominant tree species detected by tree ring analysis. In the period of coppicing, many trees frequently showed releases, which suggest many remaining individuals abruptly grew by the disturbance of coppicing. Around the beginning of the abandonment, it is likely that Quercus serrata and Prunus jamasakura were most frequently established. Ratios of individuals showing suppressed growth increased in the succession after the abandonment. On the other hand, releases discontinuously occurred, which suggests disturbances by fallen trees occurred in the process of succession.

    DOI： 10.7211/jjsrt.41.103

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  • Effects of livestock grazing on the spatial heterogeneity of net soil nitrogen mineralization in three types of Mongolian grasslands Reviewed

    Muneto Hirobe, Junji Kondo, Altangerel Enkhbaatar, Narantsetseg Amartuvshin, Noboru Fujita, Keiji Sakamoto, Ken Yoshikawa, Knut Kielland

    JOURNAL OF SOILS AND SEDIMENTS   13 ( 7 )   1123 - 1132   2013.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11368-013-0702-6

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  • Frequent fires may alter the future composition of the boreal forest in northern Mongolia Reviewed

    Takashi Otoda, Takahiro Doi, Keiji Sakamoto, Muneto Hirobe, Baatarbileg Nachin, Ken Yoshikawa

    Journal of Forest Research   18 ( 3 )   246 - 255   2013.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s10310-012-0345-2

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  • Nitrate-use traits of understory plants as potential regulators of vegetation distribution on a slope in a Japanese cedar plantation Reviewed

    Lina Koyama, Muneto Hirobe, Keisuke Koba, Naoko Tokuchi

    PLANT AND SOIL   362 ( 1-2 )   119 - 134   2013.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11104-012-1257-9

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  • Influences of anthropogenic disturbances on the dynamics of white birch (Betula platyphylla) forests at the southern boundary of the Mongolian forest-steppe Reviewed

    Takashi Otoda, Keiji Sakamoto, Muneto Hirobe, Jamsran Undarmaa, Ken Yoshikawa

    Journal of Forest Research   18 ( 1 )   82 - 92   2013

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s10310-011-0324-z

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  • Microphysical environmental factors affecting the local distribution of dwarf bamboo (Sasa palmata) in a cool-temperate deciduous broadleaf forest in Japan Reviewed

    Yasuaki Akaji, Muneto Hirobe, Miho Harada, Takashi Otoda, Norikazu Yamanaka, Keiji Sakamoto

    ECOSCIENCE   20 ( 4 )   339 - 344   2013

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2980/20-4-3640

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  • 列状間伐4年後のヒノキ人工林における下層木本群落構造と立地環境ー斜面方位による比較ー Reviewed

    廣部 宗, 糸原まりな, 近藤順治, 音田高志, 赤路康朗, 牧本卓史, 坂本圭児

    森林応用研究   22 ( 1 )   7 - 14   2013

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  • Colonization and community structure of root-associated microorganisms of Sabina vulgaris with soil depth in a semiarid desert ecosystem with shallow groundwater Reviewed

    Takeshi Taniguchi, Hiroyuki Usuki, Junichi Kikuchi, Muneto Hirobe, Naoko Miki, Kenji Fukuda, Guosheng Zhang, Linhe Wang, Ken Yoshikawa, Norikazu Yamanaka

    MYCORRHIZA   22 ( 6 )   419 - 428   2012.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s00572-011-0417-8

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  • Effects of Caragana microphylla patch and its canopy size on "islands of fertility" in a Mongolian grassland ecosystem Reviewed

    Junji Kondo, Muneto Hirobe, Yoshihiro Yamada, Jamsran Undarmaa, Keiji Sakamoto, Ken Yoshikawa

    LANDSCAPE AND ECOLOGICAL ENGINEERING   8 ( 1 )   1 - 8   2012.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11355-010-0133-0

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  • Effects of fire-derived charcoal on soil properties and seedling regeneration in a recently burned Larix gmelinii/Pinus sylvestris forest Reviewed

    Kobayashi Makoto, Muneto Hirobe, Thomas H. DeLuca, Semyon V. Bryanin, Valentina F. Procopchuk, Takayoshi Koike

    JOURNAL OF SOILS AND SEDIMENTS   11 ( 8 )   1317 - 1322   2011.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11368-011-0424-6

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  • Effects of livestock grazing on the surface soil properties in Mongolian Steppe ecosystems along an aridity gradient Reviewed

    KONDO Junji, HIROBE Muneto, UUGANTSETSEG Khorloo, AMARTUVSHIN Narantsetseg, FUJITA Noboru, SAKAMOTO Keiji, YOSHIKAWA Ken

    The Japanese Association of The Revegetaion Technology   36 ( 3 )   406 - 415   2011

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    Language：Japanese   Publisher：JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY  

    Grazing by large ungulates had both acceleration and deceleration effects on primary productivity and nutrient cycling in grassland ecosystems. The directions of these effects can differ among ecosystems because climate is one of the most important determinant. In Mongolian steppe, the ecosystem type is changed with latitudinal gradient of the aridity from forest-steppe in the north to steppe in the middle to gobi-steppe in the south. Our objective was to clarify the effects of livestock grazing on the surface soil chemical properties in three types of Mongolian steppe ecosystems along an aridity gradient. The soil samples (0.10 cm) were taken from inside and outside of the exclosure fence to analyze soil chemical properties and to determine net nitrogen (N) transformation rates for laboratory incubation. The elements essentially for the plants were decreased and net N transformations were decelerated along aridity with increasing soil pH. The effects of grazing were not prominent for the soil nutrient pools. However, the grazing decelerated net N transformation rates, especially drier incubation condition, and increased soil pH. These results suggested that grazing by large ungulates decelerated nutrient cycling, which might caused by increased alkalinity in Mongolian steppe ecosystems.

    DOI： 10.7211/jjsrt.36.406

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  • Seasonal changes of ecological characteristics on culms and leaves of Pleioblastus pubescens Nakai growing under different light conditions Reviewed

    ALA Tanhua, SAKAMOTO Keiji, MIKI Naoko, HIROBE Muneto, YOSHIKAWA Ken

    Journal of the Japanese Society of Revegetation Technology   34 ( 3 )   524 - 533   2009

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    Language：Japanese   Publisher：The Japanese Society of Revegetation Technology  

    Pleioblastus pubescens Nakai occurs in different light conditions of secondary forests in the warmtemperate zone of Japan. Under different light conditions, we experimentally grew P. pubescence by planting the rhizomes, surveyed emergence, growth and survivorship of culms and leaves, and observed the morphology of leaves. Emerging duration of culms including tillering culms was longer, and the cumulative number of those culms was larger in the high light intensity than in the low light intensity. In the high light intensity, survival number of culms tended to be higher. The culm mortality in the relative light intensity of 1% was the highest In high light intensity, culm elongation rates were slower and the length after the complation elongation tended to be shorter than in the low light intensity. Therefore, it is suggested that P. pubescens has different regimes for invading and dominating the habitats in different light conditions. It is likely that P. pubescence increases the density with short culms in the high light intensity, on the other hand, it increases the length of culms with the low density in the low light intensit In foliage, longevity of leaves in high light intensity is shorter than that in the low light intensity. It was suggested that the foliage in the high light intensity is maintained by longer duration of culm and leaf emergence, and that in low light intensity is maintained by longer leaf longevity. In addition, leaves were smaller and thicker in light conditions.

    DOI： 10.7211/jjsrt.34.524

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  • 異なる光条件で生育させたケネザサ（Pleioblastus pubescens Nakai）個葉の光合成特性 Reviewed

    阿拉担花, 坂本圭児, 三木直子, 廣部 宗, 吉川 賢

    日本緑化工学会誌   34   636 - 640   2009

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  • Environmental factors controlling leaf emergence in Caragana microphylla, a deciduous shrub of the Mongolian steppe Reviewed

    Yamada, Y, Yamaguchi, Y, ndarmaa, J, Hirobe, M, Yoshikawa, K

    Journal of Arid Land Studies   19 ( 1 )   137 - 140   2009

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  • 異なる光条件で生育させたケネザサ(Pleioblastus pubescens Nakai)個葉の光ストレスに対する生理生態的反応 Reviewed

    阿拉坦花, 石井義朗, 坂本圭児, 三木直子, 廣部 宗, 吉川 賢

    日本緑化工学会誌   35   51 - 56   2009

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  • RESPONSE OF WATER-USE PROPERTIES AND GROWTH OF SABINA VULGARIS ANT. IN DIFFERENT WATER CONDITIONS Reviewed

    YANG Lingli, MIKI Naoko, HARADA Naoki, HIROBE Muneto, SAKAMOTO Keiji, YOSHIKAWA Ken

    Journal of Environmental Science for Sustainable Society   2 ( 2 )   27 - 34   2008

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    Language：English   Publisher：Graduate School of Environmental and Life Science, Okayama University  

    &nbsp;&nbsp;We compared effects of different growing water potential conditions on physiological and morphological water&ndash;use properties of Sabina vulgaris Ant., which is an evergreen shrub that is widely distributed in arid and semi-arid environments of the Mu Us Sandy Land, China. Measurements were taken of cuttings grown for eight years under -0.02 MPa (control), -0.10 MPa (moderate water stress), and -0.34 MPa (severe water stress) water potential conditions. The transpiration rate (Tr) under moderate stress was significantly lower than that under severe stress and control water conditions (49% and 45% lower, respectively, than severe stress and the control on average). The leaf-specific hydraulic conductivity (LSC) in shrubs growing under moderate water stress was also significantly lower than for those under the severe water potential condition. In contrast, S. vulgaris growing under severe water stress had less leaf biomass than under moderate stress or control conditions. These results suggest that S. vulgaris growing under moderate water stress tends to show a reduced transpiration rate derived from its low LSC; therefore it avoids water loss in response to chronic water stress, while plants growing under severe water stress tends to reduce water loss through decreased leaf biomass. These results suggest that S. vulgaris has a high capacity for acclimation to different water potential conditions through physiological and morphological flexibility.

    DOI： 10.3107/jesss.2.27

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  • Individual-based measurement and analysis of root system development: case studies for Larix gmelinii trees growing on the permafrost region in Siberia Reviewed

    Takuya Kajimoto, Akira Osawa, Yojiro Matsuura, Anatoly P. Abaimov, Olga A. Zyryanova, Kazuma Kondo, Naoko Tokuchi, Muneto Hirobe

    JOURNAL OF FOREST RESEARCH   12 ( 2 )   103 - 112   2007.4

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    DOI： 10.1007/s10310-006-0259-y

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  • Comparison of soil N dynamics between dry dipterocarp forest and dry evergreen forest in Northeastern Thailand Reviewed

    TOKUCHI Naoko, HIROBE Muneto, NAKANISHI Asami, WACHIRINEAT Chongrak, TAKEDA Hiroshi

    Tropics   16 323-336 ( 4 )   323 - 336   2007

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    Language：English   Publisher：JAPAN SOCIETY OF TROPICAL ECOLOGY  

    We conducted a comparative study of nitrogen (N) dynamics in soil by examining a dry dipterocarp forest (DDF) and a dry evergreen forest (DEF), under similar climatic conditions, in northeastern Thailand. The soil N dynamics were described by measuring seasonal N mineralization and nitrification rates, soil microbial biomass, and the size of inorganic N pools and extractable organic N and C pools. We estimated the fluxes and production of inorganic N in soil using the ion exchange resin core and buried bag methods. Carbon and N accumulations were higher in the DEF than in DDF; DEF had likely been protected from fire for a longer time than DDF. We also found temporal and vertical differences in soil N dynamics between DDF and DEF. The greatest inorganic N flux in the soil occurred at the onset of the wet season in DDF, whereas inorganic N was produced throughout the wet season in DEF. N uptake occurred in the uppermost soil horizon in DDF, whereas N uptake in DEF occurred in the deeper soil horizon. The mean residence time of inorganic N was greater in DEF than in DDF. These results suggest that N cycles were faster in DDF than in DEF. During long-term incubation experiments, the dominant inorganic N form changed from NH4+ to NO3-, coinciding with declining extractable organic C (EOC) concentrations at both sites. Shortages of EOC occurred earlier in DDF than in DEF. This finding indicates that EOC may be a useful index of C availability for soil N dynamics.

    DOI： 10.3759/tropics.16.323

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    Other Link： https://jlc.jst.go.jp/DN/JALC/00300255155?from=CiNii

  • Spatial pattern of bamboo culms in an abandoned Phyllostachys nigra var. henonis stand(<Special Issue>THE 38TH SCIENTIFIC RESEARCH MEETING) Reviewed

    Saroinsong Fabiola Baby, Sakamoto Keiji, Hirobe Muneto, Miki Naoko, Yoshikawa Ken

    Journal of the Japanese Society of Revegetation Technology   33: 65-70 ( 1 )   65 - 70   2007

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    Language：English   Publisher：The Japanese Society of Revegetation Technology  

    Our interests are in detecting the spatial pattern of Phyllostachys nigra var. henonis culms within growth stages -sprouts, current-year culms, and 5-year-old culms- and discussing the changes among them. The analysis used Ripley's univariate L(t) function. Change in the spatial pattern among growth stages was not observed in the intermediate and edge parts of bamboo forest where culms were less aggregated from early stage. In the interior, sprouts and current-year culms had clumped distribution at almost all distances in years with high annual culm production, Spatial pattern changes were observed from a clumped distribution of current-year culms into a less aggregated distribution of 5-year-old culms. We infer that the density is a determinant in forming the spatial pattern of culm stage of P. nigra v. henonis through competition in the stand with high density culms.

    DOI： 10.7211/jjsrt.33.65

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  • Spatial and temporal patterns of water-extractable organic carbon (WEOC) of surface mineral soil in a cool temperate forest ecosystem Reviewed

    T Hishi, M Hirobe, R Tateno, H Takeda

    SOIL BIOLOGY & BIOCHEMISTRY   36 ( 11 )   1731 - 1737   2004.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.soilbio.2004.04.030

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  • Leaf-litter decomposition of 15 tree species in a lowland tropical rain forest in Sarawak: decomposition rates and initial litter chemistry Reviewed

    Muneto Hirobe, John Sabang, Balram K. Bhatta, Hiroshi Takeda

    JOURNAL OF FOREST RESEARCH   9 ( 4 )   341 - 346   2004.11

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    DOI： 10.1007/s10310-004-0087-x

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  • Leaf-litter decomposition of 15 tree species in a lowland tropical rain forest in Sarawak: dynamics of carbon, nutrients, and organic constituents Reviewed

    Muneto Hirobe, John Sabang, Balram K. Bhatta, Hiroshi Takeda

    JOURNAL OF FOREST RESEARCH   9 ( 4 )   347 - 354   2004.11

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    DOI： 10.1007/s10310-004-0088-9

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  • Fine root mass in relation to soil N supply in a cool temperate forest Reviewed

    R Fujimaki, R Tateno, M Hirobe, N Tokuchi, H Takeda

    ECOLOGICAL RESEARCH   19 ( 5 )   559 - 562   2004.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1111/j.1440-1703.2004.00669.x

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  • Natural N-15 abundance of plants and soil N in a temperate coniferous forest Reviewed

    K Koba, M Hirobe, L Koyama, A Kohzu, N Tokuchi, KJ Nadelhoffer, E Wada, H Takeda

    ECOSYSTEMS   6 ( 5 )   457 - 469   2003.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s10021-002-0132-6

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  • Fire history influences on the spatial heterogeneity of soil nitrogen transformations in three adjacent stands in a dry tropical forest in Thailand Reviewed

    M Hirobe, N Tokuchi, C Wachrinrat, H Takeda

    PLANT AND SOIL   249 ( 2 )   309 - 318   2003.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1023/A:1022804326662

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  • Dynamics of the internal soil nitrogen cycles under moder and mull forest floor types on a slope in a Cryptomeria japonica D. Don plantation Reviewed

    M Hirobe, K Koba, N Tokuchi

    ECOLOGICAL RESEARCH   18 ( 1 )   53 - 64   2003.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1046/j.1440-1703.2003.00532.x

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  • 森林生態系内における窒素循環の空間的異質性 Reviewed

    廣部 宗

    環境科学会誌   第16巻3号,227-232   2003

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  • Plant species effect on the spatial patterns of soil properties in the Mu-us desert ecosystem, Inner Mongolia, China Reviewed

    M Hirobe, N Ohte, N Karasawa, GS Zhang, LH Wang, K Yoshikawa

    PLANT AND SOIL   234 ( 2 )   195 - 205   2001.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1023/A:1017943030924

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  • Spatial and vertical differences in in-situ soil nitrogen availability along a slope in a conifer plantation forest Reviewed

    Hirobe, M, Tokuchi, N, Iwatsubo, G

    Applied Forest Science   10 ( 2 )   19 - 25   2001

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  • The potential of NO3--N utilization by a woody shrub species Lindera triloba Reviewed

    Koyama, L, Tokuchi, N, Hirobe, M, Koba, K

    The Scientific World   514 - 519   2001

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  • Topographical Differences in Soil N Transformation Using ^<15>N Dilution Method along a Slope in a Conifer Plantation Forest in Japan : Reviewed

    Tokuchi Naoko, Hirobe Muneto, Koba Keisuke

    Journal of forest research   5 ( 1 )   13 - 19   2000

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    Language：English   Publisher：Japanese Forestry Society  

    Soil N transformation was investigated using ^<15>N dilution method along a slope on a conifer plantation forest. Although there was no significant difference in the net N mineralization rates by laboratory incubation, net nitrification rates increased downslope. Gross N transformation by ^<15>N dilution method showed a distinct difference not only on the rates, but also on the main process between the lower and the upper of the slope. Half of minelarized N was immobilized and the other half was left in NH_4^+ pool at the upper part of the slope, while all of mineralized N was used for immobilization or nitrification and NH_4^+ pool decreased at the lower of the slope. Soil N transformations were classified into two groups : one was shown below 773 m and the other was shown above 782 m. The incubation with nitrification inhibitor showed that nitrification was mainly conducted by autotrophs irrespective of the position of the slope. Microbial biomass and microbial C/N were similar among the sites. However, the gross mineralization rate was higher below 773 m than above 782 m under similar respiration rates. This suggests that the substrate quality may be one of the controlling factors for soil N transformation. Extractable organic C/N was similar to microbial C/N at the lower of the slope. It indicated that the substrate was more decomposable below 773 m. It is considered that soil N transformation is affected by topographical gradient of moisture and nutrient which makes plant growth and decomposition rate different.

    DOI： 10.1007/BF02762758

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    Other Link： https://projects.repo.nii.ac.jp/?action=repository_uri&item_id=191901

  • Spatial variability of soil nitrogen transformation patterns along a forest slope in a Cryptomeria japonica D. Don plantation Reviewed

    M. Hirobe, N. Tokuchi, G. Iwatsubo

    European Journal of Soil Biology   34 ( 3 )   123 - 131   1999

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  • Gross soil N transformations in a coniferous forest in Japan Reviewed

    Tokuchi N, Hirobe M, Koba K

    Environmental forest science. Proceedings of the IUFRO Division 8 Conference, Kyoto University, Japan, 19-23 October 1998.   239 - 244   1998

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  • Topographic differences in soil N transformation patterns along a forest slope Reviewed

    M Hirobe, N Tokuchi, G Iwatsubo

    Environmental forest science. Proceedings of the IUFRO Division 8 Conference, Kyoto University, Japan, 19-23 October 1998.   54   245 - 251   1998

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Books

  • 森林生態学

    石井, 弘明, 徳地, 直子, 榎木, 勉, 名波, 哲, 廣部, 宗

    朝倉書店  2019.4  （ ISBN:9784254470543 ）

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    Total pages：vi, 173p, 図版2枚   Language：Japanese

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  • モンゴル 草原生態系ネットワークの崩壊と再生

    音田高志・廣部 宗・幸田良介（ Role： Contributor ,  第4章2 森林の動態に対する人為攪乱の影響）

    京都大学学術出版会  2013 

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  • モンゴル 草原生態系ネットワークの崩壊と再生

    近藤順治・廣部 宗（ Role： Contributor ,  第3章コラム2 家畜放牧と草原の窒素循環）

    京都大学学術出版会  2013 

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  • 森林のバランス

    廣部 宗（ Role： Contributor ,  3-27 ストイキオメトリー）

    東海大学出版会  2012 

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  • The Mongolian Ecosystem Network: Environmental Issues Under Climate and Social Changes

    Hirobe, M., Kondo, J.（ Role： Contributor ,  Part II. 9. Effects of climate and grazing on surface soil in grassland）

    Springer  2012 

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  • Pastoralism and Ecosystem Network in Mongolia

    Kondo, J., Hirobe, M., Uugantsetseg, K., Altangerel, E., Fujita, N., Sakamoto, K., Yoshikawa, K.（ Role： Contributor ,  1.4. Interactive effects of climate aridity and livestock grazing on the surface soil properties, and its spatial heterogeneity in Mongolian grassland ecosystems.）

    Research Institute for Humanity and Nature  2012 

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  • Pastoralism and Ecosystem Network in Mongolia

    Otoda, T, Koda, R, Hirobe, M, Amartuvshin, N, Baatarbileg, N, Fujita, N, Sakamoto, K, Yoshikawa, K（ Role： Contributor ,  1.13. Effects of human-caused disturbances o tree regeneration in Mongolian forests）

    Research Institute for Humanity and Nature  2012 

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  • Permafrost Ecosystems. Siberian Larch Forests

    Matsuura, Y., Hirobe, M.（ Role： Contributor ,  Chapter 8 Soil Carbon and Nitrogen, and Characteristics of Soil Active Layer in Siberian Permafrost Region）

    Springer  2010 

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  • Permafrost Ecosystems. Siberian Larch Forests

    Tokuchi, N, Hirobe, M, Kondo, K, Hobara, S, Fukushima, K, Matsuura, Y（ Role： Contributor ,  Chapter 12 Soil nitrogen dynamics in larch ecosystem）

    Springer  2010 

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  • 光合成研究法（低温科学67）

    三木直子・廣部 宗（ Role： Contributor ,  2章3.3 重量法による蒸散特性の評価）

    北海道大学低温科学研究所  2009 

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  • 基礎演習 産業生物科学

    廣部 宗（ Role： Contributor ,  一次生産、有機物の分解）

    岡山大学出版会  2009 

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  • 黒水城人文と環境研究

    吉川 賢・門田有佳子・石井義朗・三木直子・廣部 宗（ Role： Contributor ,  胡楊(Populus euphratica)の生理的、生態的特性）

    中国人民大学出版社  2007 

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  • 陸域生態系の科学 地球環境と生態系

    徳地直子・廣部 宗（ Role： Contributor ,  第３章２ 森林生態系をめぐる物質循環）

    共立出版株式会社  2006 

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  • 乾燥地の自然と緑化

    廣部 宗（ Role： Contributor ,  第１章３ 乾燥地の土壌）

    共立出版株式会社  2004 

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Presentations

  • Environmental conditions and understory vegetation in natural forests and Acacia plantations on the sand dune in the North Central Coast of Vietnam

    Tuan Quoc DOAN, Tetsuya K. MATSUMOTO, Tai Tien DINH, Naoko MIKI, Hung Thai LE, Hoang Dac Thai HO, Muneto HIROBE

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    Event date： 2025.3.15 - 2025.3.18

    Presentation type：Poster presentation  

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  • ブナ実生の生残に周囲の同種林冠木との血縁度は影響するか

    宮崎祐子, 赤路康朗, 西岡早紀, 上荷美喜, 山田和弘, 多々納琴音, 松本哲也, 廣部 宗, 坂本圭児

    日本生態学会第72回大会 

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    Event date： 2025.3.15 - 2025.3.18

    Presentation type：Poster presentation  

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  • 同種個体の存在下で形質，環境，血縁度がブナ実生の展葉に与える影響

    多々納琴音, 松本哲也, Vu Khanh Linh, 赤路康朗, 坂本圭児, 廣部 宗, 宮﨑祐子

    日本生態学会第72回大会 

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    Event date： 2025.3.15 - 2025.3.18

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  • Variations in yield and constituents of leaf essential oil of Melaleuca cajuputi growing on three coastal sand dunes in Central Vietnam

    Doan Quoc Tuan, Tetsuya Matsumoto, Dinh Tien Tai, Naoko Miki, Le Thai Hung, Ho Dac Thai Hoang, Muneto Hirobe, Nguyen Thi Hoai

    The 5th International Conference on Sustainable Agriculture and Environment  2024.12.5 

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    Event date： 2024.12.4 - 2024.12.6

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  • ベトナム中部の海岸砂丘における残存自然林とアカシア植林地の下層植生構造

    Doan Quoc Tuan, 松本哲也, Dinh Tien Tai, 三木直子, Le Thai Hung, Ho Dac, Thai Hoang, 廣部 宗

    2024年度中国四国地区生物系三学会合同大会 

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    Event date： 2024.5.11 - 2024.5.12

    Presentation type：Poster presentation  

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  • 伐採方法の異なる76年生落葉広葉樹林における伐採後2年間の萌芽枝の発生消長

    三木直子, 後藤恵, 日隈雄基, 向井美緒, 浅野 仁, 前田紹吾, 坂本圭児, 廣部 宗

    日本生態学会第71回大会 

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    Event date： 2024.3.16 - 2024.3.21

    Presentation type：Oral presentation (general)  

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  • キノコバエ送粉者の花への選好性は日本産テンナンショウ属の種同定に応用できるか？

    松本哲也, 柿嶋 聡, 小林禧樹, 前川奈々子, 多々納琴音, 大野順一, 廣部 宗, 末吉昌宏, 狩山俊悟, 宮﨑祐子

    第55回種生物学シンポジウム 

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    Event date： 2023.12.1 - 2023.12.3

    Presentation type：Poster presentation  

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  • 発芽後の環境がブナ当年生実生の定着に与える影響

    多々納琴音, 松本哲也, Vu Khanh Linh, 廣部 宗, 坂本圭児, 宮﨑祐子

    日本生態学会中国四国地区会第66回大会 

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    Event date： 2023.5.13 - 2023.5.14

    Presentation type：Oral presentation (general)  

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  • 森林斜面に沿った土壌特性の違いにシカがおよぼす影響

    廣部 宗, 清村康太, 松本哲也, 横部智浩, 兵藤不二夫, 舘野隆之輔

    第134日本森林学会大会（鳥取・オンライン） 

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    Event date： 2023.3.25 - 2023.3.27

    Presentation type：Poster presentation  

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  • 岡山県産広義マムシグサを対象とした訪花キノコバエ相に基づく隠蔽種の探索

    松本哲也, 平松勅悦, 柿嶋 聡, 宮﨑祐子, 末吉昌宏, 廣部 宗

    日本植物分類学会第22回大会（千葉） 

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    Event date： 2023.3.1 - 2023.3.5

    Presentation type：Oral presentation (general)  

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  • トチノキ個体における雄性器官と雌性器官への繁殖投資効率

    川口英之, 荒木眞岳, 飛田博順, 廣部 宗, 榎木 勉, 名波 哲, 舘野隆之輔, 金子有子, 井鷺裕司

    第133日本森林学会大会 

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    Event date： 2022.3.27 - 2022.3.29

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  • 西日本のブナ天然林における11年間のブナ実生個体群動態

    畑 俊輔, 赤路康朗, 山田和弘, 中山陽介, 石井弘明, 東 若菜, 野口結子, 牧本卓史, 坂本圭児, 廣部 宗, 松本哲也, 宮崎祐子

    日本生態学会第69回大会 

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    Event date： 2022.3.14 - 2022.3.19

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  • 76年生落葉広葉樹林における伐採後 3 年間の 実生による更新

    前田紹吾, 浅野 仁, 向井美緒, 三木直子, 廣部 宗, 坂本圭児

    第132日本森林学会大会（府中・オンライン）  2021.3 

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  • オオハンゲ (サトイモ科) の繁殖様式

    尾上元哉, 松本哲也, 廣部 宗, 宮﨑祐子

    日本生態学会第68回大会（岡山・オンライン）  2021.3 

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  • 岡山県北部に分布する広義マムシグサを対象とした隠蔽種の探索

    平松勅悦, 松本哲也, 柿嶋 聡, 宮﨑祐子, 末吉昌宏, 廣部 宗

    日本植物分類学会第20回大会 (オンライン)  2021.3 

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  • ケツユクサの可塑的な性決定メカニズム：花序内の資源動態に着目して

    佐藤弘大, 宮崎祐子, 勝原光希, 邑上夏菜, 廣部 宗, 兵藤不二夫, 丑丸 敦

    日本生態学会第68回大会（岡山・オンライン）  2021.3 

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  • 岡山県北部に分布する広義マムシグサにおける訪花昆虫相と形態に基づく隠蔽種の探索

    平松勅悦, 松本哲也, 末吉昌宏, 宮﨑祐子, 廣部 宗

    第52回種生物シンポジウム（オンライン）  2020.12 

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  • テンナンショウ属5種に訪花するキノコバエ類の種特異性と生殖隔離としての潜在的機能

    松本哲也, 廣部 宗, 末吉昌宏, 宮﨑祐子

    第52回種生物シンポジウム（オンライン）  2020.12 

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  • ケツユクサにおける花の可塑的な性決定と花序内資源量の関係

    佐藤弘大, 宮崎祐子, 勝原光希, 邑上夏菜, 廣部 宗, 兵藤不二夫, 丑丸 敦

    日本生態学会第67回大会（名古屋）  2020.3 

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  • 76年生落葉広葉樹林における伐採後2年間の萌芽枝の発生消長

    三木直子, 浅野 仁, 前田紹吾, 廣部 宗, 坂本圭児

    第131日本森林学会大会（名古屋）  2020.3 

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  • 76年生落葉広葉樹林における伐採後の実生更新

    前田紹吾, 浅野 仁, 三木直子, 廣部 宗, 坂本圭児

    第131日本森林学会大会（名古屋）  2020.3 

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  • 分布域が重複するハリママムシグサとムロウテンナンショウの受粉前生殖隔離

    松本哲也, 小林禧樹, 末吉昌宏, 宮﨑祐子, 廣部 宗

    日本生態学会第67回大会（名古屋）  2020.3 

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  • 日本の森林土壌における窒素保持能の違い

    安達亮太, 兵藤不二夫, 黒岩 恵, 大西雄二, 福島慶太郎, 木庭啓介, 廣部 宗

    日本生態学会第67回大会（名古屋）  2020.3 

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  • 中国半乾燥地における匍匐性樹木Juniperus sabina L.の被覆内外での植物群落構造の比較

    秦 龍, 山林英果, 松本哲也, 張 国盛, 廣部 宗, 三木直子

    第30回日本砂漠学会学術大会 (東京)  2019.5 

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  • 局所的環境条件がブナ若齢実生の生残と成長に 及ぼす影響

    山田和弘, 赤路康朗, 宮崎祐子, 安達亮太, 谷口武士, 兵藤不二夫, 坂本圭児, 廣部 宗

    日本生態学会第66回大会（神戸）  2019.3 

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  • 岡山県北部に分布するテンナンショウ 5 種の受粉 前生殖隔離

    松本哲也, 廣部 宗, 末吉昌宏, 宮崎祐子

    日本生態学会第66回大会（神戸）  2019.3 

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  • 雄性両全性同株ケツユクサの花の性は資源依存的 に決まるのか?

    佐藤弘大, 宮崎祐子, 勝原光希, 邑上夏菜, 廣部 宗, 兵藤不二夫, 丑丸敦史

    日本生態学会第66回大会（神戸）  2019.3 

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  • 粒径分画を用いた森林表層土壌に含まれる有機態 窒素の分解性評価

    廣部 宗, 冨田悟司, 浦川梨恵子, 兵藤不二夫, 柴田英昭

    日本生態学会第66回大会（神戸）  2019.3 

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  • 落葉広葉樹二次林における優占種コナラの成長に影響を与える環境要因

    伊藤 蒼, 兵藤不二夫, 松本哲也, 赤路康朗, 宮崎祐子, 廣部 宗, 西村尚之, 坂本圭児

    日本生態学会第66回大会（神戸）  2019.3 

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  • 分布域が重複するテンナンショウ2種における受粉前生殖隔離

    松本哲也, 宮崎祐子, 末吉昌宏, 千田善博, 廣部 宗

    第50回種生物学シンポジウム（八王子）  2018.12 

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  • ブナ林下層におけるチシマザサ群落の構造および動態

    呉崇洋, 田中 凌太, 藤好 恭平, 赤路 康朗, 廣部 宗, 坂本 圭児

    日本緑化工学会第49回大会（東京）  2018.9 

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  • ブナ若齢実生の成長に光環境と土壌環境が与える影響

    第129回日本森林学会大会  2018 

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  • 同所的に分布するテンナンショウ2種の繁殖特性

    日本生態学会第65回大会  2018 

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  • Four-year stump sprout dynamics of two deciduous oak species after cutting in an abandoned coppice forest

    第129回日本森林学会大会  2018 

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  • 冷温帯林の二次遷移に伴う地上部−地下部の生態特性とアリ群集の植生の変化

    日本生態学会第65回大会  2018 

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  • ブナ実生と共生する外生菌根菌層の解析

    中国四国地区生物系三学会合同大会（山口大会）  2018 

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  • 中国半乾燥地においてJuniperus sabinaの被覆が植物群落構造に与える影響

    第129回日本森林学会大会  2018 

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  • 中国山地のブナ天然林における主要構成樹種の24年間の動態

    第129回日本森林学会大会  2018 

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  • モンゴル国北方林における山火事と伐採が森林の更新に与える影響

    第128回日本森林学会大会  2017 

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  • ヒノキ人工林の斜面に沿った土壌の窒素無機化特性と有機態窒素存在形態

    第128回日本森林学会大会  2017 

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  • 暖温帯落葉広葉樹二次林におけるコナラ個体群の動態：30年間の観測と年輪解析結果

    第128回日本森林学会大会  2017 

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  • Effects of large-sized forest fire and illegal cutting on the regeneration of a boreal forest in Mongolia

    The 60th Symposium of the IAVS  2017 

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  • 全国各地の森林リターおよび表層土壌に含まれる水銀の分布

    第128回日本森林学会大会  2017 

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  • ブナ実生の資源分配と菌根共生に微環境が与える影響

    日本生態学会第64回大会  2017 

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  • 落葉広葉樹二次林における土壌有機態窒素の粒径分画による評価

    第127回日本森林学会大会  2016 

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  • ブナ林下層の異なる光環境下で生育するチシマザサの葉群における光順応性について

    第127回日本森林学会大会  2016 

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  • ブナ実生の生残および生長と周辺成木との血縁度の関係

    日本生態学会第63回大会  2016 

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  • 強度のシカ食害下にある冷温帯落葉広葉樹林における不嗜好性植物アシウテンナンショウの個体群構造

    日本生態学会第63回大会  2016 

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  • ブナ実生の出現および生残の時空間変動

    第127回日本森林学会大会  2016 

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  • モンゴル国北方林における火災と違法伐採がシベリアカラマツの更新に与える影響

    第127回日本森林学会大会  2016 

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  • 年輪解析による落葉広葉樹二次林の成立過程の推定

    第46回日本緑化工学会大会  2015 

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  • 中国半乾燥地の固定砂丘上におけるArtemisia ordosica Krasch.群落の構造にJuniperus sabina L.と土壌表層の環境条件が与える影響

    第46回日本緑化工学会大会  2015 

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  • 落葉広葉樹二次林における皆伐後1年間の萌芽更新と実生更新

    日本生態学会第62回大会  2015 

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  • モンゴル国北方林における違法伐採を伴う大規模火災による森林劣化

    第126回日本森林学会大会  2015 

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  • 中国の半乾燥地に生育するArtemisia ordosica Krasch.の群落構造に環境要因が与える影響

    第126回日本森林学会大会  2015 

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  • モンゴル国マンダルゴビ地域における草本種の窒素利用特性の違い

    第126回日本森林学会大会  2015 

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  • 氷ノ山におけるブナの天然更新動態：実生追跡・長期毎木・年輪・遺伝構造から

    第126回日本森林学会大会  2015 

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  • アシウテンナンショウの性表現に環境条件が与える影響

    第47回種生物学シンポジウム  2015 

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  • カントウマムシグサの性表現型決定の至近要因と個体サイズの関係

    第66回応用森林学会  2015 

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  • モンゴル半乾燥地域におけるアクナテルム属群落の水利用特性

    日本生態学会第61回大会  2014 

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  • ブナ実生の3年間の成長・生残と環境条件の関係：実生の樹齢の違いを考慮したモデルによる解析

    第125回日本森林学会大会  2014 

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  • ブナ天然林における林冠樹種の違いがブナ下層木の生残と成長に与える影響

    第125回日本森林学会大会  2014 

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  • 放棄された落葉広葉樹二次林の成立過程

    植生学会第19回大会  2014 

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  • モンゴル国の乾燥地における草本性"Key resource"群落の立地特性

    第124回森林学会大会  2013 

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  • ブナ－ホオノキ混交林におけるブナ下層木個体群の動態

    植生学会第18回大会  2013 

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  • Effects of anthropogenic forest fire on the regeneration of boreal forests in semi-arid regions of Mongolia

    56th Annual Symposium of the International Association for Vegetation Science  2013 

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  • モンゴル国の乾燥地における草本性“Key resource”群落の水分と養分の利用特性

    第124回森林学会大会  2013 

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  • Microphysical environmental controls on local variation in dwarf bamboo (Sasa palmata Nakai) distribution in a cool–temperate deciduous broad-leaved forest in Japan

    日本生態学会第60回大会  2013 

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  • 西日本のブナ原生林における年輪解析による動態の解明

    第124回森林学会大会  2013 

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  • モンゴル国の北方林における大規模火災後の更新特性

    日本緑化工学会・日本景観生態学会・応用生態工学会3大会合同大会（ELR2012東京）  2012 

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  • モンゴル国の北方林における大規模火災後の樹木の侵入と定着

    第123回日本森林学会大会  2012 

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  • 西日本のブナ天然林における19年間の林分動態

    第123回本森林学会大会  2012 

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  • Emerging and survival of culms in a bamboo Phyllosachys bambusoides stand

    Joint Meeting of The 59th Annual Meeting of ESJ and The 5th EAFES International Congress  2012 

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  • Spatial distribution of Fagus crenata seedlings and saplings in a cool temperate old-growth forest of western Japan: Effects of dwarf bamboo, topographic features, and canopy openness

    Joint Meeting of The 59th Annual Meeting of ESJ and The 5th EAFES International Congress  2012 

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  • Colonization and community structure of root-associated microorganisms of Sabina vulgaris with soil depth in a semiarid desert ecosystem with shallow groundwater

    Joint Meeting of The 59th Annual Meeting of ESJ and The 5th EAFES International Congress  2012 

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  • 氷ノ山後山那岐山国定公園のブナ天然林における19年間の林分動態

    植生学会第17回大会  2012 

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  • 乾燥程度の異なるモンゴル草原生態系において放牧が土壌窒素形態変化の空間的不均質性に与える影響

    第58回日本生態学会大会  2011 

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  • 中国毛烏素沙地における臭柏（Sabina vulgaris）群落のクローン構造

    第58回日本生態学会大会  2011 

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  • モンゴル国北部の明瞭な森林・草原境界における土壌化学性の変化

    第62回応用森林学会研究発表会・林業技術情報報告会合同大会  2011 

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  • モンゴル国forest-steppe地域における北方林の山火事後の遷移過程

    第121回日本森林学会大会  2010 

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  • モンゴル国forest-steppe地域における北方林樹種の山火事に対する更新応答と遷移過程

    日本緑化工学会第41回大会  2010 

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  • Regulation of water loss under contrasting light conditions for Quercus glauca and Eurya japonica

    東アジア生態学会連合第4回大会  2010 

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  • ヒノキ人工林における強度間伐が表層土壌に与える影響

    日本緑化工学会第41回大会  2010 

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  • 乾燥に対する樹木の水分通導性の変化〜環孔材は散孔材よりも通水に有利なのか？〜

    第57回日本生態学会大会  2010 

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  • 大山ブナ二次林における下層植生の空間分布

    第57回日本生態学会大会  2010 

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  • 極東ロシアの山火事跡地において炭が制御する実生の更新

    第57回日本生態学会大会  2010 

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  • 乾燥程度の異なるモンゴル草原生態系において放牧による被食が土壌化学性の空間的不均質性に与える影響

    第57回日本生態学会大会  2010 

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  • モンゴル国のforest-steppe地域の南限におけるBetula platyphylla林の動態にかく乱と気候変動が与える影響

    第120回日本森林学会大会  2009 

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  • モンゴルのステップにおける連続した小雨への潅木と草本の反応

    第56回日本生態学会大会  2009 

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  • 大山ブナ二次林の林分構造と樹種の空間的出現特性

    第120回日本森林学会大会  2009 

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  • 大山ブナ二次林における林床環境の空間的不均質性

    第120回日本森林学会大会  2009 

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  • コナラとシラカンバにおける木部道管の通水特性キャビテーションの発生と解消

    第120回日本森林学会大会  2009 

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  • 林冠タイプの違いが林床に生育するケネザサの生産特性に与える影響

    第55回日本生態学会大会  2008 

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  • 乾燥程度の異なるモンゴル草原生態系において放牧の有無が表層土壌の特性に与える影響

    第55回日本生態学会大会  2008 

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  • コナラとシラカンバにおける水分通導度の日変化：遠心法から評価した潜在的な通水能との比較

    第119回日本森林学会大会  2008 

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  • 中国半乾燥地に生育する2種類のヨモギの水ストレス耐性の比較〜通水コンダクタンスと樹体内の水ポテンシャル勾配〜

    第55回日本生態学会大会  2008 

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  • モンゴルの草原ステップにおいてCaragana microphyllaが形成するマウンドの土壌特性

    日本沙漠学会第19回学術大会  2008 

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  • 森林火災による残存有機物の空間分布−有機物分解や植生遷移との関わり−

    第119回日本森林学会大会  2008 

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  • Cuurent shoot morphology of Larix gmelinii at the first order branch level: Chronological pattern and nitrogen fertilization effects. 1. Light environment.

    Meeting on Larix Project  2007 

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  • アカマツ二次林における下層木の除去が林冠木の生産性と水利用特性に与える影響

    第118回日本森林学会大会  2007 

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  • Development of stand structure in larch forests that grow on permafrost

    第54回日本生態学会大会  2007 

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  • Growth and water relations of Artemisia sphaerocephala grown in different water regimes

    第58回森林学会関西支部等合同大会  2007 

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  • 森林土壌における窒素動態の不均質性

    東京農工大学大学院共生科学技術研究院環境資源共生科学部門伊豆田研究室セミナー  2007 

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  • Age sequence of stand structure, carbon accumulation and allocation, and net primary production in permafrost larch (Larix gmelinii) ecosystems in Siberia: current knowledge and future study

    7th International Conference on Global Change: Connection to the Arctic (GCCA-7)  2007 

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  • Effects of unburned moss island on local soil properties in a burned black spruce forest in interior Alaska

    7th International Conference on Global Change: Connection to the Arctic (GCCA-7)  2007 

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  • Nitrogen cycling in larch forests on permafrost in central Siberia

    7th International Conference on Global Change: Connection to the Arctic (GCCA-7)  2007 

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  • Plant responses to biogeochemical shifts in nitrogen dynamics following wild fire

    7th International Conference on Global Change: Connection to the Arctic (GCCA-7)  2007 

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  • Fire effects on DOC and metal concentrations in an Alaskan boreal forest

    7th International Conference on Global Change: Connection to the Arctic (GCCA-7)  2007 

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  • 冷温帯落葉広葉樹林の斜面に沿った土壌窒素無機化特性の時空間的変動

    日本生態学会第53回大会  2006 

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  • 樹木内部における通導性と季節変化

    日本生態学会第53回大会  2006 

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  • 森林における土壌の空間的不均質性

    日本科学者会議岡山大学農学部班講演会  2006 

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  • N施肥が永久凍土帯カラマツ林生態系内N循環に及ぼす影響

    日本生態学会第53回大会  2006 

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  • Impacts of nitrogen fertilization on soil nitrogen dynamics in a larix forest in Tura, Central Siberia

    6th International Conference on Global Change: Connection to the Arctic (GCCA6)  2005 

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  • Variations in soil properties along a riverside toposequence in Central Siberia

    Meeting on Larix project  2005 

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  • 森林における土壌の空間的不均質性

    京都大学大学院農学研究科森林科学専攻森林育成学分野セミナー  2005 

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  • The effects of soil N dynamics on the distribution of understory vegetation in a Cryptomeria japonica plantation

    AcidRain2005 (7th International Conference on Acid Deposition)  2005 

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  • Responses of leaf N concentration to fertilization by larix and alder in Tura, Central Siberia

    6th International Conference on Global Change: Connection to the Arctic (GCCA6)  2005 

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  • Variations in soil properties along a riverside toposequence in Central Siberia

    6th International Conference on Global Change: Connection to the Arctic (GCCA6)  2005 

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  • Stand structure and carbon allocation of Larix gmelinii forest ecosystem on continuous permafrost region in Siberia: analysis using indices of above- and below-grond inter-tree competition

    6th International Conference on Global Change: Connection to the Arctic (GCCA6)  2005 

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  • Long-term development of larch forest ecosystems on continuous permafrost of Siberia: structural constraints and implications to carbon accumulation

    5th International Workshop on Global Change: Connection to the Arctic  2004 

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  • 水のみ場の移動が林内放牧牛の行動圏に及ぼす影響

    日本畜産学会，第103回大会  2004 

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  • Changes in the spatial heterogeneity of soil nitrogen transformations after long-term repeated fires in a dry tropical forest in Thailand

    森林総合研究所立地環境研究領域セミナー：Nitrogen- its dynamics in forest ecosystems and research frontier  2004 

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  • Does nitrogen limit for plant growth in larch forest in Tura, central Siberia

    5th International Workshop on Global Change: Connection to the Arctic  2004 

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  • N cycling at Larix stand in Tura, central Siberia

    5th International Workshop on Global Change: Connection to the Arctic  2004 

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  • 溶存炭素中炭水化物濃度の時空間的な変化

    日本林学会，第114回大会  2003 

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  • 熱帯季節林における土壌化学性の空間的異質性ー繰り返し火災からの経過年数に伴う変化ー

    日本生態学会，第50回大会  2003 

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  • N cycling at Larix stand at Tura - preliminary results-

    4th International Workshop on Global Change: Connection to the Arctic  2003 

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  • Decomposition of high quality leaf litters in cool temperate forest

    The VIII INTECOL  2002 

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  • 熱帯季節林における土壌の窒素無機化特性の空間的異質性－森林火災履歴による違い－

    日本林学会，第113回大会  2002 

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  • 半乾燥地において植物が創り出す土壌の空間的異質性と植物の生理・生態的特性

    日本生態学会，第49回大会自由集会  2002 

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  • 森林生態系内における窒素循環機構の空間的異質性

    環境科学会，2002年会  2002 

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  • トチノキ繁殖個体における3年間の純生産の配分

    日本生態学会，第48回大会  2001 

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  • 中国毛烏素沙地における土壌特性の空間変動パターンと植生

    日本生態学会，第48回大会  2001 

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  • Fine root biomass in relation to soil N supply in a cool temperate forest: a comparison between mull and moder forest floor types

    The 6th symposium of the International Society of Root Research  2001 

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  • Soil NO3ﾐ for plants: saturated or not? －Estimation of soil NO3ﾐ availability and plant ability of NO3ﾐ uptake in Japanese forest－

    N2001 The Second International Nitrogen Conference  2001 

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  • トチノキ個体群の開花フェノロジー

    日本生態学会第47回大会  2000 

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Research Projects

  • ベトナム中部の海岸珪砂砂丘における残存在来種林と外来種植林地の生態学的特性の解明

    Grant number：22K05748  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    廣部 宗, 三木 直子, 松本 哲也

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    Grant amount：\4160000 （ Direct expense: \3200000 、 Indirect expense：\960000 ）

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  • Role of soil microbial function and diversity on determining soil fertility along a topographic gradient

    Grant number：21H02235  2021.04 - 2025.03

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

    舘野 隆之輔, 徳地 直子, 廣部 宗, 兵藤 不二夫, 磯部 一夫

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    Grant amount：\17160000 （ Direct expense: \13200000 、 Indirect expense：\3960000 ）

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  • Regional variation in nitrogen retention potential of surface soil in Japanese forests

    Grant number：18K05747  2018.04 - 2022.03

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

    Hirobe Muneto

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    Grant amount：\3120000 （ Direct expense: \2400000 、 Indirect expense：\720000 ）

    To investigate nitrogen retention potential of surface soil in Japanese forests, soil samples were collected from forests across Japan with different climatic conditions, vegetation, and parent materials, and analyzed for net nitrogen mineralization, the quantity and quality of organic nitrogen with different degradability, and the percentage of incorporation of the tracer inorganic nitrogen in soil organic matter. The results indicated that most of the tracer inorganic nitrogen was not incorporated into soil organic matter that showed relatively low carbon/nitrogen ratio of organic matter bound to fine mineral particles, suggesting that forests with such soils may be more sensitive to external nitrogen loading.

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  • Acclimating mechanisms of dwarf bamboos dominating understory layers in a beech forest

    Grant number：15K07828  2015.04 - 2018.03

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

    Sakamoto Keiji

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

    We have demonstrated the acclimating mechanisms of dwarf bamboo, Sasa kurilensis, to the different light conditions in the understory of a beech forest. Density and biomass of S. kurilensis were significantly largest under the gap, and smallest under the canopy trees of Fagus crenata. Maximum photosynthetic rate per a culm was estimated from the photosynthetic rate per a unit leaf area, leaf areas, and leaf numbers of a culm. The values were lowest under the canopy trees of F. crenata, and significant differences were not detected between the values under the gap and the canopy trees of Magnolia obovata. S. kurlensis dominates the understory in a beech forest by the acclimatization in the different light conditions caused by different canopy types.

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  • Relationships between nitrogen in mineral associated organic matter and nitrogen retention of forest soils

    Grant number：26450196  2014.04 - 2018.03

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

    Hirobe Muneto, Hyodo Fujio

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    Grant amount：\5070000 （ Direct expense: \3900000 、 Indirect expense：\1170000 ）

    We tried to understand nitrogen (N) retention of forest soils, focusing on N in mineral associated organic matter (MAOM). In the experiment, we also tried to consider the topographic variations in soil N transformations. In the examined two forest stands, the results of N-15 addition incubation suggested that N over fine mineral particles (silt and clay) did not related to N retention, and that lower C/N ratio of MAOM indicated lower N retention. Further research in many forest types is needed for generalization.

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  • N saturation mechanism along the forest aging and influence simulation by PnET-CN

    Grant number：19380086  2007 - 2010

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

    TOKUCHI Naoko, OHTE Nobuhito, KOYAMA Lina, HISHI Takuo, KANEKO Yuko, HIROBE Muneto, HOBARA Satoru, TATENO Ryunsuke, FUKUSHIMA Keitaro

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    Grant amount：\19240000 （ Direct expense: \14800000 、 Indirect expense：\4440000 ）

    We Studied N dynamics using ^<15>N dilution method. Immobilization rates were always larger than mineralization and nitrification rates throughout the year and stand age. The relationship between N transformation rates and soil properties ; dissolved organic carbon concentration and soil microbial biomass etc., differed among the seasons. Based on the ^<18>O of NO_3^- of soil solution and the simulation of N immobilization, immobilization of NO_3^- in soil solution needed a few weeks. These results show that abiotic immobilization is one of the important mechanisms for soil N retention in the forest ecosystem.

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  • Studies on revegetation techniques and its evaluation for DSS prevention

    Grant number：17405001  2005 - 2008

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

    YOSHIKAWA Ken, MAKI Taichi, YAMAMOTO Fukujyu, YAMANAKA Norikazu, OHTE Nobuhito, HIROBE Muneto, MIKI Naoko, WANG Ringhe, UNDARMAA Jamsran

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    Grant amount：\6830000 （ Direct expense: \6200000 、 Indirect expense：\630000 ）

    黄砂発生防止のために、環境に配慮した緑化技術の開発を目指して、植栽試験と灌木ステップの生態的特性および乾燥地に生育する植物の生理特性の解明を行った。その結果、無灌漑でも植林できる方法として、冬季植栽の可能性が明らかとなった。また、灌木ステップにおける灌木の防砂効果と灌木マウンドの栄養的特性を定量的に評価できた。さらに、典型的な乾燥地植物である臭柏の耐光性、耐寒性のメカニズムを解明した。

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  • 皆伐一斉造林施業にともなう土壌窒素動態の時空間的変動

    Grant number：17780126  2005 - 2006

    日本学術振興会  科学研究費助成事業  若手研究(B)

    廣部 宗

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    Grant amount：\2000000 （ Direct expense: \2000000 ）

    森林施業を考慮した窒素循環機構の時空間的な変動を把握するための基礎的知見として,本研究では約80年輪伐により管理されているスギ人工林を対象に,林齢と地形(斜面上の位置)が土壌の窒素動態に及ぼす影響を明らかにすることを目的とした.
    京都大学フィールド科学教育研究センター和歌山研究林近郊のスギ人工林を調査地とし,調査地内の植裁後6年,16年,31年,42年,および90年の5林分を調査対象とした.調査対象林分の右岸斜面において,斜面に沿った尾根部から谷部まで等間隔に5つの土壌採取位置を設定し,それぞれの土壌採取位置で等高線方向に2m間隔で決定した5つの土壌採取地点から2005年7月に土壌を採取した.採取した土壌試料数は各林分で25サンプル,合計125サンプルである.本年度も採取した土壌の分析を継続し,これまでに実験室培養による窒素形態変化特性,全炭素・全窒素濃度,pH,および有効態リン酸濃度を分析・測定した。その結果,窒素の形態変化特性には林齢による変動も地形による変動もみられたが、その他の土壌特性値は主に地形による変動を示した.また,調査地に埋設したイオン交換樹脂を回収し,吸着された無機態窒素を分析した結果,斜面の下部では土壌中の無機態移動量が林齢によって大きな差がなかったが,斜面の上部では30年生以降の林分でやや多い傾向があった.窒素安定同位体を用いた総窒素形態変化特性と土壌中の溶存有機物については現在も分析を継続しており,今後これらの結果を総合して皆伐一斉造林施業にともなう土壌窒素動態の時空間的変動とその決定要因についてさらに考察を深める.

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  • Development of bio-resource recycling agricultural system, and water cleanin system with effective use of digestive fluids from biogas-plant.

    Grant number：16380223  2004 - 2007

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

    SUGIMOTO Yasuhiro, KUNITAKE Hisato, SIOMORI Kouichiro, KIRIMURA Masaaki, MORIYA Kazuyuki

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    Grant amount：\16530000 （ Direct expense: \15900000 、 Indirect expense：\630000 ）

    The effect of massive application of digestive-juice (1000 kg N/ha: DJ) getting from biogas-plant on the dry matter and N yield, NOs-N content of plant etc was compared with chemical fertilizer (CF) for Knot grass (Paspalum distichum L.) cultivated in the paddy field. The significant difference was not found between treatments in dry matter and N yield, and NO_3-N level of plant was low in each treatment. Nitrate-N contents of ground-water was lower in DJ (0.50 mg1-1) than thatofCF (0.86 mg1-1). CH_4 and N_2O emissions were low in both treatments. From above result, DJ is equivalent to CF as the fertilizer, and it is thought that Knot grass cultivation in paddy field with massive input of DJ is possible method for high yield and good quality forage production system without environmental pollutions.
    The effects of DJ on sugars (mainly glucose and fructose) and organic acids of blueberries were examined. There are to observe any effect of the DJ on sugar composition. However, the total sugar contents was higher in the DJ plot than that of CF plot. Most of the organic acids in the fruit were citrates, and the DJ did not appear to influence their component percentages. However, total organic acid content was lower in DJ.
    DJ was solidified by transforming it into gel capsules with alginic acid and then drying these capsules 1).Alginic acid and activated charcoal were added to the DJ. The mixture was dripped into a calcium chloride solution, which was then filtered to obtain the capsules. The addition of activated charcoal was effective in preventing the humic substances from dissolving into the effluent after preparation, as it absorbed the humic substances from the digestive fluid. We also believe it to have been effective in solidifying the nitrogen con-tent and in delaying the release of DJ components. Immediately after preparation and before drying, the diameter of a single grain was 4. 1 mm, in comparison with 2. 8 mm after drying. One dried capsule contained 15,000 ppm of total nitrogen, so we were able to prepare an effective fertilizer by solidifying the nitrogen con-tent of the digestive fluid.

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  • Carbon and nitrogen accumulation mehcamnisms in forested ecosystem and its estimation

    Grant number：15380105  2003 - 2006

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

    TOKUCHI Naoko, OHTE Nobuhito, HIROBE Muneto, TATENO Ryunosuke

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    Grant amount：\16000000 （ Direct expense: \16000000 ）

    In this study, we used stable and radioactive C isotopes with soil fractionation methods in a C_3 coniferous plantation converted from C_4 grassland, in Japan. The difference in δ^<13>C values between the surface litter and the soil organic carbon (SOC) below the litter was 5‰ or greater; this large isotopic difference was attributed to rapid decomposition in the litter layer and preservation of C derived from the previous C_4 vegetation. Most SOC Δ^<14>C values were negative throughout the soil profile, suggesting that most of the SOC in the soil profile was recalcitrant and had been preserved for a long time. Only the surface sand values were slightly positive. These results suggest that most newly input C is consumed at the soil surface. The low ability of these soils to preserve newly input C is one factor in the slow recovery of soil C. From the results of soil organic matter with vegetation re-growth, there was no significant change in soil C, although the surface soil organic matter changed with forest management. It reached the plateau after 40 years of re-growth. The value was almost similar to the accumulated organic matter in the climax forest. It is considered that carbon and nitrogen accumulation in the forested ecosystem reaches the potential amount after 40 years of forest re-growth.

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  • 森林生態系における窒素循環機構の空間的異質性に関する研究

    Grant number：97J02714  1998

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    廣部 宗

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

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