2007 Fiscal Year Final Research Report Summary
Studies on Soil Organic Matter Dynamics and Their Application for Sustainable Agriculture in Humid Tropics
| Project/Area Number |
17208028
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Boundary agriculture
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| Research Institution | Kyoto University |
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Principal Investigator |
KOSAKI Takashi Kyoto University, Graduate School of Global Environmental Studies, Professor (00144345)
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| Co-Investigator(Kenkyū-buntansha) |
NAWATA Eiji Kyoto University, Graduate School of Agriculture, Professor (30144348)
TANAKA Ueru Kyoto University, Graduate School of Global Environmental Studies, Associate Professor (10231408)
FUNAKAWA Shinya Kyoto University, Graduate School of Agriculture, Associate Professor (20244577)
YANAI Junta Kyoto Prefectural University, Graduate School of Agriculture, Associate Professor (00273491)
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| Project Period (FY) |
2005 – 2007
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| Keywords | amorphic properties of sesquioxides / climatic conditions / dissolved organic carbon / giostatistics / humid tropics / parameters / soil acidity / soil organic matter |
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| Research Abstract |
The main results obtained in the present study, in which soil organic matter (SOM) dynamics in humid tropics were investigated, are listed below:
1) In situ SOM dynamics were measured together with detailed monitoring on environmental conditions such as soil temperature and moisture, and parameters that primarily control the SOM dynamics in various regions of humid tropics were determined. The regions included: Japanese natural forests, Indonesia natural forest with different soil parent materials, shifting cropland fields and fallow forests used by Karen people in northern Thailand, sandy cropland in Northeast Thailand, and different home gardens in Indonesia.
2) To optimize regional crop rotation systems for mitigating SOC depletion, spatial and temporal variation of the SOM dynamics was analyzed using a giostatistics technique in sandy croplands in Northeast Thailand. A clear spatial variation was observed for organic C and N soil content, particle size distribution, and other related
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properties. The SOM dynamics and soil erosion were postulated to be driving forces behind the observed heterogeneity in soil properties. The results also indicated that the methodology of geostatistics were useful to simulate SOM dynamics in a regional scale considering spatial heterogeneity of soil resources according to topography.
3) Soil-related parameters controlling SOM dynamics were determined in different regions of humid tropics. The C and N dynamics in the shifting cropping fields in East Kalimantan were influenced by the degree of soil acidity. The volcanic-derived properties of soils (or amorphic properties of sesquioxides) also strongly controlled SOM dynamics in different soils investigated.
4) Thus the decomposition rates of SOM varied widely even in the limited areas of humid Asia, depending not only on climatic conditions but also on soil properties relating to particle size and/or amorphous characteristics, the latter of which reflects both the climatic (i. e., cool) and geological (i. e., volcanic origin) conditions. Soil acidity can affect C fluxes in different ways; that is, through changing decomposition rate constant and splitting ratio for decomposition to assimilation, or forming DOC that migrates to downward in soil profiles. Some of these conditions are specific for humid tropics. Therefore, these conditions should be taken into account to establish SOM dynamics model that could actually be applied to ecosystems in humid tropics. Less
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Research Products
(66 results)
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[Journal Article] Evaluation of nutrient availability of sandy soil in Northeast Thailand with reference to growth, yield and nutrient uptake by maize2007
Author(s)
Yanai, J., Nakata, S., Funakawa, S., Nawata, E., Katawatin, R., Tulaphitak, T., Kosaki, T.
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Journal Title
Japanese Journal of Tropical Agriculture 51
Pages: 169-176
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Evaluation of nutrient availability of sandy soil in Northeast Thailand with reference to growth, yield and nutrient uptake by maize.2007
Author(s)
Yanai, J., Nakata, S., Funakawa, S., Nawata, E.,. Katawatin, R., Tulaphitak, T., Kosaki, T.
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Journal Title
Japanese Journal of Tropical Agriculture 51(4)
Pages: 169-176
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Carbon dioxide emission derived from soil organic matter decomposition and root respiration in Japanese forests under different ecological conditions2006
Author(s)
Shinjo, H., Kato, A., Fujii, K., Mori, K., Funakawa, S., Kosaki, T.
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Journal Title
Soil Science and Plant Nutrition 52
Pages: 233-242
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Temperature and moisture dependence of organic matter decomposition in soils from different environments, with special reference to the contribution of light- and heavy-fraction C2006
Author(s)
Funakawa, S., Nishiyama, Y., Kato, A., Kadono, A., Kosaki, T.
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Journal Title
Pedologist 50
Pages: 29-45
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Soil organic matter dynamics in a sloped sandy cropland of Northeast Thailand with special reference to the spatial distribution of soil properties2006
Author(s)
Funakawa, S., Yanai, J., Hayashi, Y., Hayashi, T., Watanabe, T., Noichana, C., Panitkasate, T., Katawatin, R., Kosaki, T., Nawata, E.
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Journal Title
Japanese Journal of Tropical Agriculture 50
Pages: 199-207
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Carbon dioxide emission derived from soil organic matter decomposition and root respiration in Japanese forests under different ecological conditions.2006
Author(s)
Shinjo, H., Kato, A., Fujii, K., Mori, K., Funakawa, S., Kosaki, T.
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Journal Title
Soil Science and Plant Nutrition 52(2)
Pages: 233-242
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Temperature and moisture dependence of organic matter decomposition in soils from different environments, with special reference to the contribution of light- and heavy-fraction C.2006
Author(s)
Funakawa, S., Nishiyama, Y., Kato, A., Kadono, A., Kosaki, T.
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Journal Title
Pedologist 50(1)
Pages: 29-45
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Soil organic matter dynamics in a sloped sandy cropland of Northeast Thailand with special reference to the spatial distribution of soil properties.2006
Author(s)
Funakawa, S., Yanai, J., Hayashi, Y., Hayashi, T., Watanabe, T., Noichana, C, Panitkasate, T., Katawatin, R., Kosaki, T., Nawata, E.
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Journal Title
Japanese Journal of Tropical Agriculture 50(4)
Pages: 199-207
Description
「研究成果報告書概要(欧文)」より
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[Presentation] タンザニア広域土壌調査報告2008
Author(s)
舟川晋也, 吉田啓史, 渡邊哲弘, Method Kilasara, 小崎隆
Organizer
日本熱帯農業学会第104回講演会
Place of Presentation
鹿児島大学
Year and Date
2008-10-19
Description
「研究成果報告書概要(和文)」より
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[Presentation] Clay mineralogy and its relation to water extract composition for soils from different environment in humid Asia : Japan, Thailand, and Indonesia. In 18th World Congress of Soil Science Abstracts, July 9-15, Philadelphia, PA, p.305.2006
Author(s)
Watanabe, T., Funakawa, S., Kosaki, T.
Organizer
18th World Congress of Soil Science
Place of Presentation
Philadelphia, PA
Year and Date
20060709-20060715
Description
「研究成果報告書概要(欧文)」より
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