| Project/Area Number |
10041221
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| Research Category |
Grant-in-Aid for International Scientific Research.
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Field |
生態
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| Research Institution | KYOTO UNIVESITY |
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Principal Investigator |
YAMAMURA Norio Center for Ecological Research, Kyoto University, Professor, 生態学研究センター, 教授 (70124815)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Masamichi Kiso Branch of Forestry and Forest Products Research Institute, Research Ecologi, 木曾分場, 主任研究官
TAKYU Masaaki Forestry Products Research Institute, Ecologist, 研究官
KITAYAMA Kanehiro Forestry Products Research Institute, Research Ecologist, 主任研究官
WADA Eitaro Center for Ecological Research, Kyoto University, Professor, 生態学研究センター, 教授 (40013578)
KIKUZAWA Kihachiro Center for Ecological Research, Kyoto University, Professor, 生態学研究センター, 教授 (50271599)
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| Project Period (FY) |
1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Keywords | altitude / ecosystem function / soil animals / leaf fall / mycorrhizar / frass fall |
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| Research Abstract |
Functions of forest ecosystems on different altitudes and geology were surveyed. From the litter fall study, annual leaf litter amounted to 500-1000 g m-2 yr-i. While from frass litter study, annual amount of feces which was supposed to be defecated from herbivorous insects was 1-8 g m-2 y-l. From these, annual leaf consumption by herbivorous insects was estimated to be less than 5% of total leaf production. Thus in these forest ecosystems, large part of annual production was assumed to go directly to the detritus food chain in forest soils. The rate of mineralization of organic nitrogen to amonium ion was highest in March when some moderate drought occurrs. This timing corresponds to the timing of leaf flush of many tree species. Forest soil animal investigation suggests that forest soils in low altitudes were dominated by meso-fauna. While in high altitudes, especially in serpentine soils, earthworm biomass increased. From the soil mycorhiza study, mycoryzha density is suggested to be highest in the forsts of mid altitude. Hence in the decomposition process of organic matter in forest soils, mesofauna may be important in low altitude, fungi is important in mid altitude and earthworm is important in high altitude.
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