| Project/Area Number |
17580125
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学・森林工学
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
TODA Hiroto Tokyo University of Agriculture and Technology, Institute of Symbiotic Science and Technology, Associate Professor (00237091)
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| Co-Investigator(Kenkyū-buntansha) |
HAIBARA Kikuo National University Corporation Tokyo University of Agriculture and Technology, Institute of Symbiotic Science and Technology, National University Corporation, Graduate School, Professor (00014960)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,780,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Available P / Mineralizable organic P / Microbial biomass P / Tropical soil / Karst soil / Hedley method / P supply / Stricken area of volcanic eruption / 可吸態リン / リン供給速度 / Hedely法 / 年間P吸収量 / 火山被害地 / N / P比 / 熱帯林土壌 / Bray II法 / 可給体リン / 微生物体リン / 無機態リン / 有機態リン / リン画分 / イオン型リン / 陰イオン交換メンブランフィルター |
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| Research Abstract |
Phosphorus fractions by Hedley method and microbial biomass P (MBP) have been investigated in general Japanese forest, tropical forest and karst region forest soils to clarify the characteristics of P and P supply to forest vegetation. The results are summarized as follows.
1. Available-P (Ion fraction-P + Bicarb-P) concentrations were remarkable low (under 30 μg P/g), and their values were lower than the annual uptake P by forest vegetation.
2. Mineralizable-P is much in general Japanese forest. Phosphorus mineralization rate from organic P is important for P supply to forest vegetation.
3. In tropical forest soil with strong weathering in East Kalimantan in Indonesia, total-P amount, available-P ratio and mineralizable-P ratio decreased with decreases of forest vegetation.
4. MBP concentrations were greater than labile-P (available plus mineralizable-P) concentrations, so MBP pool is important for P supply to tropical forest.
5. In forest soils in a karst region of the upper Yangtze River in China, both available-P and mineralizable-P have strong positive correlation with soil pH and total-C.
6. Available-P concentrations by Hedley method have positive correlation with P concentrations by Bray II and Olsen methods. Available-P by Hedley is nearly equal to Bray II-P.
7. MBP concentrations were nearly equal as labile-P concentrations, so MBP is index of P supply evaluation in karst region forest.
8. In the region of the thick and very hard volcanic ash sedimentation in Miyake Island, Alnus sieboldiana grew a lot with their root nodule because of poor N supply in the ash layer.
9. The tropical natural forest and Kanto region forest in Japan, which have rich N supply, had P limit condition compared to N condition.
10. We discuss that P supply to root noble is the key to forest recovery in tropical degradation forest and in acid soil on Miyake Island.
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