| Budget Amount *help |
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2023: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2021: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
Diverse types of tropical rainforests occur in Borneo, which has weathered soils derived from old geological substates. We investigated if the occurrence of such diverse forests could be explained by the asymmetrical relationship of N versus P cycles. We studied canopy tree communities, dithionite-extractable Fe, and soil N and P concentrations in study plots placed in Borneo. There was a wide gradient of Fe oxide concentration among the study plots, and soil nutrient availability shifted from relative P deficiency to relative N deficiency with increasing magnitude of Fe leaching. Tree community composition shifted continuously along this soil gradient. This result suggested that dominant trees were successively displaced with each other from P-deficiency adapted to N-deficiency adapted species. Diverse forests are formed along a soil nutrient gradient with N versus P deficiencies as two endmembers through plant-soil feedbacks.
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