| Project/Area Number |
26520312
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 特設分野 |
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| Research Field |
Food Cycle Research
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| Research Institution | Forestry and Forest Products Research Institute |
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Principal Investigator |
Fujii Kazumichi 国立研究開発法人森林総合研究所, 立地環境研究領域, 主任研究員 (60594265)
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| Co-Investigator(Kenkyū-buntansha) |
早川 智恵 東京大学, 大学院農学生命科学研究科(農学部), 特別研究員 (10725526)
磯部 一夫 東京大学, 大学院農学生命科学研究科(農学部), 助教 (30621833)
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| Project Period (FY) |
2014-07-18 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | アミノ酸 / 窒素無機化 / 土壌有機物 / 渓流水 / 土壌肥沃度 / 地質学的施肥 / 懸濁態物質 / 溶存有機態窒素 / 水田土壌 / 棚田 / 有機態窒素 |
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| Outline of Final Research Achievements |
In a forest-paddy system, streamwater can provide basic cations, whilst N supply was assumed to be small. However, streamwater N includes suspended and dissolved forms of N. Thus, we quantified N flux in forest-paddy system and estimated N mineralization potentials in paddy soils. The results showed that amino acid N flux via streamwater was small, but its rapid turnover could provide inorganic N to rice in paddy soil. We caould also show quantitatively that N migration through suspended matters and their mineralization can not be neglected as "mnatural fertilizer" on paddy soils.
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