| Project/Area Number |
26850035
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Chiba University |
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Principal Investigator |
Yashima Miwa 千葉大学, 大学院園芸学研究科, 講師 (60527927)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 窒素無機化 / 水田土壌 / 地球温暖化 / 高濃度二酸化炭素環境 / 土壌炭素 / 土壌窒素 / 炭素無機化 / 高濃度二酸化炭素 / 肥沃度 / 水田 / モデル / FACE / メタン / 大気二酸化炭素濃度 / 開放系圃場 / 地力窒素 / イオン交換樹脂 / 予測モデル |
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| Outline of Final Research Achievements |
We tested the effects of in situ soil temperature elevation, elevated air CO2 concentration, and no N fertilization for 6 years on paddy soil fertility. The results showed that there was no statistically significant fertility decrease. On the other hand, easily decomposed soil C decreased only in CO2 elevated treatment after a few years of treatment. This result may indicate that elevated air CO2 concentration decreases soil C stock in a long term. The management practice of organic matter such as rice straw has much more impact than CO2 concentration and N fertilization do.
Global warming leads soil temperature raise. And soil N mineralization increases. Our study showed that 1st order kinetics and effective temperature theory can estimate the amount of soil N mineralization and N supply for plants under a global warming environment as well.
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