| 研究課題/領域番号 |
21KK0114
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| 研究種目 |
国際共同研究加速基金(国際共同研究強化(B))
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| 配分区分 | 基金 |
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| 審査区分 |
中区分40:森林圏科学、水圏応用科学およびその関連分野
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| 研究機関 | 京都大学 |
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研究代表者 |
EPRON Daniel 京都大学, 農学研究科, 教授 (60844305)
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| 研究分担者 |
東 若菜 神戸大学, 農学研究科, 助教 (20780761)
村瀬 潤 名古屋大学, 生命農学研究科, 教授 (30285241)
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| 研究期間 (年度) |
2021-10-07 – 2024-03-31
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| 研究課題ステータス |
完了 (2023年度)
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| 配分額 *注記 |
17,810千円 (直接経費: 13,700千円、間接経費: 4,110千円)
2023年度: 3,250千円 (直接経費: 2,500千円、間接経費: 750千円)
2022年度: 4,550千円 (直接経費: 3,500千円、間接経費: 1,050千円)
2021年度: 10,010千円 (直接経費: 7,700千円、間接経費: 2,310千円)
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| キーワード | Soil methane / Rubber plantation / Southeast Asia / Fertilisation / Nitrogen cycling / Microbial ecology / Soil nitrogen cycling / Soil microbial ecology / Soil methane uptake / Soil nitrogen / Hevea plantation / Tree water use |
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| 研究開始時の研究の概要 |
The project aims at characterising the effect of fertilisation on atmospheric methane by the soil, by testing two hypotheses: (1) fertilisation increases tree water use, reducing soil water content thus increasing the diffusion and the consumption of atmospheric; and (2) fertilization increases inorganic nitrogen and available phosphorus in the soil. Mineral nitrogen is known to inhibit methanotrophic activity when concentrations become high, while phosphorus may amplify or alleviate nitrogen inhibition.
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| 研究実績の概要 |
While the proposal has been adopted in November 2021, the research started in September 2022 due to the Covid 19 and border restrictions. However, the project was successfully completed.
Two additional team trips were organized this year, one in August 2023 (4 researchers + 3 students) and one in February 2024 ( 4 persons + 1 students) for intensive measurements and samplings (CH4 fluxes from soils and tree stems, soil CH4 concentration, microbiology, nitrogen cycling, soil nutrient capture).
The 18-month series of CH4 flux measurements showed a very clear effect of fertilization on the soil CH4 fluxes, not only reducing aerobic oxidation of methane as we hypothesized but also increasing methane production in the soil. We found that fertilization has turned a rubber plantation from sink to CH4 source. The reduction in soil methane oxidation was not related to difference in gas diffusivity. Higher nitrogen concentrations in the fertilized treatments inhibited methanotrophy and enhanced methanogenesis while concomitantly higher concentrations of dissolved organic carbon provided substrates for methanogenesis. Tree stems emitted methane but had a negligible contribution to the CH4 budget of a rubber plantation
Our Thai partners have successfully applied for a large “Reinventing KU” program which includes our JSPS project and through which two of us have been invited twice as Visiting Professors during the last fiscal year which allowed us to experiment in other provinces of Thailand, paving the road for a new research proposal.
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