| Project/Area Number |
21KK0114
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| Research Category |
Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
EPRON Daniel 京都大学, 農学研究科, 教授 (60844305)
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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2021-10-07 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2022: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2021: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Keywords | Soil methane / Rubber plantation / Southeast Asia / Fertilization / Nitrogen cycling / Microbial ecology / Fertilisation / Soil nitrogen cycling / Soil microbial ecology / Soil methane uptake / Soil nitrogen / Hevea plantation / Tree water use |
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| Outline of Research at the Start |
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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| Outline of Final Research Achievements |
The objective of this joint international project was to have a deep insight into the effect of fertilization on atmospheric CH4 uptake by the soil of rubber plantations because of its positive role in mitigating climate change. Two types of interaction between fertilization and CH4 uptake are expected. Our first hypothesis that fertilization increases the diffusion of CH4 in the soil due to a higher rate of transpiration of trees in fertilized plots, promoting its oxidation, was rejected. Our second hypothesis was that fertilization increases inorganic nitrogen and available phosphorus in the soil, which inhibits methanotrophic activity when concentrations become high, was confirmed. In addition, we showed that fertilization also enhanced methanogenesis.
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| Academic Significance and Societal Importance of the Research Achievements |
Fertilization inhibited methanotrophic activity and stimulated methanogenesis, decreasing the strength of the CH4 sink of a rubber plantation, and
turns the plantation from a sink to a source of CH4 at the high rate of fertilizer application. The loss of soil CH4 uptake should be evaluated
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