2022 Fiscal Year Final Research Report
Consequences of intensive maize cultivation on soil microbiome and efficient nitrogen cycling in sub-Saharan Africa
| Project/Area Number |
18KK0183
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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 41:Agricultural economics and rural sociology, agricultural engineering, and related fields
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
多胡 香奈子 国立研究開発法人農業・食品産業技術総合研究機構, 農業環境研究部門, 上級研究員 (20432198)
山本 昭範 東京学芸大学, 教育学部, 准教授 (20733083)
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| Project Period (FY) |
2018-10-09 – 2023-03-31
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| Keywords | サブサハラ / 窒素循環 / 土壌微生物 / 硝化 / 機能遺伝子 |
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| Outline of Final Research Achievements |
The purpose of this study is to evaluate the seriousness of soil degradation in Sub-Saharan Africa based on the function and diversity of soil microorganisms involved in the nitrogen cycle, and to clarify their resilience due to the application of organic matter. For this purpose, field surveys were carried out to determine the actual state of soil degradation. We clarified the changes in soil physicochemical properties associated with soil conditions, and conducted soil gene analysis in collaboration with overseas researchers. We discovered that microbial communities diversified due to agricultural land development, and that this was related to the improvement of microbial functions such as nitrification. Furthermore, we clarified that some of the microbial species and functions that respond to agricultural land development depend on the soil sampling site, but that there are species and functional genes that respond in common regardless of the sampling site.
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| Free Research Field |
環境生命地球化学
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| Academic Significance and Societal Importance of the Research Achievements |
サブサハラ・アフリカ土壌の農地開発によって特異的に増える、もしくは減る硝化菌グループが存在する可能性を示唆するデータを得ることができた。この結果はサブサハラ・アフリカ農地の土壌炭素欠乏がどのように低減できるか、または農地開発によって土壌炭素やその他栄養素の枯渇が起きないようにするための経営指針に繋がる基礎情報となった。
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