| Project/Area Number |
15H05255
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Rural environmental engineering/Planning
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| Research Institution | Okayama University |
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Principal Investigator |
Maeda Morihiro 岡山大学, 環境生命科学研究科, 教授 (00355546)
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| Co-Investigator(Kenkyū-buntansha) |
近森 秀高 岡山大学, 環境生命科学研究科, 教授 (40217229)
井上 大介 大阪大学, 工学研究科, 准教授 (70448091)
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| Research Collaborator |
Nguyen Duc Huy フエ大学, バイオテクノロジー研究所, 副所長
Le Van Thang フエ科学大学, 准教授
Hoang Ngoc Tuong Van フエ大学, 環境資源研究所, 研究員
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2015: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Keywords | 窒素 / 地下水汚染 / 安定同位体比 / 国際情報交換 / 微生物機能 / ベトナム / 水質汚濁・土壌汚染防止・浄化 / 土壌現象 / 土壌学 / 微生物 / 農業工学 |
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| Outline of Final Research Achievements |
In the downstream agricultural areas of Central Vietnam, high concentrations of NH4-N and NO3-N were found in groundwater. Results of 15N natural abundance of different nitrogen forms indicated that the groundwater contamination was attributed to unintended inflow of livestock wastes and/or domestic wastewater. Soil functional genes related to the nitrogen cycle were largely different between farms and dry/rainy seasons and were not clearly linked to the groundwater contamination, suggesting that the composition of nitrogen-cycling genes does not directly have a significant influence on the groundwater contamination. Moreover, we developed an integrated water and material circulation model composed of rainfall-runoff, unsteady river flow and groundwater models for analyzing the nitrogen dynamics in groundwater of the study areas.
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