Identification of nitrogen contamination mechanisms of groundwater in coastal areas of Central Vietnam by using microbial technologies and stable isotope analyses
| 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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Report
(4 results)
Research Products
(25 results)
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[Presentation] Identification of nitrogen contamination mechanisms of groundwater in coastal areas of Central Vietnam2017
Author(s)
Maeda, M., Kiba, H., Hyodo, F., Chikamori, H., Inoue, D., Le, T.V., Nguyen, H.D.
Organizer
Okayama University - Hue University Joint Symposium on Education and Research Programs for Environmental and Agricultural Sciences
Related Report
Int'l Joint Research
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