2013 Fiscal Year Final Research Report
IMPACT OF CONTINENTAL RIVER INUNDATION TO FERTILIZATION AND VEGETATION
| Project/Area Number |
22404008
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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 |
Hydraulic engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
KAZAMA SO 東北大学, 工学(系)研究科(研究院), 教授 (50272018)
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| Co-Investigator(Kenkyū-buntansha) |
OMURA Tatsuo 東北大学, 大学院工学研究科, 教授 (30111248)
UMEDA Makoto 東北大学, 大学院工学研究科, 准教授 (10447138)
MASAGO Yoshifumi 東北大学, 大学院工学研究科, 助教 (50507895)
NAKANO Kazunori 日本大学, 工学部, 准教授 (30292519)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | 洪水 / 点源負荷 / 水理モデル / メコン河 / 栄養塩 |
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| Research Abstract |
To evaluate fertilization of the Mekong River flood and inundation, we observed nutrient concentrations of flood water and nutrient amounts of soil at paddy fields located in the Mekong River flood plain and calculated nutrient balance. We obtained the following conclusions; 1) Sluice gate is more effective system than rubber gate at the point of nutrients utilization because water at the level of a lower layer has much nutrient due to the deposition. 2) Nutrient balance calculation expresses that the amounts of nutrients contained in soil and inundation water are sufficient to provide for rice production.3) The contribution ratio of flood to rice production that is presented in "the nutrients amount brought by inundation/the nutrients amount included in the harvested rice" are 98%, 50%, 88% and 17% about nitrate at Kandal, phosphorus at Kandal, nitrate at Takeo and phosphorus at Takeo respectively.
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