| Project/Area Number |
17510021
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental impact assessment/Environmental policy
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| Research Institution | Saitama Univ. |
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Principal Investigator |
SUDO Ryuichi Saitama Univ., Graduate School of Science&Engineering, 大学院理工学研究科, 客員教授 (70109916)
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| Co-Investigator(Kenkyū-buntansha) |
WAKABAYASHI Meiko College of Cross-cultural Communication and Business, 国際コミュニケーション学部, 教授 (90348350)
TANAKA Hitoshi Center for Environmental Science in Saitama, 水環境担当, 専門研究員 (40415378)
KIMOCHI Yuzuru Center for Environmental Science in Saitama, 水環境担当, 主任 (50415379)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Irrigation reservoir / Circumference vegetation / Fallen leaf / Water quality / Lake ecosystem |
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| Research Abstract |
The purpose of this study is to show clearly what kind of difference arises in water quality and internal production over irrigation reservoirs with different forest vegetation of the catchment area. The water quality of irrigation ponds which are distributing over the hilly country in western area in Saitama prefecture was investigated. As a result of comparing the water quality of irrigation reservoirs in which either evergreen conifers (Japanese cedar etc.) or deciduous broad-leaved trees (Japanese oak etc.) are carrying out dominance in the drainage basin, it turned out that there is a difference characteristic of the abundance ratio of inorganic nitrogen ions.
Furthermore, the fallen leaves of Japanese cedar or Japanese oak were supplied to the field test pond made from concrete, and the monitoring of the change of water quality was carried out. As a result, when Japanese cedar was compared with Japanese oak, the concentration of origin substances (Total Nitrogen and Total Phosphorus etc.) from fallen-leaves of Japanese oak was larger than those of Japanese cedar. However, the internal production quantity evaluated by Chlorophyll a was the almost same between Japanese cedar and Japanese oak. Moreover, as a direct bad influence to the water quality of fallen leaves, a possibility of causing the low oxygen condition of lakes water was suggested irrespective of the kind of vegetation.
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