Study on Verification of Reduction Function of Nutrient Load in the River by an Off-stream Type of Irrigation Pond

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  • オフ・ストリーム型ため池による河川の栄養塩類流出抑制効果の実証および考察
  • オフ ストリームガタ タメイケ ニ ヨル カセン ノ エイヨウ エンルイ リュウシュツ ヨクセイ コウカ ノ ジッショウ オヨビ コウサツ

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A case study on the Hoji Pond and its source river (the Todoroki) located at Konoyama area, Kishiwada, south part of Osaka prefecture, Japan indicated demonstratively that irrigation pond, even though it is a "off-stream type" without continuous inflow from the source river, could reduce nutrient load in the source river through the regular operation for irrigation. It was resulted that the annual average of the reduction ratios for each form of nutrient (Nitrogen and Phosphorus) loads in the river were 36% for T-N, 42% for D-N, 52% for T-P, 46% for D-P, and 62% for P-P. For P-N load, there were several months when the output from the pond exceeded the input to the pond, so that the pond had contributed negatively though it was very slight. The result of additional survey carried out from June to December 2007 indicated that the negative contribution for P-N load by the pond was due to transformation of D-N into P-N by the growth of phytoplankton in the pond.

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