水田におけるリン浸透排出推定のためのモデル化

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  • Modeling for Simulating Phosphorus Percolated Outflow in Paddy Fields
  • スイデン ニ オケル リン シントウ ハイシュツ スイテイ ノ タメ ノ モデ

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説明

A mathematical model was built for estimating the phosphorus percolated outflow from paddy fields in terms of operating variables such as irrigation flow rate, percolation flow rate, irrigation water quality and fertilizing. This model Consists of balance equations for surface water, soil section of slow percolated flow and quick percolated flow (Mizumiti: water paths), and rate equations for adsorption, desorption, bioturbation and other relevant rate processes.<BR>Six experiments using lysimeters under various paddy field conditions were carried out to estimate the structure and verify validity of this model.<BR>The proposed model could simulate phosphorus concentration in percolated water under various conditions with enough accuracy, reflecting annual changes. Stability of the model with respect to the deviation of the parameters was checked by means of a sensitivity analysis. The proposed model will be applicable to estimate phosphorus outflow in actual paddy fields with extending the boundary conditions.and the parameters to larger paddy fields.

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