Cumulative ecological risk assessment of pesticides using a simulation model (PADDY-Large) and species sensitivity distribution (SSD): Application to a tributary of the Sakura River under rice cultivation

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  • シミュレーションモデル（PADDY-Large）と種の感受性分布（SSD）を用いた複数の農薬使用に伴う累積的生態リスク評価手法の開発： 茨城県南部桜川支流域における水稲栽培への適用
  • シミュレーションモデル(PADDY-Large)ト タネ ノ カンジュ ショウブンフ(SSD)オ モチイタ フクスウ ノ ノウヤク シヨウ ニ トモナウ ルイセキテキ セイタイ リスク ヒョウカ シュホウ ノ カイハツ : イバラキケン ナンブザクラガワ シリュウイキ ニ オケル スイトウ サイバイ エ ノ テキヨウ

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<p>We developed a quantitative assessment method for aquatic ecological risks from pesticides under conventional and special paddy-rice cultivation (CONV and SP) or with the implementation of various techniques to reduce pesticide runoff from paddy fields. Predicted environmental concentrations (PECs) of the pesticides in a watershed were calculated using the PADDY-Large model. The multi-substance potentially affected fraction (msPAF) of pesticides was estimated using the computation tool for cumulative ecological risks (NIAES-CERAP). The insecticide msPAF of 0.5% for the SP was lower than that of 16% for the CONV. Meanwhile, the herbicide msPAF of 20% for the SP was higher than that of 14% for the CONV. The overall PAF of 10% for the CONV was decreased to 7% for the SP with the decrease in the number of pesticides used. The overall PAF of 6% for the CONV under a regulated low drainage and seepage condition was as much as that for the SP.</p>

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