为合理估算太湖流域非点源污染营养盐输出负荷，通过GIS空间分析能力，构建半分布式的输出系数模型，进而测算出太湖流域营养盐输出负荷。结果显示太湖流域总氮面源污染负荷为39．81万t/年，总磷面源污染负荷为5．59万t/年。太湖流域5分区中总氮、总磷面源污染负荷依次为北部污染控制区＞浙西污染控制区＞西部污染控制区＞南部污染控制区＞东部污染控制区。%It is very important to estimate the nutrient export loads from watershed ,which is beneficial to management of water environment .These estimation results showed that:the total nitrogen load of non-point source pollution in Taihu lake watershed is 398 100 tons/a,the total phosphorus load is 55 900 tons/year.The total nitrogen,total phosphorus loads of non-point source pollution in the five areas are in the order of:the north pollution area>the west Zhejiang pollution area>the west pollution area>the south pollution area>the east pollution area .Moreover,the total nitrogen pollution mainly comes from the cultivated land ,the total phosphorus pollution mainly comes from the land for construction purposes .
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