Based on the results of national survey of pollution sources, the production and emission characteristics of pollutants from agricultural activities and the major control measures of agricultural non-point source pollution in Suzhou along the Yangtze River, Taihu Lake and Yangchenghu Lake were analyzed and demonstrated. The results showed that among the non-point source pollutants, the totalamount of nitrogen and phosphorus emitted were 11 878.9 and 1 343.8 t respectively, pesticides loss was 28.0 t, plastic membrane residual was 203.9 t, the volume of straw burned was 214 000 t, total amount of COD emitted by livestock breeding, aquaculture and rural community was 92 360.3 t; The emission amount of nitrogen and phosphorus along the Yangtze River was the largest followed by Taihu Lake, along the Yangcbenghu Lake the lowest. According to the analysis of the total amount of N and P emitted, the ranking of pollutant resource was as below: rural community ＞ livestock breeding ＞aquaculture ＞ planting; The pollution intensity caused by the four sources were different. The three watershed, the pollution intensity of farming, animal husbandry and rural communities was greater in the Yangtze River, but the pollution intensity of aquaculture was greater in Taihu Lake Therefore,in guiding concept for the prevention and control of no point source pollution, the government should pay close attention to the Yangtze River, give more weight to domestic pollution sources. In view of the above -mentioned facts,to control agricultural non-point source pollution. Some proposals were offered as follows, concentrating superior resources to dispose rural sewage, optimizing the agricultural industry structure, strengthening the ecological construction, comprehensively treating livestock pollution, promoting the utilization of crop straw resources,and reasonably planning aquaculture etc.%利用提供的区城产排污系数,对苏州市沿长江、太湖和阳澄湖流域农业面源污染的现状及其区域差异进行分析.结果表明,苏州市农业面源污染中氮(TN)、磷(TP)环境排放总量分别为11 878.9和1 343.8 t,农药流失28.0 t,地膜残留203.9 t,秸秆焚烧量为21.4万t,畜禽养殖、水产养殖和农村社区共排放化学需氧量(COD)92 360.3 t;市辖3大流域中,沿长江流域氮、磷养分排放量最大,沿太湖流域次之,沿阳澄湖流域排放量最低;从不同污染源排放氮、磷总量来看,农村生活源＞畜禽养殖业源＞水产养殖业源＞种植业源;4种污染源强度在各流域间有一定的差异,种植业、畜牧业和农村社区在长江流城产排污强度较大,而水产养殖业产排污强度则在太湖流域表现较大.因此,建议集中优势资源处理农村生活污水,结合产业结构优化,生态功能建设,畜禽养殖污染的综合治理,作物秸秆资源化利用,水产养殖合理规划等措施全面防控农业面源污染.
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