中文摘要：

选取密云水库上游太师屯镇为研究区,在利用输出系数法计算非点源污染负荷的基础上,运用环境经济学方法,定量估算了非点源污染损失。研究结果表明：本区养殖污染负荷最高,总氮占全镇总氮污染负荷的53.0%,其中规模化养殖占畜禽排泄污染负荷的66.5%;总磷占全镇总磷污染负荷的73.9%,其中规模化养殖占畜禽排泄污染负荷的66.5%。农村生活污染的总氮负荷占全镇总氮污染负荷的31.3%,总磷占全镇总磷污染负荷的15.8%。土地利用污染负荷最低,总磷和总氮分别占全镇总负荷的15.7%和10.3%。区域非点源污染损失折合人民币约407.57万元,其中畜禽养殖污染损失最大,约占总损失的40.7%;土地利用流失次之,占33.5%,其中63.2%的损失是耕地污染造成的;农村生活污染损失最小,但总氮损失达总损失的25%。氮、磷养分流失是主要的非点源污染形式,损失约占79.5%。土地废弃和泥沙淤积造成的污染对水库存在长期影响,也不可忽视。

英文摘要：

Taishitun Town, located at the upper catchment of Miyun Reservoir, Beijing, was selected as a case study. Based on the calculation of non-point source pollution load, using the export coefficient method, economic loss caused by agricultural non-point source pollution was reckoned quantitatively, using the methodology of environmental economics. Results show that livestock breeding contributed the most to the pollution load of the area, and 53.0% to the TN and 73.9% to the TP pollution load of the town. Of the TN and TP contributions of the livestock rearing, 66.5% in both was attributed to large-scaled farming. Rural area domestic pollution contributed 31.3% to the TN and 15.8% to the TP pollution load of the town. The pollution load from various land uses was the least, contributing 15.7% of the TP and 10.3% of the TN pollution load of the town. The economic loss the regional non-point source pollution caused was calculated at a- bout 4.08 million RMB in total, of which about 40.7% was attributed to livestock breeding, ranking first, and 33.5% （ of which 63.2% was caused by farming pollution） to various land uses and soil loss, ranking second. Rural area domes- tic pollution contributed the least to the economic loss, but 25% of the TN loss. N and P loss is the main form of non-point source pollution, accounting for 79.5% of the economic loss. The long-term impact of surface soil loss and sediment deposition cannot be neglected.