利用SWAT模型对三峡库区典型小流域——陈家沟小流域农业非点源污染进行模拟。在建立SWAT模型基础数据库和确定其适应性的基础上,分析研究区农业非点源污染空间特性。结果表明:(1)陈家沟小流域年均产沙量4763.41t,年均总氮输出量8.27t,年均总磷输出量0.79t;(2)非点源污染相对较为严重的区域分布于流域出水口处、流域中部两个集中汇水区和南部高海拔区,可划定为非点源污染的关键源区;(3)单位面积非点源污染负荷量较大的土地利用方式是旱地和水田;(4)削减化肥施用量可有效减少总氮、总磷输出量。 Using SWAT model to simulate agricultural non-point source pollution in a typical catchment-Chenjiagou catchment in the Three Gorges Reservoir area. On the basis of establishing the basic database of SWAT model and determining its adaptability, the spatial characteristics of agricultural non-point source pollution in the study area are analyzed. The results show that: (1) The annual sediment yield in Chenjiagou watershed is 4763.41t, the annual average total nitrogen output is 8.27t, the annual average total phosphorus output is 0.79t; (2) The distribution of non-point source pollution is relatively serious At the outlet of the river basin, two central catchment areas in the central part of the basin and southern high-altitude areas can be designated as key source areas for non-point source pollution; (3) Land-use patterns with large non-point source pollution load per unit area Is dry land and paddy field; (4) reduce the amount of chemical fertilizer can effectively reduce the total nitrogen, total phosphorus output.