典型黑土区非点源污染控制途径研究

利用SWAT模型,以东北典型黑土区农业小流域为研究对象,探索流域农业非点源污染的控制途径。根据吴家屯小流域地形和生产力的空间异质性规律,采用流域内施肥空间调整、深松机械除草、修建草地缓冲带等措施的情景模拟分析,并将其与农田粗放管理模式进行对比,结果表明:施肥空间调整和田间管理优化可以有效地降低产流、产沙和N、P养分的流失,是控制流域内农业非点源污染的重要途径。

Control Ways of Non-point Pollution of Typical Chernozem

The paper explores the control ways of agricultural non-point pollution by using SWAT model,taking an agricultural small watershed in typical chernozem of the northeast as a research object.It adopts the modes of spatial readjustment of fertilization,subsoiling with weeding by machine,building lawn buffer zones to make situation simulation analysis,and comparison with the extensive management pattern based on the laws of topography and spatial heterogeneity of productivity in Wujiatun Small Watershed.The outcomes show that both spatial readjustment of fertilization and optimization of field management can effectively reduce runoff yield,sediment production and losses of N and P nutrient and is of an important control way for agricultural non-point pollution of the watershed.