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1引言所谓农业面源污染,是指农村地区在农业生产和居民生活过程中产生的、未经合理处置的污染物对水体、土壤和空气及农产品造成的污染,具有“面广、点多、源杂、分散隐蔽、不易监测、难以量化”的特点。近年来,随着经济社会的不断发展,农业面源污染问题日益突出,被广为关注。与点源污染相比,面源污染不确定性更大,成分、过程更复杂,更难以控制,已成为农
1 Introduction The so-called agricultural non-point source pollution refers to the rural areas in the process of agricultural production and resident life arising from the unidentified disposal of pollutants on water, soil and air and agricultural products caused by pollution, with a wide range of “ , Mixed source, scattered hidden, difficult to monitor, difficult to quantify ”features. In recent years, with the continuous development of economy and society, the problem of agricultural non-point source pollution has become increasingly prominent and has drawn much attention. Compared with point source pollution, non-point source pollution is more uncertain, composition, process more complex and more difficult to control, has become a farming