Agricultural non-point source pollution is one of the important causes of water environmental pollution.To identify the spatial distribution of agricultural non-point source pollution and carry out regional control is the premise of agricultural non-point source pollution prevention and control.The pollution sources,pollutants and their spatial distribution characteristics of agricultural non-point sources in Henan Province in 2020 were analyzed by using inventory analysis,equal standard pollution load method and cluster analysis method.The results were as follows:1)the main pollution sources of agricultural non-point sources in Henan Province were chemical fertilizer application and livestock and poultry breeding,and the COD emission of pollutants was the largest,and the total comprehensive emission was the highest in Nanyang City.The pollution of agricultural non-point source showed strong regional differentiation in Henan Province.The pollution of fertilizer application was mainly concentrated in Zhoukou City,and Nanyang City was the most serious in livestock breeding.The highest isostandard pollution index was Puyang City.2)Through cluster analysis,Henan Province was divided into three primary non-point source pollution control zones:high,moderate and mild risk zones,and on this basis,subdivided into seven secondary non-point source pollution control zones,and targeted prevention and control countermeasures for agricultural non-point source pollution in Henan Province were provided to provide reference for the classification and control of agricultural non-point source pollution in Henan Province.
关键词
农业面源污染/河南省/控制分区/等标污染指数/时空特征
Key words
agricultural non-point source pollution/Henan Province/control zones/equal standard pollution index/spatial-temporal features
维普
万方数据