The temporal and spatial characteristics and pollution source of agricultural non-point source pollution in Shaanxi Province
In order to clarify the spatiotemporal characteristics,key pollution sources,pollution areas,and pollution types of the agri-cultural non-point source pollution in Shaanxi Province,the export coefficient method(ECM)was used to estimate the pollution load of total nitrogen(TN)and total phosphorus(TP)in 11 urban areas of Shaanxi Province from 2010 to 2019,and the equal standard pollution load method was adopted to evaluate the pollution sources.The 11 urban areas were divided into agricultural non-point source pollution types using the rapid clustering method.The results showed that from 2010 to 2019,the agricultural non-point source pollution TN and TP pollution load in Shaanxi Province showed a trend of first increasing and then decreasing.In 2019,the pollution load of TN and TP were the lowest,at 129 027.14 and 13 872.84 t,respectively;in 2019,the equal standard pollution load ratios for livestock and poultry breeding,agricultural planting,and rural life in Shaanxi Province were 20.923％,60.130％and 18.947％,re-spectively;the spatial distribution of equal standard pollution load for different pollution sources TN and TP showed strong consistency.Among the 11 urban areas,the equal standard pollution load ratios for the agricultural non-point source pollution in descending order were Yulin City(16.94％),Hanzhong City(15.42％),Ankang City(13.06％),Weinan City(12.93％),Xianyang City(9.28％),Shangluo City(8.31％),Baoji City(8.18％),Yan'an City(7.03％),Xi'an City(6.89％),Tongchuan City(1.74％),and Yangling Demonstration Zone(0.24％);the agricultural non-point source pollution in 11 urban areas could be divided into four types:agricul-tural planting pollution dominant type,agricultural planting+rural life pollution dominant type,agricultural planting+livestock and poultry breeding pollution dominant type,and mixed pollution type.
agricultural non-point source pollutiontemporal and spatial characteristicspollution loadequal standard pollution loadpollution sourceShaanxi Province
万方数据
维普
