| This paper calculated the main source, pollution load of agricultural non-point source pollution in Chongqing using list analysis method, and then analyzed influencing factors, spatial distribution characteristics, and pollution causes using clustering analysis, linear regression and empirical research. The scale of the research was based on the county level, and the scope of study was in line with the regional division of economic function, which included 37 agricultural districts and counties of Chongqing. The results showed that among the average water pollutant concentration, the COD was 11.995 mg/L, TN was 2.043 mg/L, and TP was 0.457 mg/L, the comprehensive water quality index was 1.989, which was within the scope of the light pollution and very close to the moderate pollution. The agricultural non-point source pollution around downtown was serious. Straw, excrements of livestocks, and chemical fertilizer were the main sources of pollution, which contributed 44.65%, 45.47%, 7.23%, respectively. Cluster analysis showed that the pollution in Yongchuan, Rongchang, TongLiang, Dazu, Changshou, Bishan county was very serious. Rural electricity consumption, crop planting area and total surface water resources had a strong influence on the pollution load. On the basis of the analysis of the pollution load spatial feature and the empirical investigation, the corresponding countermeasures and suggestions were put forward. |
