Simulation on Characteristics of Agricultural Non-point Source Pollution in the Zhuzhaoxin River Basin
Aiming at the problem that the characteristics of agricultural non-point source pollution can not be directly monitored,taking the Zhuzhaoxin River Basin in Heze city,Shandong province as the research area,SWAT model was constructed to simulate the runoff,total nitrogen and total phosphorus load in the study area,the spatial-temporal distri-bution characteristics of agricultural non-point source pollution were analyzed,and the key source areas and types of agri-cultural non-point source pollution were identified.The results show that the determination coefficients and Nash coeffi-cients of runoff,total nitrogen and total phosphorus in the calibration and verification periods can meet the accuracy requirements of SWAT model.The agricultural non-point source pollution load in the study area has little inter-annual change,and the agricultural non-point source pollution mainly occurs in the wet season,that is,from July to October.The pollutant load shows an obvious decreasing trend in the dry season and the normal season.The pollutant load in the middle and lower reaches of the basin is larger than that in the upper reach.The key source areas of agricultural non-point source pollution are concentrated in the middle and lower reaches of the basin and the southern part of the basin.Livestock and poultry farming is the main non-point source of pollution,and the amount of pollutants into the river accounts for 85.16％of the total amount of pollutants.
agricultural non-point source pollutionSWAT modelrunofftotal nitrogentotal phosphorusthe Zhuzhaoxin River Basin
NETL
NSTL
万方数据
维普
