Spatial Distribution and Characteristics Analysis of Agricultural Non-point Source Pollution in Shaanxi Section of the Weihe Basin
This study aims to investigate the causes of agricultural non-point source pollution in Shaanxi section of the Weihe River Basin,clarify the spatial distribution of pollutants,and accurately evaluate the current situation of agricultural non-point source pollution in the region.In this paper,the pollution production coefficient method and qual-standard pollution load method were used to calculate the pollutant discharge,isostandard pollution discharge and emission intensity of agricultural non-point source pollutants in Shaanxi section of Weihe River Basin in 2021.The natural fracture method and ArcGIS software were used to analyze the ecological sensitivity of pollutant emission intensity generated by 4 types of pollution sources,namely rural life,farmland fertilizer,livestock and poultry breeding and aquaculture.The results showed that in 2021,the total emissions of agricultural non-point source pollutants in Shaanxi section of the Weihe River Basin was about 3.256 million tons,included 1.422 million tons of COD,1.291 million tons of TN,and 0.543 million tons of TP.The pollution intensity for COD,TN,and TP was 2936 kg/km2,2665 kg/km2,and 1121 kg/km2,respectively.The characteristics of agricultural non-point source pollution emission in the Shaanxi section of the Weihe River basin were mainly farmland fertilizer sources,and livestock and poultry breeding sources.The pollution was spread in a circular pattern,with the highest levels near the central counties.This study can help with strategies to manage non-point source pollution in the region and guide local efforts to protect the environment and adjust agricultural practices.
万方数据
维普
