Risk level zoning and countermeasures for agricultural non-point source pollution in Hunan Province
We explored the risk level zoning and control measures for agricultural non-point source pollution,which used the equivalent standard pollution load method and GIS spatial analysis method to fully grasp the pollution situation in Hunan Province.Based on the equivalent pollution load of land area and the pollution load per unit of surface runoff,this paper analyzed the data of the sources,types,and spatial distribution of agricultural non-point pollution sources in Hunan Province from 2018 to 2021.The results showed that the TN pollution load of agricultural non-point sources was the highest,with the contribution rate more than 40%from 2018 to 2020.The value was generally higher at the center of the province and gradually decreased in the surrounding area.The risk level of Hunan Province can be zoned into three levels,i.e.,high-risk areas,medium-risk areas,and low-risk areas,via natural discontinuity grading method.The pollution sources can be divided into six types,i.e.,livestock and poultry farming pollution type,rural domestic sewage pollution type,rural domestic sewage livestock and poultry breeding pollution type,rural domestic sewage planting pollution type,planting livestock and poultry breeding pollution type,and combined pollution type.The control measures of agricultural non-point source pollution in Hunan Province were put forward according to 14 sub-regions based on the above six source types.
国家科技期刊平台
NSTL
万方数据
