Loss characteristics and risk assessment of agricultural non-point source pollution in the middle and lower Yangtze region
In order to explore characteristics of agricultural non-point source pollution in the middle and lower Yangtze region,the diffuse pollution estimation with remote sensing model(DPeRS)was used to calculate agricultural non-point source pollution loads in this study.And pollution risk assessment method considering pollution thresholds was developed to identify high risk area of agricultural non-point source pollution.Furthermore,the influencing factors of agricultural non-point source pollution were analyzed.In 2023,the total nitrogen and phosphorus loads of agricultural non-point sources pollution in the middle and lower Yangtze region were 10.70 kg·hm-2 and 0.50 kg·hm-2,respectively.And the high agricultural non-point source pollution areas were mainly distributed in Hunan,Hubei,Jiangxi and Jiangsu provinces.The proportions of agricultural non-point source pollution with slight,mild,moderate,strong,severe and extremely severe pollution risks were 30.33%,43.66%,15.96%,4.70%,2.25% and 3.10%,respectively.The statistical analysis showed that precipitation and fractional vegetation cover were key influencing factors of agricultural non-point source pollution.The correlation coefficients between precipitation and agricultural non-point source total nitrogen load in Anhui,Hunan and Jiangsu provinces were higher than 0.18(P<0.05),and the correlation coefficient between fractional vegetation cover and agricultural non-point source total phosphorus load in Jiangxi Province was-0.21(P<0.01).Results indicate that high-intensity agricultural activities and high precipitation increase the pollution risk of agricultural non-point source pollution in the middle and lower Yangtze region.The combination of agricultural non-point source pollution loads and water pollution thresholds can improve the accurate identification of high risk areas and provide valuable information for formulating effective agricultural non-point source pollution management strategies.
agricultural non-point sources pollutionDPeRS modelpollution riskremote sensingmiddle and lower Yangtze region
万方数据
维普
