The Evaluation and Identification of the Prior Regions for Agriculture and Rural Non-point Pollution Control in Qingzhen

The inventory analysis method and the equivalent standard method were employed to evaluate the different types of rural non-point source pollutants i.e.chemical fertilizer,animal husbandry and rural sewage in Qingzhen,a central city of Guizhou province.It showed that TN,TP and COD emissions from agricultural and rural pollution sources were 13.09×103,3.63×103,50.36×103 t/a,respectively,while their emission intensity were 6.42,8.86,1.08 t/km2,respectively.The primary pollution source was animal husbandry,which has 70.84% value in equivalent standard method.The primary pollutant is TP,and its load ratio was 54.15%.The sensitivity evaluation identified that the town of Hongfenghu and Baihuahu were the prior regions for agriculture and rural pollution control,and the prevention of rural non-point source pollution caused by animal husbandry should be intensively implemented.