An Analysis of Agricultural Non-Point Source Pollution Types and Contribution Rate of the Beiyunhe River Basin in Beijing

The Beiyunhe River Basin is selected as a case study.According to an analysis of data from statics and survey,the pollution load and the contribution rate of main non-point source pollution are fixed.This paper presents the corresponding pollution control measures to settle the major problems.Results show that the biggest contributor of CODcr pollution load is household refuse,accounting for 38%.The biggest NH+4-N pollution load was agricultural production,accounting for 43%.Livestock breeding contributed the most to the pollution load of the area,and 53% to the TN and 74% to the TP.The pollution load of Tongzhou District and Changping District are significantly higher than that of other districts.