[Objective]The aim of the study was to analyze pollution receiving capacity and reduction for Yanghe reservoir watershed.[Method]Based on statistical analysis of the Yanghe River reservoir watershed pollutant load,according to the mathematical model of water environment,combined pollution,water quality status and water quality management objectives of watershed sub basin control unit,the annual average and 50% guarantee rate and 75% guarantee rate under the condition of water pollution indexes of sub basins(TN,control unit TP,COD,NH3-N)and the reduction of pollutant carrying capacity was calculated.[Result]The pollution receiving capacity of mean annual precipitation were the largest,the water environmental capacity of TN,TP,COD,NH3-N were respectively 428.26,144.19,1 845.28,182.56 t/a;the maximal quantity of pollutant reduction were reservoir and Xiyanghe watershed,they would be the key area for watershed pollution management.[Conclusion]The study can provide a theoretical basis for prevention and mitigation of non-point pollution in Yanghe reservoir basin.%[目的]分析洋河水库流域纳污能力及消减量.[方法]在统计分析洋河水库流域污染物负荷量的基础上,根据水环境数学模型,结合流域内各个子流域控制单元的污染状况、水质现状和水质管理目标,计算多年平均、50%保证率和75%保证率水量条件下各个子流域控制单元的主要污染指标(TN、TP、COD、NH3-N)水体纳污能力及消减量.[结果]多年平均水量条件下TN、TP、COD、NH3-N的水环境容量分别为428.26、144.19、1 845.28、182.56 t/a;库区和西洋河支流的污染物消减量最大,为今后重点污染治理的区域.[结论]该研究可为洋河水库流域面源污染防治及消减提供理论依据.
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