洪湖流域农业面源污染调查与污染负荷核算

Investigation of Agricultural Non-Point Source Pollution and Estimation of Pollution Loads in Honghu Valley

针对洪湖流域农业面源污染负荷进行了核算研究,并确定了不同污染源对水环境的贡献率。结果表明,洪湖流域入湖污染物总量为CODCr38 372.26 t/年、NH3-N 787.667 t/年、TN 4 349.054 t/年、TP396.106 t/年,农业面源污染负荷估算值为畜禽养殖>水产养殖>居民生活>农田种植,它们对水环境的贡献率分别为39.33%、32.92%、23.33%、4.41%;畜禽养殖CODCr、TN、TP面源污染负荷量最高,分别为18 642.69、2 749.99、296.72 t/年,水产养殖NH3-N面源污染所占比例最大。

The load of agricultural non-point source pollution and the contribution of different pollution sources to water environment of Honghu valley were studied.The results showed that the total amount of CODCr,NH3-N,TN,and TP into Honghu valley were 38 372.26 t/a,787.667 t/a,4 349.054 t/a,and 396.106 t/a respectively.The order of pollution load of different agricultural sources was livestock and poultry > aquaculture > residents life > planting farmland.The contributions of these four agricultural sources were 39.33%,32.92%,23.33% and 4.41% respectively.The load of CODCr,TN,and TP of livestock and poultry were highest,were 18 642.69 t/a,2 749.99 t/a and 296.72 t/a respectively,the NH3-N load of aquaculture was the largest.