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对1991年至2000年间深圳内陆和近岸水产养殖业的排污量进行估算,分析其演变趋势,并对同时期深圳市的点源污染和农业面源污染进行了比较,结果表明:(1)深圳市水产养殖业排污也是深圳近海水体富营养化主要成因之一,自1994年之后其对近海水体污染有加重趋势;(2)在农业面源中,畜禽养殖业排污量最大,其次是水产养殖,再次是农田化肥流失排污;(3)在点源污染中,城市生活污水已成为主要污染源,工业废水排污在点源污染中的比重有较大程度的降低;4)点源污染与面源污染相比,在排放COD量的比例上,前者是后者的两倍多,在排放TN量所占比例上,二者相近,在排放TP所占比例上,前者小于后者。
This paper estimates the discharge of inland and near-shore aquaculture in Shenzhen from 1991 to 2000, analyzes its evolution trend, and compares the point-source pollution and agricultural non-point source pollution in Shenzhen in the same period. The results show that: (1 ) Shenzhen Aquaculture Sewage Discharge is also one of the major causes of eutrophication of offshore waters in Shenzhen. Since 1994, its pollution to offshore waters has been aggravating. (2) Among agricultural non-point sources, the discharge of livestock and poultry aquaculture is the largest, followed by Is the aquaculture, and again the loss of farmland fertilizer runoff; (3) In the point source pollution, urban domestic sewage has become the main source of pollution, the proportion of industrial wastewater discharge in point source pollution has been greatly reduced; 4) Point source pollution Compared with non-point source pollution, the proportion of discharged COD is more than twice that of the former, and the proportion of discharged TN is similar, and the proportion of discharged TP is smaller than that of the former.