Abstract
In order to estimate nonpoint source pollution loading of the Chaohu Lake Basin, the total nitrogen, total phosphorus of sediment, soil and water samples in five typical sub-catchments have been measured. Combining with routine monitoring data of the five sub-catchments of the Chaohu Lake, emission of nonpoint source pollution from these catchments were described and estimated with the reformative practical-mean concentration method. The results indicated that nonpoint source pollution contributed 79 % total phosphorus and 58 % total nitrogen to total loading. Thus, nonpoint source pollution was the primary cause of degrading water quality of the Chaohu Lake. The total nitrogen and total phosphorus were mainly from Hangbu-fengle River and Nanfei-dianbu River. Therefore, among five effluents of the Chaohu Lake, Hangbu-fengle River and Nanfei-dianbu River were the dominant sources for degrading water quality of the Chaohu Lake.
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