Abstract:

Sediment samples in the inlets and outlets of the 31 main rivers around Taihu Lake were collected and used as materials. The contents of total nitrogen (TN), total phosphorus (TP) and total organic matter (TOM) were detected. The results showed that the contents of TN, TP and TOM of Region2 and Region3 were higher than those of Region1 and Region4. The orders of average contents of TN, TP and TOM of the four regions were as the following, for TN: Region 2>Region 3>Region 4>Region 1; for TP: Region 2>Region3>Region4>Region1; for TOM: Region2>Region4>Region1>Region3. The activity of Fe/Al-P was higher than that of other phosphorus fractions. For Fe/Al-P: Region2>Region4>Region3>Region1. As a result, the crucial rivers resulted in the serious eutrophication of Taihu Lake zones(the northern, northwestern and western parts of Taihu Lake) in the decreasing order are Taige Canal, Baidu Port, Chendong Port, CaoqiaoRiver, Zhihu Port, Wujin Port, Guandu Port, Xiaoxi Port, Yincun Port, Hongxiang Port, Jiaodu Port and Wuxi Port. Both TN and TP concentrations in sediment samples of these rivers were fairly high (TN>1000 mg/kg, TP>500 mg/kg).