The Change of TN,TP and COD in Representative Water Body of Tai-Ge valley

This paper dealed with 25 monitoring station , monitored the contents of TN,TP and COD in 6 kinds of water body on the west of Taihu valley between Taihu lake and Gehu lake, which lasted for one year. The result showed that the average contents of TN and TP in 6 kinds of water body in low water season were higher apparently than that in high and normal water season. In low water season, the contents of TN of the water in Taihu lake, the water in the river that arrive to Taihu lake and that around the livestock and poultry breeding plant were higher than that in the other water body, and the contents of TP of the water around residential area and livestock and poultry breeding plant were higher than that in the other water body. In low water season, the water body, which contents of COD were higher than the others, were the water around aquiculture site and residential area; in high water season, that were the water in Taihu lake, the water around cropland and residential area;and in normal water season, that was the water around aquiculture site.