Abstract:

In the present study,the vertical variation of different phosphorus forms were investigated in both sediment and interstitial water samples from three typical sites in Lake Donghu.The results showed that:(1) the highest concentration of TP was found at the most polluted site near the outfall of domestic sewerage (site I),and the lowest concentration of TP was detected at the center of Lake Donghu (siteⅡ);(2) the major and the minimal forms of TP were iron bounded phosphorus (FeP,accounted for 3885%5914%) and liable phosphorus (LP,accounted for 027%149%),respectively;(3) the high concentration of mobile phosphorus was detected,and the result indicated that the sediment in Lake Donghu could become a potential sourse for phosphorus release;(4) high concentration gradient of PO3-4 between interstitial water and overlying water was detectived,but it is not the determinant factor of the exchange of phosphorus between interstitial water and overlying water of Lake Donghu