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A laboratory experiment was carried out to study the effects of sediment dredging on phosphorus (P) release from lake sediments using incubation of undredged (control) and dredged cores through a year. We found that dredging the upper 30cm layer of the sediment can efficiently reduce the interstitial PO4 3--P concentration and different P forms in the sediment. The P fluxes of the undredged and dredged cores ranged from -237.3 to 3047.6μg/(m2·d) and -143.8 to 14.4μg/(m2·d), respectively. The fluxes of the dredged cores were generally lower than those of the undredged (control) cores, with significant(P<0.05)differences between the fluxes of the dredged and undredged cores occurring between March and October of 2006. The sediment P in the dredged cores had a lower release potential than those in the control cores. Our results suggested that dredging may be a useful approach for decreasing internal P loading in Lake Taihu once the external P loading is effectively controlled in advance.

Environmental effect of sediment dredging in lake (I): the role of sediment dredging in reducing internal phosphorous release