RELATIONSHIP AMONG DIFFERENT FORMS OF PHOSPHORUS IN SEDIMENTS AND INTERSTITIAL WATER IN TYPICALLY INNER-CITY HYPER-EUTROPHIC LAKE

The system of sediment-interstitial water in typical inner-city hyper-eutrophic lake in Wuhan City was studied.Sediments of this system were sequentially extracted in natural granularity.The result showed that there was a good linear relationship between organic matter(OM) and org / bact P contents in sediments.This organic matter in sediments was the source of org / bact P.The total phosphorus in sediments dominated the content of total dissolved phosphorus and phosphate in interstitial water.In addition,there were good relatiohships between total phosphorus in sediment and the total dissolved phosphorus in interstitial water,and between total phosphorus in sediment and phosphate in interstitial water.Fe-P and Al-P in sediments were correlative with Eh and phosphate in interstitial water,respectively.This showed that the Fe-P and Al-P contents were affected by Eh in interstitial water and the total content of Fe-P and Al-P dominated the content of phosphate in interstitial water.Through studying the system of sediment-interstitial water in typical inner-city hyper-eutrophic lake,the experimental result has theorectical value in controlling phosphorus release from sediments to the water in these lakes.