福州西湖沉积物磷形态及释磷潜能分析

采用SMT法(standards,measurements and testing harmonized protocol)分析了福州西湖表层沉积物磷的赋存形态和垂直方向溶解性磷质量浓度梯度.结果表明,福州西湖表层沉积物总磷质量比在711～1 654 mg/kg之间,沉积物中以无机磷为主,活性较大的有机磷和铝/铁形态磷的质量分数为70%～90%,表明沉积物具有较大的释放磷潜能;沉积物间隙水与上覆水体之间存在明显的总磷和溶解性磷的质量浓度梯度,在外源磷负荷减少的情况下,溶解性磷将从间隙水扩散到上覆水体,影响福州西湖水体的富营养化水平.

Phosphorus Forms of the Surface Sediment and the Release Potential in the West Lake of Fuzhou

It analyzed the surface sediment phosphorus species using SMT method and the release poten- tial in the West Lake of Fuzhou.The results showed that the total phosphorus concentrations of the surface sediment are from 711 to 1 654 mg/kg and the inorganic phosphorus was the major phosphorus species in the sediment.The active organic and the Al/Fe bounded phosphorus occupied from 70% to 90% of the total phosphorus,which indicated the sediment had a large phosphorus releases potential.A gradient of the reac- tive soluble phosphorus occurred at the sediment-water interface which indicated that SRP could diffuse from sediment into the overlying water.The results suggested that a considerable potential P could be released from the sediment to the water when the burden of the outside became less which would influence the water quality of West Lake.