Distribution of phosphorus and bio-available phosphorus forms and their relationship in the sediments from different regions of Lake Taihu

采用EDTA螯合剂法和不同的化学提取法,研究了太湖3个不同营养水平湖区中8个位点表层沉积物总磷、各组分磷及生物可利用磷的含量分布,探讨了太湖不同营养水平湖区表层沉积物的释磷潜力和生物可利用磷的来源.结果表明,太湖不同营养水平湖区表层沉积物总磷、无机磷和生物可利用磷含量分布差异较大,且与各湖的营养水平相-致.有机磷含量与有机质和含水率显著相关;沉积物中Fe-P和Ca-P对生物可利用磷的贡献较大,这部分磷具有较大的潜在释放风险.;Concentrations of total phosphorus (TP), their fractions and the bio-available phosphorus(BAP) in the surface sediments From three different regions of Lake Taihu are investigated. In addition, the potential release capacify of P from the surface sediment and their sources were discussed. The concentrations of TP, P fractions an BAP are coincided very well with their trophic states. The concentrations of organic P in the sediments have a good relationship with organic matter and moisture content. BAP is mainly from Fe bound P(Fe-P) and Ca hound P(Ca~P), which show the highest potential risk of release.