中文摘要：

利用连续分级提取方法，对天津汉沽海域表层沉积物中P的含量水平、赋存形态、及其生物有效性进行了分析。结果表明：表层沉积物中TP的含量在525．68×10^-6～688．39×10^-6之间，平均含量约为618．18×10×10^-6其中86．98％以IP的形式存在；而在IP中，FA．P是其主要的赋存形态，平均约占TP的59．54％；IP含量范围为48．52×10^-6～146．72×10^-6，平均约占TP的13．02％。P的生物有效性分析结果显示，潜在的生物有效P主要包括Ads-P、Fe-P和OP等3种赋存形态，而天津汉沽海域表层沉积物中潜在的生物有效P含量约为465．87×10^-6～609．79×10^-6，平均约占沉积物TP的89．14％，表明研究区域内沉积物具有很强的释P潜力。

英文摘要：

Species, contents and bioavailability of phosphorus in surface sediments from the sea area of Hangu in Tianjin were investi- gated using a sequential phosphorus extraction method. The results showed that the total phosphorus in the surface sediments were 525.68 ×10^-6 -688.39 ×10^-6 and were dominated by inorganic phosphorus which on average accounted for 86.98% of total phos- phorus. Among the species of inorganic phosphorus, detrital phosphorus was its dominant form which on average occupied 59.54% of total phosphorus. It was also found that bioavailable phosphorus in sediments mainly included loosely adsorbed phosphorus, Fe-bound phosphorus and organic phosphorus. Bioavailable phosphorus at the study area varied from 465.87×10^-6to 609.79×10^-6 , accounting for 89.14% of the sedimentary phosphorus pool. This observation reflected that sediments from the sea area of Hangu had a strong a- bility of release phosphorus into the pelagic water.