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中文摘要：
利用磷的连续分级提取方法,研究了长江口沙洲沉积物中磷的赋存形态分布特征,并探讨了沉积物中磷的生物有效性.结果表明,沙洲沉积物中总磷的含量为437.6～1103.7μg·g^-1,其中79.5%以无机磷的形式存在,而无机磷中以碎屑态磷灰石磷为主;有机磷约占总磷的20.5%.磷的生物有效性分析结果显示,潜在的生物有效性磷主要包括弱吸附态磷、铁结合态磷和有机磷等3种赋存形态,而长江口沙洲沉积物中潜在的生物有效性磷含量较少,约为60.5～510.9μg·g^-1,平均仅占沉积物总磷的28.86%.
英文摘要：
Species and bioavailability of phosphorus in the sediments from the shoals in the Yangtze Estuary were investigated using the sequential extraction method. It was shown that total phosphorus in sediments varied from 437. 6-1103.7μg·g^-1 and was mainly in the form of inorganic phosphorus dominated by detrital phosphorus. Inorganic phosphorus and organic phosphorus accounted for c. 79.5% and 20.5% of total phosphorus, respectively. 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 60.5-510.9 μg·g^-1 and occupied c, 28. 9% of the sedimentary phosphorus pool.
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