龙子湖表层沉积物磷的赋存形态及生物有效性

Species and Bioavailability of Phosphorus in Surface Sediments of Longzihu Lake

利用磷的连续分级提取方法,将龙子湖表层沉积物中的磷分为弱吸附态磷、铁结合态磷、自生磷灰石磷及碳酸钙结合态磷、碎屑态磷灰石磷、有机磷5种不同的形态,研究了表层沉积物不同赋存形态磷的分布特征,并探讨了其生物有效性。结果表明,龙子湖表层沉积物中总磷的含量为199.5-727.5 mg·kg-1,其中有机磷约占总磷的31.8%,其余68.2%以无机磷的形式存在,而无机磷中又以自生磷灰石磷及碳酸钙结合态磷为主。磷的生物有效性分析结果显示,蚌埠龙子湖表层沉积物中潜在的生物有效性约为107.73-523.81 mg·kg-1,磷的释放潜力较大。

Species and bioavailability of phosphorus in the surface sediments from Longzihu Lake were in- vestigated using the sequential extraction method in this paper. The different forms of sedimentary phos- phorus were studied in Longzihu Lake, which are the forms of loosely adsorbed phosphorus, Fe bound phosphorus ,authigenie apatite phosphorus and calcium carbonate-bound phosphorus, detrital phosphorus and organic phosphorus. It was shown that total phosphorus in sediments varied from 199.5 -727.5 mg·kg^-1 that was mainly in the form of inorganic phosphorus dominated by authigenic apatite phosphorus and calcium carbonate-bound phosphorus. Organic phosphorus and inorganic phosphorus accounted for 31.8% 107.73 -523.81 mg·kg^-1 ,the potentiality of phosphorus release is greater.