东海特定海区柱状沉积物中磷的存在形态及其环境指示意义

Variations in Different Forms of Phosphorus in the Sediments of East China Sea and its Environmental Indicative Significance

对国家海洋二所1998年5月调查过程中采自长江口外特定海区的柱状沉积物样品进行了系统的总磷及各形态磷分析。邻近长江口、杭州湾的MESO站位,总磷(TP)、铁结合态磷(Fe-P)和有机磷(OP)均高于其它站位,表明来自长江、钱塘江水系的污染物已对东海海域的环境造成了一定影响。在垂直方向上,各站位TP、OP和Fe-P的含量自下而上增高,此外,Fe-P和OP由于还原溶解与生物降解等作用,倾向于进入孔隙水,参与海洋磷的再循环。吸附态磷(Ad-P)与钙结合态磷(Ca-P)的含量向上递减,与成岩期自生磷灰石的沉淀,以及磷的吸附—解吸附再平衡有关。

By means of SEDEX, ASPILA and XRF, depth-dependent changes of different phosphorus forms in sediment cores from specific areas of offshore Changjiang Estuary (Yangtze Estuary) in 1998 have been analyzed. The results showed that the contents of total phosphorus (TP), organic-phosphorus (OP), iron-phosphorus (Fe-P) were decreased down-core, while that of adsorbed-phosphorus (Ad-P) and calcium-phosphorus (Ca-P) were increased. The distribution tendency of detritus-phosphorus (De-P) was not obvious. Results also showed that TP, Fe-P and OP contents at MESO station of Changjiang Estuary and Hangzhou Bay were higher than that of other stations. This indicated that the pollutants carried by Changjiang River and Qiantang River from inland have affected the natural environment in offshore area. TP, Fe-P and OP contents of each station became higher from bottom to top, indicating the amount of the terrestrial pollutants carried by the two rivers have been enhanced since last decades. Ad-P, Ca-P, Fe-P and OP were all active phosphorus in the sediments, and their re-cycling in sediment was closely related to each other.