通过对长江口潮滩植物生物量及根际沉积物中磷的赋存形态和含量的研究,结果表明各个采样点的海三棱草从春季开始生长并一直延续到初夏,到7月其生物量基本上都达到一个峰值。海三棱草根际沉积物中磷的赋存形态包括弱吸附态磷(Ad-P)、铁结合态磷(Fe-P)、自生磷灰石及钙结合态磷[(Ap+Ca)-P]、碎屑态磷(De-P)和有机磷(OP),它们都具有较好的季节性变化,在一定程度上都受到氧化还原状态的控制。文中还研究了根际沉积物孔隙水中的磷酸盐含量,发现其有效性受到了氧化还原状态及沉积物中铁的影响。 Through the study on the plant biomass and the species and content of phosphorus in the sediments of the Yangtze River Estuary, the results showed that the species of P. trifoliata began to grow from spring to early summer at each sampling point. Basically, the biomass has reached a peak. The phosphorus forms in the rhizosphere sediments of S. trifoliata include Ad-P, Fe-P, authigenic apatite and calcium-bound phosphorus [(Ap + Ca) -P], de-P and organic phosphorus (OP), all of which have good seasonal changes, to a certain extent, by the redox state control. In the paper, the phosphate content in pore water of rhizosphere sediments was also studied, and its effectiveness was found to be affected by redox status and iron in sediments.