采用SEDEX方法对2006年7月北部湾南部海区调查过程中采集的表层沉积物中的总磷(TP)及各种磷的赋存形态进行了系统性分析,同时结合沉积物及上覆水的环境参数,讨论了磷的地球化学特征.磷(P)的6种地球化学赋存形态分为:弱吸附态(Ads-P)、铁结合态(Fe-P)、自生磷灰石及钙结合态(Ca-P)、碎屑态(De-P)、有机态(OP)及硅酸盐态(SIF-P).研究表明,沉积物的TP主要源于海区内部生物地球化学过程,陆源输入影响较弱,具有保守性;Ca-P是上覆水体中活性磷酸盐(DIP)的汇;SIF-P是上覆水体中颗粒磷(PP)的汇;沉积物的粒度(GSL)是控制P形态含量重要因子;盐度(S)是影响Fe-P的含量变化的重要因子;Ca-P、De-P、SIF-P是沉积物中的"惰性磷",Ads-P、Fe-P、OP是沉积物中的"活性磷".Total phosphorus and its related forms in the surface sediments of Southern Tonkin Gulf were systematically analyzed by SEDEX method.Along with environmental parameters of sediments and overlying waters,the geochemistry characters of phosphorus were discussed.Six different geochemistry existing forms of phosphorus were Ads-P,Fe-P,OP,Ca-P,De-P and SIF-P.The results showed that the total phosphorus(TP) mainly came from biogeochemical processes of Sea Area,which was weakly influenced by terrestrial input,thus often remained constant.Ca-P and SIF-P were the sinks of the active phosphorus(DIP) and the particle phosphorus(PP) of overlying waters,relatively.Grain size(GLS) was the key factor controlling the concentrations of phosphorus in the sediment,while the concentrations of Fe-P were mainly affected by the salinity of overlying waters.Ca-P、De-P,SIF-P were the "inert phosphorus" of the surface sediments,while Ads-P,Fe-P,OP were regarded as the "reactive phosphorus".国家908专项基金(908-01-ST09)资
