ABSTRACT
In order to know the horizontal distribution and seasonal variation characteristics of phosphorus species in surface sediment, the contents of different phosphorus species in the surface sediment sampling from Shantou Bay were determined by using the SMT sequential extraction method in September and November, 2008, and June, 2009. The contents of different phosphorus species basically showed an order of the low-water period, normal-water period and high-water period from high to low, and horizontal distributions of phosphorus species showed a decrease trend as waves from the inner bay to the outer bay with the maximum appeared in Niutianyang. The main form of total phosphorus in sediment was inorganic phosphorus, which accounted for 94.06%, and the content of Ca-P was the highest in all inorganic phosphorus of the surface sediment in Shantou Bay, comprising 70.21%, followed by Ads-P, Fe-P and De-P. The correlation analysis among different phosphorus forms suggested that they had similar sources and they were affected by surface runoff and seasonal variation. OP, Fe-P and Ads-P were bioavailable phosphorus, which were controlled by sources and water oxidation-reduction potential; while Ca-P and De-P were mainly influenced by biological processes and geological characteristics.
