Form characteristics of phosphorus and its releasing potential in the sediments of Daya bay
To understand the effect of phosphorus released from sediments to water of the semi-enclosed bay,the characteristics of phosphorus forms,critical influences and the temperal-spatial differences of phosphorus releasing potential were studied in the surface sediments of Daya bay.The results showed that the average concentration of total phosphorus (TP) in sediments was 429.65 × 10-6.Inorganic phosphorus (IP) and organic phosphorus (OP) were 286.57 × 10-6 and 143.08 × 10-6,respectively.IP accounted for 67.83％ of TP.Acid-extracted phosphorus (HClP) was the main component in IP,and the average concentration of HCl-P and alkali-extractive phosphorus (NaOHP) were 237.10 × 10-6 and 56.13 × 10-6,respectively.Biological effective phosphorus (OP + NaOH-P) accounted for 45.63％ of TP.There was a high releasing potential of sediments phosphorus in Daya bay.In addition,there was a clear temperal-spatial distribution pattern that the releasing potential of phosphorus was higher in summer than that in winter and,higher in near-shore than that in offshore or bay mouth.The grain size,Eh,content of organic matter (especially those from phytoplankton blooms) had an important influence on releasing potential of sediment phosphorus.
phosphorus formstemperal-spatial variationreleasing potentialsedimentsDaya bay
NETL
NSTL
万方数据
维普
