渤海湾表层沉积物磷形态分析

用JEN SEN等(1998)六步分离法对2003年11月和2004年5月渤海湾采集的沉积物样品进行P形态分析,结果表明:沉积物营养盐水平与地理环境有关。总的趋势是沉积物越细,粘土含量越高,营养盐水平就越高。渤海湾表层沉积物磷呈现从潮间带向渤海湾大面站增大的局势,污染近岸高,远岸低。渤海湾表层沉积物中的P主要以FAP和R ef磷为主,FAP占整个P形态的43%以上,R ef占24%以上,其次是L ea-P,此种形态的P平均约占5%左右,最后依次是F e-P、CFAP和L sor-P,这三种形态含量都小于10%以下。这表明渤海湾沉积物中的P的主要来源是陆源输入和污水排入。渤海湾表层沉积物中有一半以上的磷不能被生物利用。

The Analysis of the Phosphorus Forms in the Sediment of Bohai Bay

By Using six-steps sequential chemical extraction methods(JENSEN et al,1998),the sedimentary samples collected in Bohai Sea in November 2003 and May 2004 were analyzed with Phosphorus forms.The results show that the nutritional level of sediments is related to the geographical environment,and increases with the grain-size of sediments becomes smaller and the content of clay gets higher.Surficial sediment phosphorus is increasing from eulittoral zone to the station in Bohai Bay,which the pollution is serious in offshore.With analysis of phosphorus forms,the contents of various phosphorus(P) was positively correlated with the different environment.Detrital apatite(FAP) and refractory organic phosphorus(Ref) were main components among the six phosphorus forms in Bohai Bay sediments.FAP accounted for 43 percent among six phosphorus forms,Ref accounted for 24 percent.Followed leachable organic phosphorus by the average content accounted for 5 percent,then iron-bound inorganic phosphorus(Fe-P),authigenic apatite(CFAP),loosely adsorbed inorganic phosphorus,the contents of these three kinds of phosphorus forms all accounted for under 10 percent.It showed that the main sources of phosphorus in Bohai Sea sediments were land input and sewage drainage,and more than half of sedimentary phosphorus in the Bohai Bay wasn't degradated biologically.