本文沉积物的取样范围,北起35°15′N,南至长江北口的江苏近岸浅水区(水深一般小于20米)。这里有举世瞩目的辐射状沙脊群。笔者对该区表层沉积物中的碳酸盐(以CaCO_3表示)、磷(以 P_2O_5表示)和有机质作了相关回归分析。并利用这三种化学成分的三元比率图,显示出以孢粉组合和粘土矿物类型所划三个沉积区的物质来源。 The sampling area of ​​sediment in this paper ranges from 35 ° 15’N on the north to shallow water in Jiangsu’s estuary to the north of the Yangtze River (water depth is generally less than 20 meters). There are radiant sand ridges that attract worldwide attention. The authors made a correlation analysis of carbonate (expressed as CaCO_3), phosphorus (P_2O_5) and organic matter in the surface sediments of this area. The ternary ratio maps of these three chemical compositions are used to show the source of the material in three sedimentary areas plotted by sporopollen assemblages and clay mineral types.