长江河口硅和磷生源要素质量浓度的变化特征

根据近年来长江河口区域内大通水文站的记录和近期在长江入海河口区上海段多个采样点的生源要素质量浓度实测数据,比较水中可溶性硅酸盐和磷酸盐的质量浓度,分析在长江入海河口区水中硅和磷元素含量的主要变化特征.结果表明,长江水中的硅酸盐和磷酸盐从长江入海河口进入大海的过程中,其质量浓度有降低的趋势,它们在长江入海河口的多年的质量浓度变化趋势是相反的.长江入海河口区域上游的磷酸盐质量浓度升高幅度较大,而硅酸盐变化不大,硅酸盐、磷酸盐质量浓度在长江河口区进入海洋的过程中迅速降低. 

The Mass Concentration Variation of Biogenic Elements Si and P in Changjiang Estuarine Area

According to the recent years' record of biogenic element fluxes at Datong station and the element concentration data measured in the recent days at multiple sites in the Changjiang estuary,the authors compared the change of mass concentration of SiO_3~(2-) and PO_4~(3-).The result shows that the mass concentration of SiO_3~(2-) and PO_4~(3-) in the Changjiang decreases as a whole and the variation trend of mass concentration of SiO_3~(2-) and PO_4~(3-) is adverse.The PO_4~(3-) mass concentration in the Changjiang estuary forepart increases obviously,but that of SiO_3~(2-) changes less.The mass concentration of both elements decreases rapidly when the Changjiang flows from the estuary to the ocean.