Change characteristics of major ions and their influence factors in Yangtze Estuary in recent years
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摘要: 通过对2004-2008年长江口徐六泾江水样品中主要离子（Ca2+，Mg2+，Na+，K+，HCO32-，SO42-，Cl-，NO3-和SiO32-）含量的月观测,以及对2008年9月长江下游调查,研究发现,长江河口水体主要离子浓度与径流呈现很好负相关关系，季节变化明显，但主离子浓度季节差异小于径流量的季节差异.河口水体中K+，Na+，Ca2+，Mg2+，Cl-，SO42-，NO3-，总硬度/总碱度有上升趋势，尤其以SO42-，和总硬度/总碱度的上升趋势显著，SiO32-，HCO3-则表现出下降趋势.引起近年来长江口水体主离子浓度变化的影响因素为工业排放、环境酸化、循环盐和三峡蓄水等.Abstract: The geochemistry of major ions(Ca2+，Mg2+，Na+，K+，HCO32-，SO42-，Cl-，NO3-和SiO32-)in the Yangtze River was studied, based on the monthly monitoring data at Xuliujing station for the period of 2004-2008 and the investigation result of the Yangtze River in September 2008. The study found that the concentration of main ions varies clearly in different seasons, with a negative correlation with the discharge of the River. But the difference of the concentration is less clearly than that of the discharge. There is a persistently increasing in the concentrations of K+, Na+, Ca2+, Mg2+, Cl-, NO3-, SO42-and the ratio of hardness/alkalinity; especially the concentration of SO42-and the ratio of hardness/alkalinity have a more obvious increasing trend. In contrast, the concentration of SiO32-and HCO3-show a decreasing trend. The changes of major ions mainly result from the environment acidification, the pollution emissions by human, the cyclic salt from sea, the preserved effect by reservoirs establishments etc.
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