华东师范大学学报(自然科学版) ›› 2010, Vol. 2010 ›› Issue (2): 34-42.

• 环境工程 地理学 • 上一篇    下一篇

近年来长江口水体主离子的变化特征及影响因素分析

李丹,邓兵,张国森,张莹莹
  

  1. 华东师范大学 河口海岸学国家重点实验室,上海,200062
  • 收稿日期:2009-01-16 修回日期:2009-06-29 出版日期:2010-03-25 发布日期:2010-03-25
  • 通讯作者: 李丹

Change characteristics of major ions and their influence factors in Yangtze Estuary in recent years

LI Dan,DENG Bing,ZHANG Guosen,ZHANG Yingying   

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  • Received:2009-01-16 Revised:2009-06-29 Online:2010-03-25 Published:2010-03-25
  • Contact: LI Dan

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.

关键词: 长江, 化学风化, 三峡工程, 循环盐, 工业污染, 长江, 化学风化, 三峡工程, 循环盐, 工业污染

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.

Key words: chemical weathering, the Three Gorges Project, cyclic salt, industrial pollution, the Yangtze River, chemical weathering, the Three Gorges Project, cyclic salt, industrial pollution