| 长江水质地球化学 |
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| 引用本文： | 陈静生,王飞越,夏星辉.长江水质地球化学[J].地学前缘,2006,13(1):74-85. |
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| 作者姓名： | 陈静生 王飞越 夏星辉 |
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| 作者单位： | 北京大学,环境学院,北京,100871 |
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| 摘 要： | 文章在对1958—1990年期间长江水系191个站点水质监测资料进行统计分析的基础上,研究了长江主要离子的地球化学。结果表明,长江水系各地河水总溶解性固体(TDS)含量的差别达一个数量级(49·7~518·1mg/L),TDS的平均值为205·9mg/L,是全球河流均值的3倍。相比之下,河水TDS含量的季节性变化并不大,尽管河水流量的季节变化很大。长江的主要离子化学主要受岩石风化作用,尤其是碳酸盐矿物的溶解作用所控制。长江中上游的川贵地区酸雨严重。酸雨作用于当地广泛分布的石灰岩和富含碳酸盐的三叠纪砂页岩,导致近半个世纪来长江水质的酸化趋势,使大部分河段SO24-和Ca2+含量增高,总硬度与总碱度的比值增高。
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| 关 键 词： | 长江 水质 主要离子 地球化学 环境变化 |
| 文章编号： | 1005-2321（2006）01-0074-12 |
| 收稿时间： | 2005-11-28 |
| 修稿时间： | 2005年11月28 |
Geochemistry of water quality of the Yangtze River basin |
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| CHEN Jing-sheng,WANG Fei-yue,XIA Xing-hui.Geochemistry of water quality of the Yangtze River basin[J].Earth Science Frontiers,2006,13(1):74-85. |
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| Authors: | CHEN Jing-sheng WANG Fei-yue XIA Xing-hui |
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| Institution: | College of Environmental Sciences, Peking University ,Beijing 100871 ,China |
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| Abstract: | The geochemistry of major ions (Ca~2+, Mg~2+, Na~+, K~+, HCO~-_3, SO~2_4, Cl~- and Si~4+) in the Yangtze River was studied, based on the continuously monitoring data at 191 stations in the drainage basin for the period of 1958—1990. The results show that the total dissolved solid (TDS) concentration in the Yangtze River varies over an order of magnitude throughout the basin (49.7～518.1 mg/L), with a medium TDS concentration of 205.9 mg/L, which is about three times the global average. In contrast, the TDS at a given main-channel station varies only slightly in different seasons with a variation factor less than 2.0, despite substantial water dilution in the summer flood season. The major ion geochemistry of the Yangtze River is mainly controlled by rock weathering, with the anion HCO~-_3 and the cation Ca~2+ dominating the major ion composition, owing to the abundance of carbonate rock in the basin. A persistently increasing trend has been observed in the concentrations of SO~2-4, Ca~2+, and the ratio of total hardness to total alkalinity in the Yangtze River. The water acidification trend mainly occurred in the upper and middle reaches of the Yangtze River and is caused by serious acid deposition owing to the increasing SO_2 emission from coal combustion and the oxidation of increasing nitrogenous fertilizer from farmland. |
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| Keywords: | Yangtze River water quality major ion geochemistry environmental change |
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