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根据我国水利部水文年鉴和全球水质监测计划中国站点的水化学资料，对长江中游干流主要水文站和四川与贵州省境内长江主要支流下游的水文站自６０年代初至８０年代中期（个别站点至９０年代中期）的主要离子含量资料进行了统计分析，发现这些站点在主要离子含量变化趋势方面存在着共同的特点，即：碱度有所降低，钙离子和硫酸根离子含量有所升高，相应地，总硬度与总碱度的比值也有所升高．将这一现象产生的原因与我国西南地区酸雨对生态环境的影响结合起来进行讨论，指出这是酸不敏感地区陆地水水质对酸沉降的响应．
According to the hydrochemistry data of China’s Ministry of Water Resources Yearbook and the Global Water Quality Monitoring Plan, the main hydrological stations in the middle reaches of the Yangtze River and the hydrological stations in the downstream of the main tributaries of the Yangtze River in Sichuan and Guizhou Province from the early 1960s to the mid-1980s In the mid-90s, the data of major ion content were statistically analyzed. It was found that these sites have the common characteristics in the trend of the main ion content: the alkalinity decreased, the content of calcium ion and sulfate ion increased, Accordingly, the ratio of total hardness to total alkalinity also increased. The reason of this phenomenon is combined with the impact of acid rain on the ecological environment in Southwest China. It is pointed out that this is the response of terrestrial water quality to acid deposition in acid-insensitive areas.