Abstract: Based on the analyses of water quality monitoring data of over 120 hydrometric stations in the Yangtze River System during the last 30 years, the effect of lithology and climate (rainfall) on major ion chemistry of the river water has been studied by means of statistical approaches such as principal component analysis (PCA) and correlation analysis.

Key words: Yangtze River, major ion chemistry, lithology

摘要： 在分析长江流域120余水文站点近30年水质监测数据的基础上，运用主成分分析、相关分析等数理统计方法研究岩性和气候条件(降水量)对长江水系河水主要离子化学的影响。

关键词: 长江, 主要离子化学, 岩性条件