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通过在枯水期对赤水河中下游干流及其支流共25个河水样品进行水化学采样,水化学分析结果表明:在阴阳离子组成中,Ca2+为主要阳离子,占总阳离子的64%以上;阴离子以HCO3-和SO42-为主,占总阴离子75%~91%,其中HCO3-占51%以上。Gibbs图研究区河水化学组成受岩石风化作用控制,阴阳离子三角图、水化学比值分析表明研究区河水化学组成主要受碳酸盐岩风化作用影响,在下游部分支流存在一定硅酸盐岩风化作用。水化学时空分布的对比分析表明,人为活动的对赤水河流域岩石风化速率和水化学组成产生了一定的影响。
Through the chemical sampling of 25 rivers in the middle and lower reaches of the Chishui River during the dry season, the chemical analysis of water shows that Ca2 + is the main cation in the anion and cation compositions, accounting for more than 64% of the total cation. The anion is HCO3- And SO42-, accounted for 75% to 91% of the total anion, of which HCO3- accounted for more than 51%. Chemical composition of river water in Gibbs map area is controlled by weathering of rocks. Triangulation of anions and cations, hydrochemical ratio analysis shows that the chemical composition of river water in the study area is mainly affected by the weathering of carbonate rocks, and some silicate weathering occurs in the tributaries of the downstream part . The comparative analysis of spatio-temporal distribution of water chemistry shows that anthropogenic activities have certain influence on rock weathering rate and chemical composition of water in Chishui River basin.