摘要
赤水河上游流域处于我国西南喀斯特岩溶地貌广泛发育的地区,其河流的水化学组成代表了典型喀斯特地区河流的水化学组成。对河水的各离子含量分析表明,赤水河上游河水水化学组成以Ca2+、HCO3-离子为主,其次为Mg2+、SO42-,表现了典型喀斯特地区河流的特征。上游河水的Na+/(Na++Ca2+)、Cl-/(Cl-+HCO3-)比值较低,所有水样都落在GIBBS图的左中端,河水水化学组成主要受岩石风化控制。阴阳离子三角图及河水中的主要元素的比值对比分析表明,河水水化学组成主要受碳酸盐岩风化溶解控制。水化学的时空对比分析表明,农业活动等人为活动对河水的化学组成有一定影响。
The upper Chishui River basin is situated in the karst-cave highly developed region of southwest China; its water chemical composition could represent that of the typical rivers in karstic areas. Thus a thoroughly study was conducted about the river-water＇s ions content and the chemical characteristics on the basis of a survey including sampling and analysis in dry season, which showed that ions of Ca2＋ and HCO3- were the main ones in the studied river-water, followed by Mg2＋ and SO42-. The analysis indicated all of the water samples fall within the mid-left side of Gibbs distribution graph, with very low Na＋/（Na＋＋Ca2＋） and Cl-/（Cl-＋HCO3-） ratios, which suggested that the water chemical composition of the Chishui river water mainly controlled by rock weathering; and the analysis on the ratio of anion/cation triangular diagram and major ion element of the river-water showed that the water chemical composition was mostly controlled by weathering of carbonate rocks. Spatial-temporal analysis suggested that human activities such as agricultural activities have exerted a certain influence on the chemical composition of the river water.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第8期117-122,共6页
Environmental Science & Technology
基金
贵州省科技厅重点实验室建设项目资助(黔科合计Z字[2012]4012)
贵州省自然科学基金资助(黔科合SY字[2013]3133
黔科合J字[2013]2130号)
贵州大学博士基金资助(Z045015)
博士后基金(2014M552388)
关键词
赤水河上游
水化学
碳酸盐
岩石风化
upper Chishui River basin
water chemistry
carbonate rocks
rock weathering
