生态学杂志2018，Vol.37Issue(3)：667-678,12.DOI:10.13292/j.1000-4890.201803.031
赤水河流域水化学特征与岩石风化机制
Hydrochemical characteristics and chemical weathering processes in Chishui River Basin
摘要
Abstract
Chishui River,the only tributary without the dam in the upper reaches of Yangtze River,is of importance for better understanding solute transportation in rivers and the chemical weathering processes.In this study,we investigated the hydrochemical characteristics of the mainstream and major tributaries and its major driving factors in Chishui River Basin.Mass balance and forward model approach were applied to calculate the contribution of different end-members,the chemical weathering rates,and the atmospheric CO2 consumption rates in the river.The results showed that cations of the rivers were dominated by Ca2+ and Mg2+.The contributions of cations derived from atmospheric input,human activities,silicate weathering,and carbonate weathering were 12％,3％,9％ and 77％,respectively.The anions of the rivers were dominated by HCO3-and SO42-.The Chishui River water had higher SO42-and lower HCO3-concentrations compared with Yangtze River and Wujiang River.The weathering rates and CO2 consumption rates of silicate were estimated to be 7 t · km-2 · a-1 and 1.7×105 mol · km-2 · a-1,respectively,which were similar to those in other rivers located in karstic areas of southwest China.The weathering rates and CO2 consumption rates of carbonate were estimated to be 57.6 t · km-2 · a-1 and 4.52×105 mol · km-2 · a-1 after excluding the impacts of sulfuric acid in weathering reactions,respectively.The weathering rates increased to 74.6 t · km-2 · a-1 and CO2 consumption rates decreased to 1.74× 105 mol · km-2 · a-1 when considering the sulfuric acid as a carbonate weathering agent.The results suggested that the carbonate weathering rates increased by 30％ due to the involvement of sulfuric acid.Due to higher concentration of SO42-and lower concentration of HCO3-in water,CO2 consumption rates were lower in the Chishui River compared to other rivers in karstic areas of southwest China.关键词
水化学/化学风化/CO2消耗/喀斯特流域/赤水河Key words
water chemistry/chemical weathering/CO2 consumption/karst basin/Chishui River引用本文复制引用
徐森,李思亮,钟君,苏靖,陈率..赤水河流域水化学特征与岩石风化机制[J].生态学杂志,2018,37(3):667-678,12.基金项目
国家重点研发计划项目(2016YFA0601000)和国家自然科学基金项目(41571130072)资助. （2016YFA0601000）
