摘要
2012年4月9-16日在桂江流域采集河流水样15个进行分析测试。研究结果表明:(1)桂江河水样品pH值介于6.36～8.46,平均值为7.58;EC范围为18～316μs/cm,平均值为175μs/cm;流域河水SIc平均值为-0.7,其变化受流域碳酸盐岩的分布控制。(2)桂江的水为HCO3-Ca型水,HCO3-和Ca2+平均分别占阴、阳离子的76%和77%,主要来自岩石风化。(3)中游部分河水NO3-和SO24-较高,可能是受工农业等人类活动的影响引起,此外硫酸参与了碳酸盐矿物的溶解。(4)Ca2+、Mg2+和HCO3-总体呈现中游高,上游和下游较低;SO24-和NO3-仅在中游部分受到人类活动影响较多的支流偏高,上下游相对较低且相差不大;Cl-、Na+和K+则呈现出中下游较高,上游较低的特征。
Chemical characteristics of 15 river water samples from the Guijiang are analyzed in April 9--16, 2012. The results show that： （1） The pH values of the river water average in 7.58 and range from 6.36 to 8.46; EC average in 175μs/cm and range from 18 to 316μs/cm; the Sic average in --0.7 and change in ac- cordance with the distribution of carbonate rocks in the basin; （2） The hydrochemistry type belongs to HCO3 --Ca, and the average HCO3- and Ca2＋ contents, accounting for 76% and 77% of all the anions and cations respectively on average, mainly originate from the weathering of rocks; （3） The values of NO3- and SO42-, possibly being affected by human activities such as agriculture and industry, are a little higher in the middle reaches of the Guijiang river; （4） Because of the influence of carbonate rock, the contents of Ca2＋ , Mg2＋ and HCO3- are higher in the middle reaches and lower in the upstream and downstream generally. The contents of SO^- and NO3-are higher only in the tributaries that affected by human activities in the middle reaches. The contents of Cl-, Na＋ and K＋ are higher in the middle and lower reaches, but relatively lower in the up- per reaches.
出处
《中国岩溶》
CAS
CSCD
2012年第4期395-401,共7页
Carsologica Sinica
基金
中国地质调查局工作项目“中国岩溶碳汇动态评价”(1212011087122)
关键词
桂江流域
河流
水化学
岩溶
Guijiang basin
rivers
hydrochemistry
karst
