以广西黎塘姚村地下河为研究对象,通过对丰水期(6月份)、平水期(9月份)、枯水期(12月份)各采样点的地下水进行水化学研究,揭示了姚村地下河的水化学组成,探讨其水化学性质时空变化。结果表明:在空间上,电导率、Ca2+ 和Mg2+ 浓度自地下河上游至下游逐步升高,地下河出口处(3#采样点)电导率远高于其他点(丰水期589 μS/cm、平水期634 μS/cm、枯水期614 μS/cm);在时间分布上,pH值,SO42-,NO3-浓度季节变化明显,地下河出口处(3#采样点)的NO3- 浓度在枯水期有明显升高;研究区地下水的化学性质受岩溶作用的强弱程度以及农业活动的影响。
Abstract
With the underground river at Litang county of Guangxi province as a research object, we revealed the hydrochemical compositions of Yaocun underground river and discussed its temporal and spatial distribution by analyzing groundwater samples collected in wet season (June), normal flow season (September), and dry season (December). Results showed that 1) in space scale, the conductivity and the concentrations of Ca2+ and Mg2+ gradually increased from the upstream to the downstream, and in particular, the conductivity of the underground river’s outlet (point No.3) was higher than that of other positions, reaching 589 μS/cm in wet season, 634 μS/cm in normal flow season, and 614 μS/cm in dry season; 2) while in time scale, the concentrations of pH, SO42-, NO3- varied with season, and NO3- concentration at underground river’s outlet in dry season was higher than that in other seasons; 3) the hydrochemical characteristics of the research area are influenced by karst degree and agricultural activities.
关键词
岩溶水 /
地下河系统 /
水化学特征 /
岩溶作用 /
农业活动 /
广西黎塘姚村
Key words
karst water /
underground river system /
hydrochemistry characteristics /
karstification /
agriculture activities /
Yaocun at Litang county of Guangxi Province
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基金
国家自然科学基金项目(40772164);中国地质调查局地质调查项目(1212011121164);环境保护公益性行业科研专项(2013A035);中国地质科学院岩溶地质研究所基本科研业务项目(2015008)
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