广西姚村地下河水化学特征及其时空变化

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,SO₄^2-,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。

Temporal and Spatial Distribution of the Hydrochemical Characteristics of Yaocun Underground River in Guangxi Province

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, SO₄^2-, 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.