茂兰喀斯特山区不同土地利用方式下浅层地下水化学组成的变化

Changes of main chemical components in the shallow groundwater under different land utilization forms in Maolan Karst mountainous area

通过对贵州省荔波县茂兰喀斯特山区不同土地利用方式下(阔叶林区、农业区、城镇居民区)的浅层地下水进行调查和采样分析,探讨茂兰喀斯特地区不同土地利用方式下浅层地下水化学组成的变化。结果表明,茂兰喀斯特山区林地地下水离子主要为HCO3-、SO42-、Ca2+、Mg2+,其分别占离子总量的66.77%、9.68%、17.38%、5.46%。从林地-农用地-城镇居民地的变化过程中,NH4+、NO3-、SO42-、Cl-、PO43-浓度出现显著增加,Ca2+、HCO-占离子总量的百分数呈明显的下降,而SO2-占离子总量的百分数则出现明显的上升。

The investigation for the changes of main hydrochemical components in shallow groundwater under different land utilization forms in Maolan Karst mountainous area of Libo County （ Guizhou Province） was carried out in the current study. The result showed that the main ions containing in groundwater were HCO3^-, SO4^2- , Ca^2＋ and Mg^2＋ , and the contents were 66.77% , 9.68% , 17.38% , and 5.46% , respectively. The contents of NH4^＋ , NO3^-, SO4^2- , Cl^-, or PO4^3- were obviously highest in the undergroud water of city, followed by that of agricultural land, and that of the forestland ranked the lowest. Conversely, the tendency of Ca^2＋ or HCO3^- contents were reverse.