Water geochemical characteristic variations in and around a karst-dominated natural reserve area,southwestern China |
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| Authors: | Mingming Jing Wei Chen Tingting Zheng Yuan Liao Julia Ellis Burnet Min Xu Chen Yang Lina Shen Mingzhong Liang |
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| Institution: | (1) MOE Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, People’s Republic of China;(2) School of Environmental Studies, China University of Geosciences, Wuhan, People’s Republic of China;(3) Institute of Karst Geology, China Academy of Geological Sciences, Guilin, People’s Republic of China;(4) School of Environment and Resource, Guangxi Normal Teaching University, Nanning, People’s Republic of China;(5) Faculty of Environmental Science, University of Nova Gorica, Nova Gorica, Slovenia;(6) Present address: Department of Water Resources Engineering, Lund University, Lund, Sweden; |
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| Abstract: | This paper reports original data on the physical and chemical parameters of precipitation, river water and groundwater in
and around the Longhushan Nature Reserve Area, located in southwestern China karst region, and provides a preliminary characterization
of the hydrogeochemical process governing the natural water evolution in this area. The rainfall and river water mainly pertain
to the HCO3
−–Ca2+ type and groundwater mainly pertain to the HCO3
−–Ca2+ + Mg2+ type. The HCO3
− was the predominant anion and Ca2+ was the predominant cation in all waters, respectively. The Gibbs Boomerang Envelop model, the 1:1 relationship of Na+ plus K+ versus Cl− as well as the 1:1 relationship of Ca2+ plus Mg2+ versus HCO3
− all suggested geochemical weathering is the main controlling factor for the geochemical compositions of this natural water.
In surface water, the Mg2+/Ca2+ ratios ranged from 0.32 to 0.42 and the Na+/Ca2+ varied between 0.04 and 0.05. In the groundwater, the Mg2+/Ca2+ ratios varied from 0.37 to 0.62 and were below the ideal ratio of 0.8. These ratios showed the presence of a dolomite source.
Analysis of trace elements showed that As, B, Pb, Se, Sr, V and Zn elements were abundant in the natural water during summer
in this region. |
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