LEI Kun¹, HE Shouyang^1,2, LIU Xi¹, AN Yanling^1,2

（1.Key Laboratory of Karst Environment and Geohazard Prevention, Guizhou University, Guiyang 550025, China；
2. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China )

Abstract: Groundwater is an extremely important resource and basic material for human life and natural ecosystems in arid zone of karst areas. Data for groundwater chemistry of Xingren County, Guizhou Province, China were collected to illustrate the characteristics of chemical components, spatial variations and controlling factors. Three chemical types of groundwater were recognized; Ca²⁺, Mg²⁺ and HCO3^- are mainly derived from the dissolution of carbonate rocks and characterized by HCO₃-Ca type and HCO₃-Ca•Mg type; the SO₄^2- are predominated by both dissolution of sulfate evaporates (e.g. gypsum) in karst aquifer and anthropogenic in origin and characterized by HCO₃•SO₄-Ca•Mg type; the K⁺, Na⁺, Cl^- and NO₃^- are principally allochthonous origin. The hydrogeochemical characteristics of groundwater in arid zone of karstic areas are increasingly impacted by human activities. Decreasing human activities impacts on karstic groundwater is a key to protect drink water and groundwater environment.

Key words: karst groundwater; arid zone; hydrogeochemical; human activity; Xingren County

EARTH AND ENVIRONMENT Vol.44, No.6 Tot No.314, 2016, Page 619-627