Effects of Land Use on Hydrochemistry and Contamination of Karst Groundwater from Nandong Underground River System, China
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The Nandong Underground River System (NURS) is located in Southeast Yunnan Province, China. Groundwater in NURS plays a critical role in socio-economical development of the region. However, with the rapid increase of population in recent years, groundwater quality has degraded greatly. In this study, the analysis of 36 groundwater samples collected from springs in both rain and dry seasons shows significant spatial disparities and slight seasonal variations of major element concentrations in the groundwater. In addition, results from factor analysis indicate that NO 3 − , Cl−, SO 4 2− , Na+, K+, and EC in the groundwater are mainly from the sources related to human activities while Ca2+, Mg2+, HCO 3 − , and pH are primarily controlled by water–rock interactions in karst system with Ca2+ and HCO 3 − somewhat from anthropogenic inputs. With the increased anthropogenic contaminations, the groundwater chemistry changes widely from Ca-HCO3 or Ca (Mg)-HCO3 type to Ca-Cl (+NO3) or Ca (Mg)-Cl (+NO3), and Ca-Cl (+NO3+SO4) or Ca (Mg)-Cl (+NO3+SO4) type. Concentrations of NO 3 − , Cl−, SO 4 2− , Na+, and K+ generally show an indistinct grouping with respect to land use types, with very high concentrations observed in the groundwater from residential and agricultural areas. This suggests that those ions are mainly derived from sewage effluents and fertilizers. No specific land use control on the Mg2+ ion distribution is observed, suggesting Mg2+ is originated from natural dissolution of carbonate rocks. The distribution of Ca2+ and HCO 3 − does not show any distinct land use control either, except for the samples from residential zones, suggesting the Ca2+ and HCO 3 - mainly come from both natural dissolution of carbonate rocks and sewage effluents.
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- Effects of Land Use on Hydrochemistry and Contamination of Karst Groundwater from Nandong Underground River System, China
Water, Air, & Soil Pollution
Volume 210, Issue 1-4 , pp 123-141
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- Groundwater quality
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- Author Affiliations
- 1. School of Geographical Sciences, Southwest University, No.2 Tiansheng Ave., Beibei District, Chongqing, 400715, China
- 2. Institute of Karst Environment and Rock Desert Rehabilitation, Chongqing, 400715, China
- 3. Hoffman Environmental Research Institute, Western Kentucky University, USA, Bowling Green, KY, 42101, USA
- 4. Department of Geography and Geology, Western Kentucky University, USA, Bowling Green, KY, 42101, USA