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Article

Seasonal Differences in the Hydrochemical Characteristics of Karst Wetlands and the Associated Mechanisms in Huixian, China

by 1,2, 1,2,3,*, 1,2, 1,2 and 1,2
1
Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
2
International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Guilin 541004, China
3
Chengdu Center, China Geological Survey, Chengdu 610081, China
*
Author to whom correspondence should be addressed.
Academic Editor: Maurizio Barbieri
Water 2022, 14(15), 2362; https://doi.org/10.3390/w14152362
Received: 16 June 2022 / Revised: 26 July 2022 / Accepted: 28 July 2022 / Published: 30 July 2022
(This article belongs to the Section Hydrology)
The present study aimed to identify the seasonal changes in the hydrochemical characteristics of the Huixian karst wetland and the underlying mechanism. Conventional ions and isotopes of 130 groundwater samples collected during the wet and dry seasons were analyzed. The hydrochemical characteristics of groundwater in the Huixian karst wetland were clarified using mathematical statistics and hydrochemical methods, including Durov diagrams, ionic ratios, Gibbs diagrams, and H and O isotopes. The hydrochemical evolution and sources of major ions in the Huixian karst wetland were also investigated. The results showed that cations and anions in groundwater in the study area were dominated by Ca2+ and HCO3, respectively, sourced mainly from calcite weathering. The ions of some groundwater samples were regulated by weathering of dolomite, dolomitic limestone, and pyrite, resulting in relatively high concentrations of Mg2+ and SO42−. K+, Na+, SO42−, NO3, and Cl in groundwater originated from precipitation, Na+ and Cl originated from domestic sewage, K+ was related to the application of potassium fertilizer in agriculture, and NO3 mainly originated from chemical fertilizer. Groundwater ions were primarily controlled by rock weathering, followed by evaporative concentration. The sources of major ions were dependent on the dissolution and precipitation of carbonate rock, as well as the chemical weathering of silicate rock and evaporite. Samples from the various water sources were scattered on both sides of the local meteoric water line (δD = 3.13δ18O − 13.9), which indicated isotopic composition was affected by evaporation and precipitation. View Full-Text
Keywords: stable isotope; hydrochemical characteristics; hydrochemical evolution; Huixian karst wetland stable isotope; hydrochemical characteristics; hydrochemical evolution; Huixian karst wetland
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MDPI and ACS Style

Ba, J.; Dan, Y.; Luo, F.; Tang, C.; Peng, C. Seasonal Differences in the Hydrochemical Characteristics of Karst Wetlands and the Associated Mechanisms in Huixian, China. Water 2022, 14, 2362. https://doi.org/10.3390/w14152362

AMA Style

Ba J, Dan Y, Luo F, Tang C, Peng C. Seasonal Differences in the Hydrochemical Characteristics of Karst Wetlands and the Associated Mechanisms in Huixian, China. Water. 2022; 14(15):2362. https://doi.org/10.3390/w14152362

Chicago/Turabian Style

Ba, Junjie, Yong Dan, Fei Luo, Chunlei Tang, and Cong Peng. 2022. "Seasonal Differences in the Hydrochemical Characteristics of Karst Wetlands and the Associated Mechanisms in Huixian, China" Water 14, no. 15: 2362. https://doi.org/10.3390/w14152362

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