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Hydrogeochemistry and dissolved inorganic carbon isotopic composition on karst groundwater in Maolan, southwest China

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Abstract

The forest ecosystem in the Maolan karst forest, southwest China is the only concentrated, intact, and relatively stable karst forest ecosystem which has survived in the area at the same latitude in the world, and is a valuable karst forest plant resource as well. Groundwater samples from Maolan karst forest were collected from wells and springs during summer; and concentrations of major ions and dissolved inorganic carbon (DIC) isotopic compositions were measured. The pH values range from 7.2 to 8.3 results from the dissolution of carbonate, HCO3 − is the dominant species of DIC in groundwater. Calcium and HCO3 −, followed by Mg2+ and SO4 2− dominate the chemical composition of major ions in the groundwaters. Groundwater samples have δ13C values in the range from −8.1‰ to −16.6‰, which are lower than that of the other karst city groundwaters in the southwest China. Combining δ13CDIC ratios with measurements of HCO3 − and pH clearly distinguishes the principal processes underlying the geochemical evolution of groundwater in Carboniferous carbonate aquifers, where processes can be both degradation of organic matters in the soil and the carbonate dissolution.

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Acknowledgments

This study was supported jointly by the Innovation Program of Chinese Academy of Sciences (No. KZCX-YW-306) and Ministry of Science and Technology of China (Grant No. 2006CB403206) as well as the Chinese National Natural Science Foundation (Nos. 40673010, 40721002).

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Authors and Affiliations

  1. The State Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China

    Guilin Han, Yang Tang & Qixin Wu

  2. Graduate School of Chinese Academy of Sciences, Beijing, 100039, China

    Yang Tang & Qixin Wu

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  1. Guilin Han
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  2. Yang Tang
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  3. Qixin Wu
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Correspondence to Guilin Han.

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Han, G., Tang, Y. & Wu, Q. Hydrogeochemistry and dissolved inorganic carbon isotopic composition on karst groundwater in Maolan, southwest China. Environ Earth Sci 60, 893–899 (2010). https://doi.org/10.1007/s12665-009-0226-y

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