Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 232-239.doi: 10.13278/j.cnki.jjuese.201501205

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Cause and Change Trend of Water Chemistry of Epikarst System Under the Vegetation Restoration:A Case of Landiantang Epikarst Spring, Nongla, Mashan, Guangxi

Kang Zhiqiang1,2,3, He Shiyi1,3, Luo Yunyi2   

  1. 1. Karst Dynamics Laboratory, MLR and GZAR, Guilin 541004, Guangxi, China;
    2. Guangxi Geology Survey, Nanning 530023, China;
    3. International Research Centre on Karst, UNESCO, Guilin 541004, Guangxi, China
  • Received:2014-05-01 Published:2015-01-26

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Abstract:

Limestone and dolomite are common carbonate rocks. Because of their different karstification mechanism, the different landscape would be formed. In Southwest of China, dolomite locates on the different classes of karst basis level of erosion, while the pure limestone locates at upper the mountain. So, the epikarst zone has a duality structure because of the special strata combination. Based on the mornitoring to discharge and hydrochemistry of Landiantang epikarst spring, Nongla, Guangxi, it is found that the hydrochemical type of most water samples is HCO3-Ca·Mg. The variation trend of the Ca2+ and Mg2+ is not very clear in seasonal timescale. But it is more sensitive to short-term precipitation dilution and CO2 effect of forest vegetation."Equivaleng dissolution line"(EDL) is defined by the relationship between concentration of Ca2+ and Mg2+. In this paper, EDL can be used to distinguish the causes of the differences of spring hydrochemistry under different precipitation conditions. In addition, based on the analysis on nearly ten years data of the hydrochemistry and discharge data of Landiantang epikarst spring, it is shown that spring discharge and major ions concentration in karst water are all increased under the situation of vegetation restoration. All of above is further evidence of the vegetation effect in karst process.

Key words: epikarst zone, cause of water chemistry, equivaleng dissolution line, karstification intensity, Nongla, Mashan, Guangxi

CLC Number: 

  • P641.134

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