喀斯特森林群落退化对浅层岩溶地下水化学的影响

doi:10.11707/j.1001-7488.20070204

Scientia Silvae Sinicae ›› 2007, Vol. 43 ›› Issue (02): 21-25.doi: 10.11707/j.1001-7488.20070204

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Effects of Forest Community Degradation on Water Chemical of Karst Shallow Groundwater

Liu Fang^1,2,Wang Shijie¹,Luo Haibo²,Liu Yuansheng²,He Tengbing²,Long Jian³

1. National Laboratory of Environmental Geochemistry, Geochemistry Institute of Chinese Academy of Sciences Guiyang 550002; 2. Environment and Resource Institute of Guizhou University Guiyang 550025; 3. Geography Department of Guizhou Normal University Guiyang 550004

Received:2006-05-10 Revised:1900-01-01 Online:2007-02-25 Published:2007-02-25

Abstract

Abstract:

The effects of forest community degradation on chemical composition of Karst shallow groundwater were studied in Guizhou Province by investigating vegetations and analyzing the samples of runoff and Karst groundwater. The results showed that the order of concentrations of anion and cation in rainfall is SO₄^2->K⁺、Ca²⁺、HCO₃^->Na⁺、Mg²⁺、Cl^->NO₃^-、NH₄⁺>PO³₄^-,, while the order of concentrations of anion and cation in runoff is HCO₃^->SO₄^2-、Ca²⁺>Mg²⁺、Cl^->K⁺、Na⁺、NO₃^->NH₄⁺>PO³₄^-, and that the chemical composition of Karst shallow groundwater is similar with that of the runoff, but the concentrations of HCO^-₃, Ca²⁺ , Mg²⁺ and electric conductivity are higher than that of surface runoff. The results also showed that with increasing the grades of Karst forest community degradation, the percents of HCO^-₃, Ca²⁺ reduced significantly and the percent of SO^2-₄ enhanced obviously, and that the contents of HCO^-₃, Ca²⁺ , K⁺, NH⁺₄ in Karst shallow groundwater correlated significantly with the rate of forest coverage, which the content of HCO^-₃ is dominant factor to impact on electric conductivity of Karst groundwater, Ca²⁺ , K⁺ and Mg²⁺ coming next,so that electric conductivity could be used as primary indices to evaluate Karst forest community degradation impacting on ecological environment.

Key words: Karst, forest community, community degradation, Karst groundwater, water chemistry

Liu Fang;Wang Shijie;Luo Haibo;Liu Yuansheng;He Tengbing;Long Jian. Effects of Forest Community Degradation on Water Chemical of Karst Shallow Groundwater[J]. Scientia Silvae Sinicae, 2007, 43(02): 21-25.

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Effects of Forest Community Degradation on Water Chemical of Karst Shallow Groundwater

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