RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2010, Vol. 19 >> Issue (7): 797-.

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RESPONSE OF DISSOLVED ORGANIC CARBON IN SOIL WATER TO THE VEGETATION DEGRADATION IN KARST AREAS

XAO Dean1,2,3, WANG Shijie1,2,RONG Li2,4, LIU Fang2,5, RAN Jingcheng6, LIU Wei1,2,3, CHENG Anyun1,2
    

  1. (1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry,Chinese Academy of Sciences, Guiyang 550002, China|2. Experiment and Research Station of Karst Ecology and Rocky Desertification, Chinese Academy of Sciences, Puding 562100,  China;3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China|4. School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001|5. Institute of Environment and Resource, Guizhou University, Guiyang 550025, China|6. Management Bureau, Maolan National Nature Reserve, Libo 558400, China)
  • Online:2010-07-20

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Abstract:

The authors choose four sample plots with different vegetation types in Maolan karst areas according to their degradation degree,namely the virgin arborforests,secondary arborshrub mixed forests,shrubs and shrubgrassland,and then concentrations of dissolved organic carbon (DOC) in soil water at four sample plots were sampled monthly for one year and analyzed,respectively.The results indicate that:(1)DOC concentrations are higher in warm and wet seasons than those of cool and dry seasons in one year,which increase to maximum at June and then decrease.(2)DOC concentrations show a significant dependence on rainfalls.(3)DOC concentrations increase with vegetation degradation degree,and are higher in a degraded ecosystem than those of a nondegraded ecosystem,indicating that a virgin soilvegetation system is stable with less runoff and more storage and is not easily interrupted from outside disturbs.These results indicate that DOC values could be served as an effective indicator for vegetation degradation.

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