Acta Geographica Sinica ›› 2009, Vol. 64 ›› Issue (5): 609-618.doi: 10.11821/xb200905010

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Spatio-temporal Evolution Process and Its Evaluation Method of Karst Rocky Desertification in Guizhou Province

BAI Xiaoyong1,2,4, WANG Shijie2,3, CHEN Qiwei5, CHENG Anyun2,4, NI Xuebo2,4   

  1. 1. Institute of Mountain Hazards and Environment,CAS,Chengdu 610041,China;
    2. State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,CAS,Guiyang 550002,China;
    3. Puding Comprehensive Karst Research and Experimental Station,Institute of Geochemistry,CAS and Science and Technology Department of Guizhou Province,Puding 562100,Guizhou,China;
    4. Graduate School of Chinese Academy of Sciences,Beijing 100049,China;
    5. Guizhou Education Institute,Guiyang 550003,China
  • Received:2008-08-20 Revised:2008-12-28 Online:2009-05-25 Published:2009-05-25
  • Supported by:

    Basic Research Program of China, No.2006CB403200;Knowledge Innovation Program of the Chinese Academy of Sciences,No.KZCX2-YW-306; National Key Technology R&D Program,No.2006BAC01A09 and 2008BAD98B07

Abstract:

In this paper the spatial-temporal evolution processes of KRD land in Guizhou Province was analyzed mathematically by using 1:100000 scale digital-distribution maps of KRD land obtained by user-computer interactive interpreting method from Landsat images in 1986, 1995 and 2000. The following conclusions are obtained: (1) From 1986 to 2000, the change in total area of KRD land in Guizhou was not obvious, but the mutual transformation of different KRD types is extremely remarkable. (2) The change patterns of KRD land are divided into three kinds: simple change mode, continuous change mode and returned change mode, and characterized by continuous change mode. (3) The forward and reversion evolution processes coexist, with the ratio of the former to the latter being 82.29%, demonstrating that the situation is getting better partially and on the whole it is worsening. (4) The rate of the KRD evolution is 398.31 km2 per year, and the change rate of different type KRD land is inverse proportion to its degree of degradation. (5) The change frequencies of moderate and potential KRD land is highest and obviously higher than that of light KRD land. The regional characteristics of KRD spatial evolution and its influencing factors are analyzed, and some suggestions on comprehensive control of KRD land are put forward.

Key words: karst rocky desertification, spatial-temporal evolution, Guizho