Spatio-temporal Evolution Process and Its Evaluation Method of Karst Rocky Desertification in Guizhou Province
Received date: 2008-08-20
Revised date: 2008-12-28
Online 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
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
BAI Xiaoyong,WANG Shijie,CHEN Qiwei,CHENG Anyun,NI Xuebo . Spatio-temporal Evolution Process and Its Evaluation Method of Karst Rocky Desertification in Guizhou Province[J]. Acta Geographica Sinica, 2009 , 64(5) : 609 -618 . DOI: 10.11821/xb200905010
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