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| Landscape pattern variation and its ecological effects of karst area |
| Li Yangbing1,Tan Qiu2,Bai Xiaoyong1,Wang Shijie2 |
| 1.College of Geography and Biology Science,Guizhou Normal University,550001;2.National Key Laboratory of Environmental Geochemistry,Geochemistry Institute of CAS,550002: Guiyang,China |
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Abstract Based on 1995a and 2000a TM images,the landscape pattern and it's dynamic variation from 1995 to 2000 on the plateau-hilly region in middle of Guizhou were analyzed in order to understand the change processes of landscapes and corresponding ecological effects.The results indicate that shrub land,sloping farmland and mid-coverage barren grassland hold a dominant status.The transform relation among dry farmland,forest land and barren grassland is complicated also."Removal lands from cultivation for afforestation and grassplanting" and "damage forest and grass lands and reclamation",and vegetation restoration and degradation all exist at the same time.The whole landscapes have been in a fluctuating state still.The relative ecological value of different land use types have been fallen from 1995 to 2000 in studied area.The characteristics of landscape pattern are the result influenced by lithology,physiognomy and artificial activities together,and controlled by human activities mainly,for example,the variation of cultivated land are due to the conversion into construct land in this area.The change processes of land use patterns may behave as ecological restoration and degradation in studied area from 1995 to 2000.
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Received: 24 November 2005
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