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《Journal of Nanjing Forestry University》 2003-03
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Changes of Vegetation Features of Rocky Desertification Process in Karst Area of Guizhou

WANG Delu1,2,ZHU Shouqian2,HUANG Baolong1(1.Nanjing Forestry University,Nanjing 210037,China;2.Guizhou University,Guiyang 550025,China)  
Features of plants in the process of rocky desertification were studied.In this process,vegetation compositions varied greatly,with a degraded direction of tree to shrub,and species were replaced by more droughtresistant species with more drought degree increased.The tendency of degradation on vegetation was trees,treeshrubs,shrubs,shrubgrass or grassland and thin shrubgrass successively,while abundant species diversity were kept in a favorable climate.The community density increased firstly,then declined,and the height and coverage of community had decreased obviously with degradation of site to form a desertification landscape.The microhabitat severe degrees were increasing with the rock exposed degrees increasing,and the origins of vegetation were greatly affected by disturbances.The land productivity degradation was showed by the arbor tree degradation,which community biomass decreased rapidly,with a range of 41.134~0.206 t/hm2.During the degradation process,plants and site formed a positive feedback,with the same degraded direction,and the degradation process was characterized of asynchronous and nonlinearity on rate.The vegetation degradation was the important reason and sign of development of rocky desertification.
【Fund】: 贵州省自然科学基金资助项目((2001)3033);; 贵州省省长人才基金项目
【CateGory Index】: Q948
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