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《Earth and Environment》 2013-01
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The Impact of Different Land Use Patterns on Soil Physical Properties and Microbes in Karst Small Watershed——A Case Study of Chengjiang Small Watershed in Du'an County,Guangxi

SU Guang-shi1,2,WANG Shi-jie2,HU Bao-qing3,YANG Xiao-qing3(1.Trade and Economics Department,Guangxi Economic Management Cadre College,Nanning 530007,China; 2 State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,CAS,Guiyang 550002,China; 3.School of Resources and Environmental Science,Guangxi Teachers Education University,Nanning 530001,China)  
Taking the Chengjiang small watershed in Duran County,Guangxi,as the research unit,we analyzed the impact of different land use patterns on soil physical properties and soil microbes in the watershed.The results indicated that the soil bulk density and pH showed an ascendant trend and the soil moisture content,soil porosity and electric conductivity decreased gradually with the land use pattern transforming from natural forest to shrub,shrub-grassland,herbosa,plantation,abandoned cropland and dry land.Among various land use patterns,the bacteria number was maximum and made up to 85%,while the actinomycetes and fungi were relatively low.From the view of total amount,the largest amount of soil microbes appeared in shrub-grassland and herbosa,while the natural forest land,shrub,dry land take the second place and abandoned cropland,plantation soil are least.The diversity index of soil microbes was relatively high in natural forest and plantation soil,while the shrub-grassland,herbosa,shrub,abandoned cropland ranks the second and dry land is lowest.
【Fund】: 广西自然科学基金项目“基于SOTER数据库的喀斯特石漠化过程、机理与综合治理模式研究(2010GXNSFA013006)”;; 广西教育厅科研项目(200911MS262)
【CateGory Index】: X820.3
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