SU Guang-shi1,2，WANG Shi-jie2,HU Bao-qing3,YANGXiao-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) |
Abstract：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.
Key words：karst; Chengjiang small watershed; land use pattern; soil physical property; soil microbe
EARTH AND ENVIRONMENT Vol. 41, No.1, Tot No.291, 2013, Page 29-36
