喀斯特小流域不同土地利用方式对土壤物理性状和微生物的影响——以广西都安澄江小流域为例  

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

作　　者：苏广实[1,2] 王世杰[2] 胡宝清[3] 杨小青[3] 

机构地区：[1]广西经济管理干部学院贸易经济系,南宁530007 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [3]广西师范学院资源与环境科学学院,南宁530007

出　　处：《地球与环境》2013年第1期29-36,共8页Earth and Environment

基　　金：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)

摘　　要：以广西都安澄江喀斯特小流域为研究单元,分析了不同土地利用方式对土壤表层物理性质和微生物的影响。结果表明:随着自然林地向灌丛地、灌草丛地、草地、人工林地、退耕地和旱地的转变,土壤容重、pH呈增加趋势,而土壤含水量、总孔隙度、电导率逐渐降低。各土地利用方式中,细菌数量最多,均占85%以上,放线菌和真菌相对较少。从总量上看,灌草丛地和草地土壤微生物总量最大,自然林地、灌丛地和旱地次之,退耕地和人工林地最小。各土地利用类型中自然林地和人工林地的土壤微生物多样性指数较高,灌草丛地、草地、灌丛地和退耕地次之,旱地最低。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.

关 键 词：喀斯特 澄江小流域 土地利用方式 土壤物理性质 土壤微生物 

分 类 号：S152[农业科学—土壤学] S154[农业科学—农业基础科学]