退化喀斯特植被恢复对土壤微生物数量及群落功能多样性的影响  

Effects of Degraded Karst Vegetation Restoration on Soil Microbial Amount and Functional Diversity

作　　者：魏媛[1,2] 张金池[3] 俞元春[3] 喻理飞[2] 

机构地区：[1]贵州财经学院资源与环境管理学院,贵阳550004 [2]贵州大学林学院,贵阳550025 [3]南京林业大学森林资源与环境学院,南京210037

出　　处：《土壤》2010年第2期230-235,共6页Soils

基　　金：国家重点基础研究发展规划项目(973)(2006CB403206);国家“十一五”科技支撑计划项目(2006BAC01A09,2006BAD03A1006);国家自然科学基金项目(30872076);贵州省科学技术基金(黔科合J字[2009]2280号)项目资助

摘　　要：采集不同恢复阶段的土壤样品,采用微生物培养法研究了退化喀斯特植被恢复对土壤微生物数量、群落功能多样性的影响。研究结果表明随着退化喀斯特植被的恢复,土壤微生物数量增加,表现为乔木群落阶段>灌木群落阶段>草本群落阶段>裸地阶段。土壤微生物群落代谢功能分析表明:植被恢复往往导致较高的平均颜色变化率、物种丰富度和功能多样性。乔木群落阶段的平均诱导底物利用率最高,明显地与其他3个恢复阶段不同。总之,植被恢复使得土壤微生物数量增加,碳源平均利用率增强。因此,创造了更好的土壤条件更有利于退化喀斯特植被的恢复。Soil samples were collected at different restoration stages in a study area. By using microbial incubation methods the effects of vegetation restoration of degraded karst on soil microbial amount and community functional diversity were studied. The results showed the amount of soil microbes increased with vegetation restoration in an order of arboreal community stage〉shrubby community stage〉herbaceous community stage〉bare land stage. Themetabolic functional diversity of soil microbial community analyses indicated that vegetation restoration tended to result in higher average well color development, substrate richness and functional diversity. Average utilization of specific substrate guilds was highest in arboreal community stage. Arboreal community stage was significantly different fi＇om other three recovery stages. In conclusion, vegetation restoration improved the amount of soil microbes and utilization of carbon sources, thus created better soil conditions, which in turn were more conducive to vegetation restoration of degraded karst.

关 键 词：退化喀斯特植被 恢复序列 土壤微生物数量 群落代谢功能多样性 

分 类 号：Q938.1[生物学—微生物学] S154.37[农业科学—土壤学]