中文摘要：

为了探讨植被恢复对喀斯特土壤生化特性的影响,对云南石林景区植被恢复演替下土壤养分、微生物群落结构及活性进行了比较研究。结果表明,相对于裸露地,植被恢复显著地提高了土壤养分、微生物量碳、微生物活性、微生物商、细菌种丰富度及基因多样性;相对于对照原始林,植被恢复演替下土壤总有机碳、总氮、微生物量碳、基础呼吸和诱导呼吸的恢复程度分别为32%～83%、36%～70%、54%～89%、58%～82%和35%～51%;对照林与植被恢复演替下土壤细菌群落结构之间的相似性遵循如下趋势：裸露地〈（稀）草地〈灌丛。总体上,自然恢复方式（草地和灌丛）提高土壤质量效果优于人工恢复方式（柏树林）;从裸露地到稀草地恢复过程中,土壤质量提高尤为迅速,为退化喀斯特土壤生态系统进一步恢复改善了条件。

英文摘要：

The process and mechanism of soil quality change along vegetation succession in degraded karst regions has been the research focus of soil science and ecology in China for the last 10 years.Topsoil samples were collected from selected eco-tesserae along a vegetation succession in Stone Forest,Yunnan,China.Soil nutrient pools of organic carbon and total nitrogen and those parameters of biological activity such as microbial biomass carbon,BR,PR,and qCO2 increased and evidenced the changes in soil function for ecosystem health along the vegetation succession.Bacterial community structures measured by molecular method（PCR-DGGE）,as molecular footprint,traced sensitively soil quality and health changes caused by vegetation succession.These results demonstrated that,compared to bare land,vegetation restoration has not only enlarged soil nutrient pool,but also enhanced soil microbial biomass,diversity and activity,leading to a soil ecosystem with higher productivity and stability.In general,compared to cypress plantation,natural restoration（grassland and shrub）was an effective approach to improving soil quality indicated by soil biochemical properties.It was interesting that rate of soil quality recovery was faster at the early stage of vegetation restoring（thin grassland layer from bare land）,which meant good basal soil conditions built up for degraded karst ecosystem further restoration.