中文摘要：

异国情调的植物， Eupatorium adenophorum，越过西南中国很快入侵了，损坏本国的生态系统并且引起大经济损失。作为地下的社区的一个重要部件，土壤微生物能驾驶营养素骑车并且在陆上的生态系统调整植物竞争。因此，微生物引起的社区和功能将提高我们理解异国情调的植物的机制的土壤的知识在自然生态系统的侵略过程。在这研究，我们检验了土壤沿着 E 的一个侵略坡度的微生物引起的社区，土壤酶活动，土壤性质和植物社区。用西南中国人的 adenophorum 第二等的森林。土壤分析证明重侵略显著地增加了全部的 P 和没有 3 个 -N 内容，而它显著地减少了全部的 N 和土壤有机物内容。可得到的 P 内容被中等侵略显著地减少。E。adenophorum 侵略显著地减少了全部的土壤微生物的生物资源，以及克否定的细菌，放射菌类， arbuscular mycorrhizal (AM ) 真菌和非 AM 真菌。然而， E。adenophorum 侵略显著地增加了土壤 urease，酸磷酸酶，多酚 oxidase 和 peroxidase 的活动。非公制的多维的可伸缩显示出微生物引起的作文和土壤酶作文是的那土壤在三 E 显著地不同。adenophorum 入侵了地点。部分壁炉架测试显示植物作文是为组织微生物引起的土壤和酶作文的最重要的因素。结果建议那在土壤改变微生物引起的社区结构，酶活动可以在 E 的过程起一个重要作用。在一个中国第二等的森林生态系统的 adenophorum 侵略。

英文摘要：

The exotic plant, Eupatorium adenophorum, has invaded rapidly across southwest China, damaging native ecosystems and caus- ing great economic losses. Soil microbes, as an important component of belowground community, can drive nutrient cycling and regulate plant competition in terrestrial ecosystems. Therefore, knowledge of the soil microbial community and function will en- hance our understanding of the mechanism of exotic plant invasive process in natural ecosystems. In this study, we examined the soil microbial community, soil enzyme activity, soil property and plant community along an invasive gradient of E. adenophorum in a southwest Chinese secondary forest. The soil analysis demonstrated that heavy invasion significantly increased the total P and NO3-N contents, whereas it significantly decreased the total N and soil organic matter contents. The available P content was sig- nificantly decreased by moderate invasion. The E. adenophorum invasion significantly decreased the biomass of total soil mi- crobes, as well as Gram-negative bacteria, actinomycetes, arbuscular mycorrhizal （AM） fungi and non-AM fungi. However, E. adenophorum invasion significantly increased the activities of soil urease, acid phosphatase, polyphenol oxidase and peroxidase. Non-metric multidimensional scaling showed that soil microbial composition and soil enzyme composition were significantly different in the three E. adenophorum invaded sites. Partial Mantel tests indicated that plant composition was the most important factor for structuring soil microbial and enzyme compositions. The results suggest that changes in soil microbial community structure and enzyme activity may play an important role in the process of E. adenophorum invasion in a Chinese secondary for- est ecosystem.