中文摘要：

选取了图们江下游典型沼泽、河流与湖泊湿地，以优势植被群落下土壤为研究对象，采用磷脂脂肪酸法测定了土壤微生物群落结构。结果表明：湖泊湿地中3种植被群落下土壤革兰氏阳性菌、细菌、真菌、放线菌含量差异显著，沼泽湿地与河流湿地中土壤真菌和放线菌含量无显著差异，其他微生物类群则表现出不同的变化特征。研究区湿地土壤细菌占总PLFA含量的90％以上，而放线菌占2％-4％，真菌占1％-7％。通过对9种植被群落下土壤微生物群落进行聚类分析，距离5-10与10-15时，分别将种植被群落下土壤微生物分为4组与6组，表明同种类型湿地下的微生物群落也会出现较大差异。

英文摘要：

Based on the method of phospholipid fatty acid, we measured the soil microbial community structure under dominant vegetation community of typical marsh, riverine and lacustrine in the downstream of the Tumen River. The results showed that the contents of soil gram positive bacteria, bacteria, fungi and actinomycetes were significantly different in three plant communities of lacustrine, and the contents of soil fungi and actinomycetes were no significant difference in the marsh and riverine wetlands, the other microbial taxa showed different characteristics. The soil bacteria accounted for more than 90% of total PLFA content in this area, while actinomycetes accounted for 2-4%, fungi accounted for 1 - 7%. By the method of cluster analysis of soil microbial communities in nine plant communities, when the distance is between 5 and 10,they were divided into six groups, and when the distance is between 10 and 15, they were divided into four groups, so it showed that the microbial community was different in the same type of wetland.