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首页> 外文期刊>Science of the total environment >Characterization of soil bacterial community structure and physicochemical properties in created and natural wetlands
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Characterization of soil bacterial community structure and physicochemical properties in created and natural wetlands

机译：人工湿地和天然湿地中土壤细菌群落结构和理化特性的表征

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We used multi-tag pyrosequencing of 16S ribosomal DNA to characterize bacterial communities of wetland soils collected from created and natural wetlands located in the Virginia piedmont. Soils were also evaluated for their physicochemical properties [i.e., percent moisture, pH, soil organic matter (SOM), total organic carbon (TOC), total nitrogen (TN), and C;N ratio]. Soil moisture varied from 15% up to 55% among the wetlands. Soil pH ranged between 4.2 and 5.8, showing the typical characteristic of acidic soils in the Piedmont region. Soil organic matter contents ranged from 3% up to 6%. Soil bacterial community structures and their differences between the wetlands were distinguished by pyrosequencing. Soil bacterial communities in the created wetlands were less dissimilar to each other than to those of either natural wetland, with little difference in diversity (Shannon's H') between created and natural wetlands, except one natural wetland consistently showing a lower H'. The greatest difference of bacterial community structure was observed between the two natural wetlands (R = 0.937, p<0.05), suggesting these two natural wetlands were actually quite different reflecting differences in their soil physicochemistry. The major phylogenic groups of all soils included Acidobacteria, Actinobacteria, Bactemidetes, Chloroflexi, Firmicutes, Cemmatinomadetes, Nitrospira, and Proteobacteria with Proteobacteria being the majority of the community composition. Acidobacteria group was more abundant in natural wetlands than in created wetlands. We found a significant association between bacterial community structures and physicochemical properties of soils such as C:N ratio (p = 0.43, p<0.01) and pH (p = 0.39, p< 0.01). The outcomes of the study show that the development of ecological functions, mostly mediated by microbial communities, is connected with the development of soil properties in created wetlands. Soil properties should be carefully monitored to examine the progress of functional wetland mitigation.
机译：我们使用16S核糖体DNA的多标签焦磷酸测序来表征从位于弗吉尼亚州皮埃蒙特的人工湿地和自然湿地收集的湿地土壤的细菌群落。还评估了土壤的理化特性[即，水分百分比，pH，土壤有机质（SOM），总有机碳（TOC），总氮（TN）和碳氮比]。在湿地中，土壤湿度从15％到55％不等。土壤pH值在4.2到5.8之间，显示了皮埃蒙特地区酸性土壤的典型特征。土壤有机质含量从3％到6％不等。通过焦磷酸测序来区分土壤细菌群落结构及其在湿地之间的差异。在人工湿地中，土壤细菌群落之间的差异不那么大，而在任何一个自然湿地中，除了人工湿地始终表现出较低的H'外，人工湿地与自然湿地之间的多样性差异（香农H'）几乎没有。在两个自然湿地之间观察到最大的细菌群落结构差异（R = 0.937，p <0.05），表明这两个自然湿地实际上是完全不同的，反映了它们的土壤理化差异。所有土壤的主要系统发生群包括嗜酸细菌，放线菌，拟杆菌，绿弯曲菌，硬毛菌，Cemmatinomadetes，Nitrospira和Proteobacteria，其中Proteobacteria是群落的主要组成部分。自然湿地中的酸性细菌群比人工湿地中的丰富。我们发现细菌群落结构与土壤的理化特性之间存在显着关联，例如C：N比（p = 0.43，p <0.01）和pH（p = 0.39，p <0.01）。研究结果表明，主要由微生物群落介导的生态功能的发展与人工湿地土壤特性的发展有关。应仔细监测土壤性质，以检查功能性湿地缓解的进度。

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