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首页> 外文期刊>Soil Science Society of America Journal >Diversity and Dynamics of Methanotrophs within an Experimental Landfill Cover Soil
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Diversity and Dynamics of Methanotrophs within an Experimental Landfill Cover Soil

机译：实验性垃圾掩埋土壤中甲烷营养菌的多样性和动力学

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Three experimental biocovers were installed during the summer of 2006 at the St-Nicephore landfill in Quebec (Canada). The main objectives of the experimental program were to assess the efficiency of these biocovers in reducing CH sub(4) emissions and to monitor the evolution in space and time of the dynamics and diversity of methanotrophic bacteria that may be responsible for CH sub(4) abatement. Dynamics of methanotroph populations derived from most probable number (MPN) counts exhibited different steps (lag, growth, and collapse phases), with mean abundances decreasing somewhat with depth. Methanotroph diversity, as assessed by denaturing gradient gel electrophoresis showed changes over time in the community structure. These changes were dependent on the sampling depth and only Type I methanotrophs belonging essentially to the genus Methylobacter were retrieved from our samples. Given the youthful character of the system under study, together with the reported behavior of this functional group of methanotrophs, it was concluded that Type I methanotrophs forming the community structure might reflect pioneer species with a potentially high growth rate (r-strategists) that become numerically dominant reducing the evenness of species distribution. These results contribute to the generally limited body of knowledge on methanotroph diversity in landfill cover soils.
机译：2006年夏季，在加拿大魁北克的St-Nicephore垃圾填埋场安装了三个实验性生物覆盖物。实验计划的主要目标是评估这些生物覆盖物在减少CH sub（4）排放中的效率，并监测可能造成CH sub（4）的甲烷营养细菌的动力学和多样性的时空演变。减排。从最可能数（MPN）计数得出的甲烷营养生物种群的动力学表现出不同的步长（滞后，生长和崩溃阶段），平均丰度随深度而有所降低。通过变性梯度凝胶电泳评估的甲烷营养菌多样性显示了群落结构随时间的变化。这些变化取决于采样深度，并且仅从我们的样品中检索出基本上属于甲基杆菌属的I型甲烷营养菌。鉴于所研究系统的年轻特征，以及该甲烷营养生物功能群的报道行为，得出的结论是，形成群落结构的I型甲烷营养生物可能反映了具有潜在高增长率的先驱物种（r策略家），在数值上占优势，降低了物种分布的均匀性。这些结果有助于在填埋场覆盖土壤中甲烷营养缺陷多样性方面的知识普遍有限。

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