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首页> 外文期刊>Permafrost and Periglacial Processes >Impact of Lake-Level and Climate Changes on Microbial Communities in a Terrestrial Permafrost Sequence of the El'gygytgyn Crater, Far East Russian Arctic
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Impact of Lake-Level and Climate Changes on Microbial Communities in a Terrestrial Permafrost Sequence of the El'gygytgyn Crater, Far East Russian Arctic

机译：俄罗斯远东北极地区El'gygytgyn火山口的多年冻土层中湖泊水位和气候变化对微生物群落的影响

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摘要

Microbial permafrost communities play an important role in carbon cycling and greenhouse gas fluxes. Despite the importance of these processes, there is a lack of knowledge about how environmental and climatic changes affect the abundance and composition of microorganisms. Here, we investigated the changing distribution of permafrost microorganisms in response to climate and lake-level changes. The permafrost core was drilled at the near shore of Lake El'gygytgyn, Far East Russian Arctic, and a combined microbiological and lipid biomarker approach was applied. The lower part of the permafrost core, deposited under subaquatic conditions, contains only small amounts of microbial signals; total organic carbon (TOC) content is sparse. After exposure of the site to subaerial conditions during the Aller0d, the abundance of Bacteria and Archaea started to increase and the lake-level change is especially evidenced by the relative proportion of archaeal biomarkers. This increase is supported by rising bacterial and archaeal 16S ribosomal ribonucleic acid (rRNA) gene copy numbers and significant amounts of TOC during the late Aller0d. After a small decrease during the colder Younger Dryas, the TOC content and the microbial signals strongly increase during the Holocene, presumably stimulated by pedogenesis. The occurrence of intact phospholipids indicates the presence of living microorganisms in these deposits. Our data suggest that methane formation is mainly expected for the subaerial interval, especially the Holocene where methanogens were identified by fingerprinting. This study emphasises the role of the uppermost permafrost deposits as a hotspot of carbon cycling in arctic environments, especially in the light of expected future global warming.
机译：微生物多年冻土群落在碳循环和温室气体通量中起重要作用。尽管这些过程很重要，但缺乏有关环境和气候变化如何影响微生物的丰度和组成的知识。在这里，我们调查了响应气候和湖泊水位变化的多年冻土微生物分布的变化。在俄罗斯远东北极地区的El'gygytgyn湖近岸钻了多年冻土岩心，并采用了微生物学和脂质生物标记相结合的方法。在水底条件下沉积的多年冻土岩心下部仅包含少量微生物信号。总有机碳（TOC）含量稀少。在Aller0d期间将该地点暴露于空中环境之后，细菌和古细菌的丰度开始增加，并且古细菌生物标志物的相对比例尤其证明了湖泊水位的变化。细菌和古细菌16S核糖体核糖核酸（rRNA）基因拷贝数增加以及在Aller0d晚期大量TOC支持了这一增加。在较冷的Younger Dryas中略有下降后，全新世期间TOC含量和微生物信号强烈增加，可能是由成岩作用刺激的。完整磷脂的出现表明在这些沉积物中存在活的微生物。我们的数据表明，甲烷形成主要是在大气层间隔期进行的，尤其是全新世，其中通过指纹识别发现了甲烷源。这项研究强调了北极地区最上部的多年冻土沉积物作为碳循环热点的作用，特别是考虑到预期的未来全球变暖。

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  • 来源
    《Permafrost and Periglacial Processes》 |2014年第2期|107-116|共10页
  • 作者

    Juliane Bischoff; Kai Mangelsdorf; Georg Schwamborn; Dirk Wagner;

  • 作者单位

    Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Potsdam, Germany,GFZ German Research Centre for Geosciences, Section 4.3 Organic Geochemistry, Telegrafenberg, Potsdam, Germany,School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, UK;

    GFZ German Research Centre for Geosciences, Section 4.3 Organic Geochemistry, Telegrafenberg, Potsdam, Germany;

    Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Potsdam, Germany;

    GFZ German Research Centre for Geosciences, Section 4.5 Geomicrobiology, C 425, Telegrafenberg, 14473 Potsdam, Germany;

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  • 正文语种 eng
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  • 关键词

    microorganism; microbial succession; lipid biomarkers; permafrost;

    机译：微生物;微生物演替脂质生物标志物;多年冻土;

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