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Methane dynamics regulated by microbial community response to permafrost thaw

机译：微生物群落对多年冻土融化的响应调节甲烷的动力学

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Permafrost contains about 50% of the global soil carbon. It is thought that the thawing of permafrost can lead to a loss of soil carbon in the form of methane and carbon dioxide emissions. The msgnitude of the resulting positive climate feedback of such greenhouse gas emissions is still unknown and may to a large extent depend on the poorly understood role of microbial community composition in regulating the metabolic processes that drive such ecosystem-scale greenhouse gas fluxes. Here we show that changes in vegetation and increasing methane emissions with permafrost thaw are associated with a switch from hydrogenotrophic to partly acetodastic methanogenesis, resulting in a large shift in the δ~(13)C signature (10-15‰) of emitted methane. We used a natural landscape gradient of permafrost thaw in northern Sweden as a model to investigate the role of microbial communities in regulating methane cycling, and to test whether a knowledge of community dynamics could improve predictions of carbon emissions under loss of permafrost. Abundance of the methanogen Candidatus 'Methanoflorens stordalenmirensis' is a key predictor of the shifts in methane isotopes, which in turn predicts the proportions of carbon emitted as methane and as carbon dioxide, an important factor for simulating the climate feedback associated with permafrost thaw in global models. By showing that the abundance of key microbial lineages can be used to predict atmospherically relevant patterns in methane isotopes and the proportion of carbon metabolized to methane during permafrost thaw, we establish a basis for scaling changing microbial communities to ecosystem isotope dynamics. Our findings indicate that microbial ecology may be important in ecosystem-scale responses to global change.
机译：多年冻土约占全球土壤碳的50％。人们认为，永久冻土的融化会导致甲烷和二氧化碳排放形式的土壤碳流失。这种温室气体排放所产生的积极的气候反馈的幅值仍然未知，并且在很大程度上可能取决于人们对微生物群落组成在调节驱动这种生态系统规模的温室气体通量的代谢过程中的作用了解甚少。在这里，我们表明，随着多年冻土融化，植被的变化和甲烷排放量的增加与从氢营养型向部分乙酸钾型甲烷生成的转换有关，导致排放的甲烷的δ〜（13）C特征（10-15‰）发生了较大变化。我们使用瑞典北部多年冻土融化的自然景观梯度作为模型，研究微生物群落在调节甲烷循环中的作用，并检验群落动态知识是否可以改善在永久冻土损失下碳排放的预测。产甲烷假丝酵母“ Methanoflorens stordalenmirensis”的丰度是甲烷同位素变化的关键预测因子，而甲烷同位素又预测了甲烷和二氧化碳排放的碳比例，这是模拟全球多年冻土融化相关的气候反馈的重要因素楷模。通过证明丰富的关键微生物谱系可用于预测甲烷同位素在大气中的相关模式以及多年冻土融化过程中代谢为甲烷的碳的比例，我们建立了根据生态系统同位素动态改变微生物群落规模的基础。我们的发现表明，微生物生态学可能在生态系统规模对全球变化的响应中很重要。

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  • 来源
    《Nature》 |2014年第7523期|478-481|共4页
  • 作者

    Carmody K. McCalley; Ben J. Woodcroft; Suzanne B. Hodgkins; Richard A. Wehr; Eun-Hae Kim; Rhiannon Mondav; Patrick M. Crill; Jeffrey P. Chanton; Virginia I. Rich; Gene W. Tyson; Scott R. Saleska;

  • 作者单位

    Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA,Earth Systems Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA (C.K.M.) Department of Ecology and Genetics, Uppsala University, Uppsala 75 236, Sweden (R.M.);

    Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Queensland, Australia;

    Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, USA;

    Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA;

    Department of Soil, Water and Environmental Science, University of Arizona, Tucson, Arizona 85721, USA;

    Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Queensland, Australia,Earth Systems Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA (C.K.M.) Department of Ecology and Genetics, Uppsala University, Uppsala 75 236, Sweden (R.M.);

    Department of Geological Sciences, Stockholm University, Stockholm 10691, Sweden;

    Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, USA;

    Department of Soil, Water and Environmental Science, University of Arizona, Tucson, Arizona 85721, USA;

    Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Queensland, Australia;

    Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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