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首页> 外文期刊>Environmental Science & Technology >Iron-Mediated Anaerobic Oxidation of Methane in Brackish Coastal Sediments
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Iron-Mediated Anaerobic Oxidation of Methane in Brackish Coastal Sediments

机译：含铁的微咸海岸沉积物中甲烷的厌氧氧化

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摘要

Methane is a powerful greenhouse gas and its biological conversion in marine sediments, largely controlled by anaerobic oxidation of methane (AOM), is a crucial part of the global carbon cycle. However, little is known about the role of iron oxides as an oxidant for AOM. Here we provide the first field evidence for iron-dependent AOM in brackish coastal surface sediments and show that methane produced in Bothnian Sea sediments is oxidized in distinct zones of iron- and sulfate-dependent AOM. At our study site, anthropogenic eutrophication over recent decades has led to an upward migration of the sulxate/methane transition zone in the sediment Abundant iron oxides and high dissolved ferrous iron indicate iron reduction in the methanogenic sediments below the newly established sulfate/methane transition. Laboratory incubation studies of these sediments strongly suggest that the in situ microbial community is capable of linking methane oxidation to iron oxide reduction. Eutrophication of coastal environments may therefore create geochemical conditions favorable for iron-mediated AOM and thus increase the relevance of iron-dependent methane oxidation in the future. Besides its role in mitigating methane emissions, iron-dependent AOM strongly impacts sedimentary iron cycling and related biogeochemical processes through the reduction of large quantities of iron oxides.
机译：甲烷是一种强大的温室气体，其在海洋沉积物中的生物转化主要由甲烷的厌氧氧化（AOM）控制，是全球碳循环的重要组成部分。但是，关于铁氧化物作为AOM氧化剂的作用知之甚少。在这里，我们提供了咸淡的沿海表层沉积物中铁依赖的AOM的第一个现场证据，并显示了在波恩海沉积物中产生的甲烷在铁依赖和硫酸盐依赖的AOM的不同区域中被氧化。在我们的研究现场，近几十年来人为的富营养化导致了沉积物中硫酸盐/甲烷过渡带的向上迁移。大量的氧化铁和高溶解的亚铁表明新建立的硫酸盐/甲烷过渡带之下的产甲烷沉积物中的铁还原。这些沉积物的实验室温育研究强烈表明，原位微生物群落能够将甲烷氧化与氧化铁还原联系起来。因此，沿海环境的富营养化可能会创造有利于铁介导的AOM的地球化学条件，从而在将来增加铁依赖性甲烷氧化的相关性。依赖铁的AOM除了具有减少甲烷排放的作用外，还通过减少大量的氧化铁而强烈影响沉积铁的循环和相关的生物地球化学过程。

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  • 来源
    《Environmental Science & Technology》 |2015年第1期|277-283|共7页
  • 作者

    Matthias Egger; Olivia Rasigraf; Celia J. Sapart; Tom Jilbert; Mike S. M. Jetten; Thomas Roeckmann; Carina van der Veen; Narcisa Banda; Boran Kartal; Katharina F. Ettwig; Caroline P. Slomp;

  • 作者单位

    Department of Earth Sdences - Geochemistry, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;

    Department of Microbiology, Institute for Water and Wedand Research, Faculty of Science, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;

    Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands,Laboratoire de Glaciologie, Universite Libre de Bruxelles, 50 Avenue F. D. Roosevelt, B-1050 Bruxelles, Belgium;

    Department of Earth Sdences - Geochemistry, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands,Department of Environmental Sciences, University of Helsinki, Viikinkaari 2a, 00014 Helsinki, Finland;

    Department of Microbiology, Institute for Water and Wedand Research, Faculty of Science, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;

    Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands;

    Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands;

    Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands;

    Department of Microbiology, Institute for Water and Wedand Research, Faculty of Science, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands,Department of Biochemistry and Microbiology, Laboratory of Microbiology, Ghent University, K. L. Ledeganckstraat 35, 9000 Gent, Belgium;

    Department of Microbiology, Institute for Water and Wedand Research, Faculty of Science, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;

    Department of Earth Sdences - Geochemistry, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;

  • 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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