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Sulfur-Driven Iron Reduction Coupled to Anaerobic Ammonium Oxidation

机译：硫驱铁还原与厌氧铵氧化

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摘要

A new biogeochemical pathway has been suggested to be present in terrestrial ecosystems, linking the nitrogen and iron cycles via ferric iron reduction coupled to anaerobic ammonium oxidation. However, the underlying microbiological process has not been demonstrated to date. Here we report a stable consortium, HJ-4, composed of Anacrospora hongkongensis (85%) and facultative anaerobe, Comamonadaceae (15%), which can process ferrihydrite reduction coupled to anaerobic ammonium oxidation driven by sulfur redox cycling. In this process, A hongkongensis reduces elemental sulfur, sulfite, and polysulfides to sulfide, which fuels ferrihydrite reduction. Sulfide, elemental sulfur, sulfite, and polysulfides serve as electron shuttles, completing the sulfur cycle between A. hongkongensis and ferrihydrite. In addition, Comamonadaceae shows ammonium oxidation potential under aerobic conditions, with nitrite as the main product We inferred that Comamonadaceae mediates simultaneous nitrification-denitrification coupled to iron redox cycling through nitrateitrite-dependent ferrous oxidation under anaerobic conditions. Hence, we discovered a novel pathway for ferric iron reduction coupled to ammonium oxidation, highlighting the key role of electron shuttles and nitrateitrite-dependent ferrous oxidation in this process. The biogeochemical cycling of sulfur, iron, and nitrogen could be coupled in aquatic and terrestrial ecosystems.
机译：有人提出一种新的生物地球化学途径存在于陆地生态系统中，通过三价铁还原和厌氧铵氧化将氮和铁循环联系起来。但是，迄今为止尚未证明潜在的微生物过程。在这里，我们报告了一个稳定的财团HJ-4，该财团由香港无翅目（Anacrospora hongkongensis）（85％）和兼性厌氧菌Comamonadaceae（15％）组成，可以处理亚铁酸盐还原反应，并通过硫氧化还原循环驱动厌氧铵氧化。在此过程中，香港香椿将元素硫，亚硫酸盐和多硫化物还原为硫化物，从而促进了亚铁水合物的还原。硫化物，元素硫，亚硫酸盐和多硫化物作为电子穿梭体，完成了A. hongkongensis和亚铁水合物之间的硫循环。此外，Comamonadaceae在需氧条件下显示出铵氧化的潜力，以亚硝酸盐为主要产物。我们推断Comamonadaceae在厌氧条件下通过硝酸盐/亚硝酸盐依赖性的亚铁氧化介导了同时的硝化-反硝化和铁氧化还原循环。因此，我们发现了一种新的还原铁的方法，将铁还原为铵盐，突出了电​​子穿梭和硝酸盐/亚硝酸盐依赖性的亚铁氧化的关键作用。硫，铁和氮的生物地球化学循环可以在水生和陆地生态系统中耦合。

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  • 来源
    《Environmental Science & Technology》 |2017年第12期|6691-6698|共8页
  • 作者

    Peng Bao; Guo-Xiang Li;

  • 作者单位

    Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, P. R. China,Key Lab of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo, 315800, China;

    Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, P. R. China,Key Lab of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo, 315800, China,University of Chinese Academy of Sciences, Beijing, 100049, China;

  • 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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