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首页> 外文期刊>Environmental Science & Technology >Evidence of Nitrogen Loss from Anaerobic Ammonium Oxidation Coupled with Ferric Iron Reduction in an Intertidal Wetland
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Evidence of Nitrogen Loss from Anaerobic Ammonium Oxidation Coupled with Ferric Iron Reduction in an Intertidal Wetland

机译：潮间带湿地厌氧氨氧化与三价铁还原相结合导致氮损失的证据

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摘要

Anaerobic ammonium oxidation coupled with nitrite reduction is an important microbial pathway of nitrogen removal in intertidal wetlands. However, little is known about the role of anaerobic ammonium oxidation coupled with ferric iron reduction (termed Feammox) in intertidal nitrogen cycling. In this study, sediment slurry incubation experiments were combined with an isotope-tracing technique to examine the dynamics of Feammox and its association with tidal fluctuations in the intertidal wetland of the Yangtze Estuary. Feammox was detected in the intertidal wetland sediments, with potential rates of 0.24-0.36 mg N kg~(-1) d~(-1). The Feammox rates in the sediments were generally higher during spring tides than during neap tides. The tidal fluctuations affected the growth of iron-reducing bacteria and reduction of ferric iron, which mediated Feammox activity and the associated nitrogen loss from intertidal wetlands to the atmosphere. An estimated loss of 11.5-18 t N km~(-2) year~(-1) was linked to Feammox, accounting for approximately 3.1-4.9% of the total external inorganic nitrogen transported into the Yangtze Estuary wetland each year. Overall, the co-occurrence of ferric iron reduction and ammonium oxidation suggests that Feammox can act as an ammonium removal mechanism in intertidal wetlands.
机译：厌氧铵氧化结合亚硝酸盐还原是潮间带湿地脱氮的重要微生物途径。然而，关于潮间氮循环中厌氧铵氧化与三价铁还原反应（称为Feammox）的作用了解甚少。在这项研究中，沉积物泥浆培养实验与同位素示踪技术相结合，以研究Feammox的动力学及其与长江口潮间带湿地潮汐波动的关系。在潮间带湿地沉积物中检测到Feammox，潜在速率为0.24-0.36 mg N kg〜（-1）d〜（-1）。春季潮汐中的沉积物中Feammox率通常高于潮汐时。潮汐波动影响了还原铁细菌的生长和三价铁的还原，这介导了Feammox活性以及相关的氮从潮间带湿地流向大气。 Feammox造成的估计损失为11.5-18 t N km〜（-2）年〜（-1），约占每年运入长江口湿地的外部无机氮总量的3.1-4.9％。总体而言，三价铁还原和铵氧化的共同出现表明，Feammox可以作为潮间带湿地中的铵去除机制。

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  • 来源
    《Environmental Science & Technology》 |2015年第19期|11560-11568|共9页
  • 作者

    Xiaofei Li; Lijun Hou; Min Liu; Yarding Zheng; Guoyu Yin; Xianbiao Lin; Lv Cheng; Ye Li; Xiaoting Hu;

  • 作者单位

    College of Geographical Sciences, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    College of Geographical Sciences, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    College of Geographical Sciences, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    College of Geographical Sciences, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    College of Geographical Sciences, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China;

    College of Geographical Sciences, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, 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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