4.7 Article

Anaerobic ammonium oxidation coupled to ferric iron reduction in the sediment of a eutrophic lake

Journal

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 15, Pages 15084-15094

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-04907-7

Keywords

Eutrophic lake; Ammonium oxidation; Feammox; Iron-reducing bacteria; Nitrogen loss; Sediments

Funding

  1. National Natural Science Foundation of China [51609234]
  2. Natural Science Foundation of Jiangsu Province [BK20161089]

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Anaerobic ammonium oxidation coupled to ferric iron reduction (Feammox) has been assumed to play an important role in nitrogen removal from ecosystems. This study assessed the potential role of Feammox in nitrogen transformation in eutrophic lake sediment using an isotope tracing technique in sediment slurry incubation experiments. Feammox was discovered in eutrophic lake sediment. A significant correlation was found between Feammox rates and iron-reducing rates. Furthermore, the positive correlations between the abundance of iron-reducing bacteria (FeRB), such as Geobacteraceae spp. and Shewanella spp., and Feammox rates indicate that Feammox was mediated by FeRB. The potential rate of Feammox in the isotopic tracer incubation treatment was 0.23-0.43 mg N kg(-1) day(-1). The estimated nitrogen loss caused by Feammox accounts for 5.0-9.2% of the human-induced N input annually into the eutrophic lake. Feammox alone or coupled with anaerobic ammonium oxidation (anammox) and/or denitrification may have an essential role in the nitrogen cycle within eutrophic lake sediment.

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