Ammonium removal through anaerobic ammonium oxidation coupled to iron(III) reduction along the Yangtze river–estuary continuum

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-05-13 DOI:10.1016/j.jes.2024.05.006
Anxing Lai , Shiming Fan , Jingya Xue , Hongwei Wang , Ke Xie , Huabing Li , Hai Xu , Biao Li , Qinglong L. Wu
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Abstract

Anaerobic ammonium oxidation coupled to iron(III) reduction (Feammox) process has recently been recognized as an important pathway for removing ammonium in various natural habitats. However, our understanding for Feammox in river–estuary continuum is limited. In this study, stable isotope tracers and high-throughput amplicon sequencing were employed to determine Feammox rates and identify associated microbial communities in sediments along the Yangtze river–estuary continuum. Feammox rates averaged 0.0058 ± 0.0069 mg N/(kg·d) and accounted for approximately 22.3% of the ammonium removed from the sediments. Sediment Fe(III), ammonium (NH4+), total organic carbon (TOC), and pH were identified as important factors influencing Feammox rates. Additionally, Spirochaeta, Caldilineaceae_uncultured, and Ignavibacterium were found potentially associated with Feammox, which had not been documented as Feammox-associated microbial taxa previously. This study demonstrates that Feammox plays a vital role in ammonium removal within the Yangtze river–estuary continuum, providing greater insight into nitrogen removal and cycling in aquatic ecosystems.

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通过厌氧氨氧化与铁(III)还原作用去除长江-河口连续体中的氨氮
厌氧氨氧化与铁(III)还原(Feammox)过程最近被认为是各种自然生境中去除氨的重要途径。然而,我们对河流-河口连续体中 Feammox 过程的了解还很有限。本研究采用稳定同位素示踪剂和高通量扩增子测序技术来测定长江-河口连续沉积物中的Feammox速率并识别相关微生物群落。铁氧率平均为 0.0058 ± 0.0069 mg N/(kg-d),约占沉积物中氨去除量的 22.3%。沉积物中的铁(III)、铵(NH4+)、总有机碳(TOC)和 pH 值被认为是影响 Feammox 氧化率的重要因素。此外,研究还发现 Spirochaeta、Caldilineaceae_uncultured 和 Ignavibacterium 可能与 Feammox 相关,而这些微生物类群以前从未作为与 Feammox 相关的微生物类群被记录在案。这项研究表明,Feammox 在长江-河口连续水域的氨去除过程中发挥了重要作用,为水生生态系统的氮去除和循环提供了更深入的见解。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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