Anxing Lai , Shiming Fan , Jingya Xue , Hongwei Wang , Ke Xie , Huabing Li , Hai Xu , Biao Li , Qinglong L. Wu
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引用次数: 0
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.
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.