Denitrification and Anammox and Feammox in the Yinchuan Yellow River wetland

Qingsong Guan, Yiqiao Zhou, Shuo Li, Fan Yang and Rentao Liu
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Qingsong Guan: Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China; Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems in Northwestern China of Ministry of Education, Ningxia University, Yinchuan, P.R. China
Yiqiao Zhou: College of Application of Engineering, Henan University of Science and Technology, Sanmenxia, P.R. China
Shuo Li: College of Application of Engineering, Henan University of Science and Technology, Sanmenxia, P.R. China
Fan Yang: College of Application of Engineering, Henan University of Science and Technology, Sanmenxia, P.R. China
Rentao Liu: Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China; Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems in Northwestern China of Ministry of Education, Ningxia University, Yinchuan, P.R. China

Plant, Soil and Environment, 2024, vol. 70, issue 11, 731-738

Abstract: Denitrification, anaerobic ammonium oxidation (Anammox), and ferric iron reduction coupled with anaerobic ammonium oxidation (Feammox) are the nitrogen removal pathways in natural ecosystems. In this study, the differences between these three nitrogen removal pathways in a Phragmites australis covered site (LW), artificial grassland covered site (CD), poplar covered site (YD), and topsoil tillage after harvesting reed site (GD) in the Yinchuan Yellow River wetland were investigated using isotope tracing, metagenome, and quantitative polymerase chain reaction (Q-PCR) techniques. No 30N2 accumulation was detected in 15NH4+ addition incubations, indicating that Feammox was weak in all sites, which is consistent with a low abundance of the Feammox functional bacteria Acidimiprobiaceae sp. A6. The denitrification rates were 0.36 (LW), 0.5 (CD), 0.76 (YD) and 0.12 (GD) mg N/kg/day. The Anammox rates were 0.18 (LW) and 0.26 (GD) mg N/kg/day; other sites did not detect Anammox rate. Denitrification was the dominant pathway except for the CD site. The YD site had the highest abundance of denitrification genes, which was consistent with the denitrification rate.

Keywords: nitrogen cycling; environmental microorganism; functional gene; iron-nitrogen coupling; biogeochemistry (search for similar items in EconPapers)
Date: 2024
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DOI: 10.17221/318/2024-PSE

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