Asynchronous characteristics of Feammox and iron reduction from paddy soils in Southern China.
Environ Res
; 252(Pt 1): 118843, 2024 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-38582429
ABSTRACT
Recently, the newly discovered anaerobic ammonium oxidation coupled with iron reduction (i.e., Feammox) has been proven to be a widespread nitrogen (N) loss pathway in ecosystems and has an essential contribution to gaseous N loss in paddy soil. However, the mechanism of iron-nitrogen coupling transformation and the role of iron-reducing bacteria (IRB) in Feammox were poorly understood. This study investigated the Feammox and iron reduction changes and microbial community evolution in a long-term anaerobic incubation by 15N isotope labeling combined with molecular biological techniques. The average rates of Feammox and iron reduction during the whole incubation were 0.25 ± 0.04 µg N g-1 d-1 and 40.58 ± 3.28 µg Fe g-1 d-1, respectively. High iron oxide content increased the Feammox rate, but decreased the proportion of Feammox-N2 in three Feammox pathways. RBG-13-54-9, Brevundimonas, and Pelomonas played a vital role in the evolution of microbial communities. The characteristics of asynchronous changes between Feammox and iron reduction were found through long-term incubation. IRB might not be the key species directly driving Feammox, and it is necessary to reevaluate the role of IRB in Feammox process.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Oxirredução
/
Solo
/
Microbiologia do Solo
/
Ferro
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article