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- Title
Ammonium-derived nitrous oxide is a global source in streams.
- Authors
Wang, Shanyun; Lan, Bangrui; Yu, Longbin; Xiao, Manyi; Jiang, Liping; Qin, Yu; Jin, Yucheng; Zhou, Yuting; Armanbek, Gawhar; Ma, Jingchen; Wang, Manting; Jetten, Mike S. M.; Tian, Hanqin; Zhu, Guibing; Zhu, Yong-Guan
- Abstract
Global riverine nitrous oxide (N2O) emissions have increased more than 4-fold in the last century. It has been estimated that the hyporheic zones in small streams alone may contribute approximately 85% of these N2O emissions. However, the mechanisms and pathways controlling hyporheic N2O production in stream ecosystems remain unknown. Here, we report that ammonia-derived pathways, rather than the nitrate-derived pathways, are the dominant hyporheic N2O sources (69.6 ± 2.1%) in agricultural streams around the world. The N2O fluxes are mainly in positive correlation with ammonia. The potential N2O metabolic pathways of metagenome-assembled genomes (MAGs) provides evidence that nitrifying bacteria contain greater abundances of N2O production-related genes than denitrifying bacteria. Taken together, this study highlights the importance of mitigating agriculturally derived ammonium in low-order agricultural streams in controlling N2O emissions. Global models of riverine ecosystems need to better represent ammonia-derived pathways for accurately estimating and predicting riverine N2O emissions. NH4+-derived pathways, rather than NO3--derived pathway, are the dominant hyporheic N2O sources in lower-order streams. These findings provide insights into better estimation of N2O emissions in global models of riverine ecosystems and emphasize the importance of managing ammonium.
- Subjects
DENITRIFYING bacteria; NITRIFYING bacteria; AGRICULTURE; NITROUS oxide; EMISSION control
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48343-9