.png){kind=icon}
.png){kind=icon}
Return
Ammonium-derived nitrous oxide is a global source in streams
.png){kind=icon}
OA
AI
DOI：10.1038/s41467-024-48343-9.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
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.
Keywords:
REDUCTASE GENES NIRK
NITRIFIER DENITRIFICATION
N2O EMISSION
DENITRIFYING BACTERIA
NITRATE REMOVAL
QUANTIFICATION
NITRIFICATION
OXIDATION
HOTSPOTS
OXYGEN
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
IF:
15.7
Papers:
9.2W
Citations:
91.2W