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Nitrogen-rich organic soils under warm well-drained conditions are global nitrous oxide emission hotspots.

Nitrogen-rich organic soils under warm well-drained conditions are global nitrous oxide emission hotspots. Thumbnail


Abstract

Nitrous oxide (N2O) is a powerful greenhouse gas and the main driver of stratospheric ozone depletion. Since soils are the largest source of N2O, predicting soil response to changes in climate or land use is central to understanding and managing N2O. Here we find that N2O flux can be predicted by models incorporating soil nitrate concentration (NO3-), water content and temperature using a global field survey of N2O emissions and potential driving factors across a wide range of organic soils. N2O emissions increase with NO3-and follow a bell-shaped distribution with water content. Combining the two functions explains 72% of N2O emission from all organic soils. Above 5?mg NO3--N kg-1, either draining wet soils or irrigating well-drained soils increases N2O emission by orders of magnitude. As soil temperature together with NO3-explains 69% of N2O emission, tropical wetlands should be a priority for N2O management.

Acceptance Date Feb 21, 2018
Publication Date Apr 26, 2018
Publicly Available Date Mar 29, 2024
Journal Nature Communications
Print ISSN 2041-1723
Pages 1135 -1135
DOI https://doi.org/10.1038/s41467-018-03540-1
Publisher URL http://dx.doi.org/10.1038/s41467-018-03540-1

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