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


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.

SUBMITTER: Parn J 

PROVIDER: S-EPMC5859301 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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

Pärn Jaan J   Verhoeven Jos T A JTA   Butterbach-Bahl Klaus K   Dise Nancy B NB   Ullah Sami S   Aasa Anto A   Egorov Sergey S   Espenberg Mikk M   Järveoja Järvi J   Jauhiainen Jyrki J   Kasak Kuno K   Klemedtsson Leif L   Kull Ain A   Laggoun-Défarge Fatima F   Lapshina Elena D ED   Lohila Annalea A   Lõhmus Krista K   Maddison Martin M   Mitsch William J WJ   Müller Christoph C   Niinemets Ülo Ü   Osborne Bruce B   Pae Taavi T   Salm Jüri-Ott JO   Sgouridis Fotis F   Sohar Kristina K   Soosaar Kaido K   Storey Kathryn K   Teemusk Alar A   Tenywa Moses M MM   Tournebize Julien J   Truu Jaak J   Veber Gert G   Villa Jorge A JA   Zaw Seint Sann SS   Mander Ülo Ü  

Nature communications 20180319 1


Nitrous oxide (N<sub>2</sub>O) is a powerful greenhouse gas and the main driver of stratospheric ozone depletion. Since soils are the largest source of N<sub>2</sub>O, predicting soil response to changes in climate or land use is central to understanding and managing N<sub>2</sub>O. Here we find that N<sub>2</sub>O flux can be predicted by models incorporating soil nitrate concentration (NO<sub>3</sub><sup>-</sup>), water content and temperature using a global field survey of N<sub>2</sub>O emis  ...[more]

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