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

Jaan Parn 1, 2 Jos Verhoeven 3 Klaus Butterbach-Bahl 4 Nancy Dise 5 Sami Ullah 2 Anto Aasa 1 Sergey Egorov 1 Mikk Espenberg 1 Järvi Järveoja 1 Jyrki Jauhiainen 6 Kuno Kasak 1 Leif Klemedtsson 7 Ain Kull 1 Fatima Laggoun-Défarge 8, 9 Elena Lapshina 10 Annalea Lohila 11 Krista Lõhmus 12 Martin Maddison 1 William Mitsch Christoph Müller Ülo Niinemets 13 Bruce Osborne 14 Taavi Pae 1 Jüri-Ott Salm 15 Fotis Sgouridis 16 Kristina Sohar 1 Kaido Soosaar 1 Kathryn Storey 17 Alar Teemusk 1 Moses Tenywa 18 Julien Tournebize 19 Jaak Truu 1 Gert Veber 1 Jorge Villa 20 Seint Sann Zaw 21 Ulo Mander 1
Abstract : Nitrous oxide (N 2 O) is a powerful greenhouse gas and the main driver of stratospheric ozone depletion. Since soils are the largest source of N 2 O, predicting soil response to changes in climate or land use is central to understanding and managing N 2 O. Here we find that N 2 O flux can be predicted by models incorporating soil nitrate concentration (NO 3 −), water content and temperature using a global field survey of N 2 O emissions and potential driving factors across a wide range of organic soils. N 2 O emissions increase with NO 3 − and follow a bell-shaped distribution with water content. Combining the two functions explains 72% of N 2 O emission from all organic soils. Above 5 mg NO 3 −-N kg −1 , either draining wet soils or irrigating well-drained soils increases N 2 O emission by orders of magnitude. As soil temperature together with NO 3 − explains 69% of N 2 O emission, tropical wetlands should be a priority for N 2 O management.
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Jaan Parn, Jos Verhoeven, Klaus Butterbach-Bahl, Nancy Dise, Sami Ullah, et al.. Nitrogen-rich organic soils under warm well-drained conditions are global nitrous oxide emission hotspots. Nature Communications, Nature Publishing Group, 2018, 9 (1), 8 p. ⟨10.1038/s41467-018-03540-1⟩. ⟨insu-01759495⟩

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