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Can N$_2$O emissions offset the benefits from soil organic carbon storage?

Bertrand Guenet 1, 2 Benoit Gabrielle 3 Claire Chenu 3 Dominique Arrouays 4 Jérôme Balesdent 5 Martial Bernoux 6 Elisa Bruni 1 Jean-Pierre Caliman 7 Rémi Cardinael 8, 9, 10 Songchao Chen 4 Philippe Ciais 1, 11 Dominique Desbois 12 Julien Fouché 13 Stefan Frank 14 Catherine Henault 15, 16 Emanuele Lugato 17 Victoria Naipal 1 Thomas Nesme 18 Michael Obersteiner 14 Sylvain Pellerin 18 David Powlson 19 Daniel Rasse 20 Frédéric Rees 3 Jean-François Soussana 16 Yang Su 3 Hanqin Tian 21 Hugo Valin 14 Feng Zhou 22 
2 MOSAIC - Modélisation des Surfaces et Interfaces Continentales
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
Abstract : To respect the Paris agreement targeting a limitation of global warming below 2°C by 2100, and possibly below 1.5°C, drastic reductions of greenhouse gas emissions are mandatory but not sufficient. Large‐scale deployment of other climate mitigation strategies are also necessary. Among these, increasing soil organic carbon (SOC) stocks is an important lever because carbon in soils can be stored for long periods and land management options to achieve this already exist and have been widely tested. However, agricultural soils are also an important source of nitrous oxide (N$_2$O), a powerful greenhouse gas, and increasing SOC may influence N$_2$O emissions, likely causing an increase in many cases, thus tending to offset the climate change benefit from increased SOC storage. Here, we review the main agricultural management options for increasing SOC stocks. We evaluate the amount of SOC that can be stored as well as resulting changes in N$_2$O emissions to better estimate the climate benefits of these management options. Based on quantitative data obtained from published meta‐analyses and from our current level of understanding, we conclude that the climate mitigation induced by increased SOC storage is generally overestimated if associated N$_2$O emissions are not considered but, with the exception of reduced tillage, is never fully offset. Some options (e.g, biochar or non‐pyrogenic C amendment application) may even decrease N$_2$O emissions.
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Submitted on : Wednesday, June 1, 2022 - 1:37:53 PM
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Bertrand Guenet, Benoit Gabrielle, Claire Chenu, Dominique Arrouays, Jérôme Balesdent, et al.. Can N$_2$O emissions offset the benefits from soil organic carbon storage?. Global Change Biology, Wiley, 2021, 27 (2), pp.237-256. ⟨10.1111/gcb.15342⟩. ⟨hal-02958540⟩



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