Can N2O emissions offset the benefits from soil organic carbon storage?

Guenet Bertrand, Gabrielle Benoît, Chenu Claire, Arrouays Dominique, Balesdent Jérôme, Bernoux Martial, Bruni Elisa, Caliman Jean-Pierre, Cardinael Rémi, Chen Songchao, Ciais Philippe, Desbois Dominque, Fouche Julien, Frank Stefan, Hénault Catherine, Lugato Emanuele, Naipal Victoria, Nesme Thomas, Obersteiner Michael, Pellerin Sylvain, Powlson David, Rasse Daniel, Rees Frédéric, Soussana Jean-François, Su Yang, Tian Hanqin, Valin Hugo, Zhou Feng. 2021. Can N2O emissions offset the benefits from soil organic carbon storage?. Global Change Biology, 27 (2) : 237-256.

Quartile : Outlier, Sujet : BIODIVERSITY CONSERVATION / Quartile : Outlier, Sujet : ECOLOGY / Quartile : Outlier, Sujet : ENVIRONMENTAL SCIENCES

Résumé : 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 (N2O), a powerful greenhouse gas, and increasing SOC may influence N2O 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 N2O 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 N2O 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 N2O emissions.

Mots-clés Agrovoc : matière organique du sol, séquestration du carbone, réduction des émissions, oxyde nitreux, amendement organique, travail du sol, fertilité du sol, cycle du carbone, cycle de l'azote, interactions biologiques, émissions de gaz à effet de serre, carbone organique du sol

Mots-clés libres : Soil organic carbon, Climate change mitigation, N2O emissions, Carbon sequestration, Biochar, Cover crops agroforestry, Erosion, Greenhouse gases emissions, Land based mitigation, Organic amendment, Tillage

Classification Agris : P33 - Chimie et physique du sol

Champ stratégique Cirad : CTS 6 (2019-) - Changement climatique

Auteurs et affiliations

• Guenet Bertrand, CNRS (FRA) - auteur correspondant
• Gabrielle Benoît, AgroParisTech (FRA)
• Chenu Claire, AgroParisTech (FRA)
• Arrouays Dominique, INRAE (FRA)
• Balesdent Jérôme, INRAE (FRA)
• Bernoux Martial, FAO (ITA)
• Bruni Elisa, CNRS (FRA)
• Caliman Jean-Pierre, SMART Research Institute (IDN)
• Cardinael Rémi, CIRAD-PERSYST-UPR AIDA (ZWE) ORCID: 0000-0002-9924-3269
• Chen Songchao, INRAE (FRA)
• Ciais Philippe, CNRS (FRA)
• Desbois Dominque, INRAE (FRA)
• Fouche Julien, Université de Montpellier (FRA)
• Frank Stefan, IIASA (AUT)
• Hénault Catherine, INRAE (FRA)
• Lugato Emanuele, European Commission Directorate General Joint Research Centre (ITA)
• Naipal Victoria, CNRS (FRA)
• Nesme Thomas, INRAE (FRA)
• Obersteiner Michael, IIASA (AUT)
• Pellerin Sylvain, INRAE (FRA)
• Powlson David, Rothamsted Experiment Station (GBR)
• Rasse Daniel, NIBIO (NOR)
• Rees Frédéric, INRAE (FRA)
• Soussana Jean-François, INRAE (FRA)
• Su Yang, INRAE (FRA)
• Tian Hanqin, Auburn University (USA)
• Valin Hugo, IIASA (AUT)
• Zhou Feng, Université de Pékin (CHN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596459/)

Métriques

[ Page générée et mise en cache le 2024-11-18 ]