A model-based assessment of the soil C storage potential at the national scale: A case study from France

Pellerin Sylvain, Bamiere Laure, Constantin Julie, Launay Camille, Martin Raphael, Schiavo Michele, Angers Denis, Augusto Laurent, Balesdent Jérôme, Basile-Doelsch Isabelle, Bellassen Valentin, Cardinael Rémi, Cécillon Lauric, Ceschia Eric, Chenu Claire, Daroussin Joel, Delacote Philippe, Delame Nathalie, Gastal François, Graux Anne-Isabelle, Guenet Bertrand, Houot Sabine, Klumpp Katja, Letort Elodie, Martin Manuel, Mary Bruno, Menasseri Safya, Meziere Delphine, Mosnier Claire, Morvan Thierry, Roger-Estrade Jean, Saint-André Laurent, Thérond Olivier, Viaud Valérie, Réchauchère Olivier, Richard Guy. 2019. A model-based assessment of the soil C storage potential at the national scale: A case study from France. In : Book of abstracts: International Conference Food Security Climate Change: 4 per mille initiative new tangible global challenges for the soil. INRA, Université de Poitiers, 4 per 1000. Lusignan : INRA, Résumé, p. 49. International Conference Food Security Climate Change: 4 per mille initiative new tangible global challenges for the soil, Poitiers, France, 18 Juin 2019/20 Juin 2019.

Résumé : The recent controversy about the 4 per 1000 initiative has emphasized the need for a quantitative assessment of the C storage potential of agricultural soils. Moreover a clear distinction is required between the biophysically and the economically achievable potentials. Here we used a modelling approach at a fine spatial-scale resolution (< 8 km2) to quantify the additional C storage in agricultural soils of mainland France following the implementation, when feasible, of a range of soil C storing practices (i.e. cover crops, reduced tillage, new C inputs, grazing instead of mowing,…). The additional cost for farmers was also calculated, thus yielding the cost per Mg of additional C stored in soils. Results showed that the average additional C storage calculated over 30 years ranged between +0.028 and + 0.466 Mg C ha-1 yr-1 (i.e. between +0.5 and +7.2‰) for the different tested practices, with a very high spatial variability over France for each practice related to initial C stocks and pedo-climatic conditions. The storing practices where then ranked according to the cost of the additional C stored in soils (expressed in euro per Mg of C) and an optimal cost-efficient strategy was proposed at the national level.

Auteurs et affiliations

• Pellerin Sylvain, INRA (FRA)
• Bamiere Laure, INRA (FRA)
• Constantin Julie, INRA (FRA)
• Launay Camille, INRA (FRA)
• Martin Raphael, INRA (FRA)
• Schiavo Michele, INRA (FRA)
• Angers Denis, Agriculture and Agri-Food Canada (CAN)
• Augusto Laurent, INRA (FRA)
• Balesdent Jérôme, INRA (FRA)
• Basile-Doelsch Isabelle, INRA (FRA)
• Bellassen Valentin, INRA (FRA)
• Cardinael Rémi, CIRAD-PERSYST-UPR AIDA (ZWE) ORCID: 0000-0002-9924-3269
• Cécillon Lauric, IRSTEA (FRA)
• Ceschia Eric, INRA (FRA)
• Chenu Claire, AgroParisTech (FRA)
• Daroussin Joel, INRA (FRA)
• Delacote Philippe, INRA (FRA)
• Delame Nathalie, INRA (FRA)
• Gastal François, INRA (FRA)
• Graux Anne-Isabelle, INRA (FRA)
• Guenet Bertrand, CNRS (FRA)
• Houot Sabine, INRA (FRA)
• Klumpp Katja, INRA (FRA)
• Letort Elodie, INRA (FRA)
• Martin Manuel, INRA (FRA)
• Mary Bruno, INRA (FRA)
• Menasseri Safya, Agrocampus Ouest (FRA)
• Meziere Delphine, INRA (FRA)
• Mosnier Claire, INRA (FRA)
• Morvan Thierry, INRA (FRA)
• Roger-Estrade Jean, AgroParisTech (FRA)
• Saint-André Laurent, INRA (FRA)
• Thérond Olivier, INRA (FRA)
• Viaud Valérie, INRA (FRA)
• Réchauchère Olivier, INRA (FRA)
• Richard Guy, INRA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/592915/)

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