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

Sylvain Pellerin 1 Laure Bamière 2 Julie Constantin 3 Camille Launay 4 Raphaël Martin 4 Michele Schiavo 5 Denis Angers 6 Laurent Augusto 1 Jérôme Balesdent 7 Isabelle Basile Doelsch 7 Valentin Bellassen 8 Rémi Cardinael 9 Lauric Cécillon 10 Claire Chenu 11, 12 Joël Daroussin 13 Philippe Delacote 14 Nathalie Delame 2 Francois Gastal 15 Anne-Isabelle Graux 16 Bertrand Guenet 17 Sabine Houot 11, 12 Katja Klumpp 4 Elodie Letort 18 Manuel Martin 19 Bruno Mary 20 Safya Menasseri-Aubry 21 Delphine Meziere 22 Claire Mosnier 23 Thierry Morvan 24 Jean Roger-Estrade 25 Laurent Saint-André 26 Olivier Therond 27 Valérie Viaud 24 Olivier Rechauchère 5 Guy Richard 5
Abstract : 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.
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https://hal.inrae.fr/hal-02737947
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Submitted on : Tuesday, June 2, 2020 - 8:04:03 PM
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Sylvain Pellerin, Laure Bamière, Julie Constantin, Camille Launay, Raphaël Martin, et al.. A model-based assessment of the soil C storage potential at the national scale: A case study from France. Food security and climate change: 4 per 1000 initiative new tangible global challenges for the soil, Jun 2019, Poitiers, France. ⟨10.15454/1.5433098269609653E12⟩. ⟨hal-02737947⟩

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