Accounting for soil organic carbon role in land use contribution to climate change in agricultural LCA: Which methods? Which impacts?

Bessou Cécile, Tailleur Aurélie, Godard Caroline, Gac Armelle, Lebas de la Cour Julie, Boissy Joachim, Mischler Pierre, Caldeira-Pires Armando, Benoist Anthony. 2020. Accounting for soil organic carbon role in land use contribution to climate change in agricultural LCA: Which methods? Which impacts?. International Journal of Life Cycle Assessment, 25 (7) : 1217-1230.

Quartile : Q2, Sujet : ENGINEERING, ENVIRONMENTAL / Quartile : Q2, Sujet : ENVIRONMENTAL SCIENCES

Résumé : Purpose: Soil organic carbon (SOC) plays a key role in soil functioning and in greenhouse gas exchange with the atmosphere. Land use and land use changes can critically affect SOC. However, despite various methodological developments, there is still no scientific consensus on the best method to assess the holistic impact of land use and land use change within LCA. The SOCLE project aimed to review how SOC contribution to climate change is accounted for in LCA and to test the feasibility and sensitivity of best methodological options. Methods: In total, five crop products (annual/perennial, temperate/tropical) and two livestock products were investigated through 22 scenarios of land use changes (LUC) and agricultural land management changes (LMC). Three methods were applied: IPCC Tier 1-2 (2006), Müller-Wenk and Brandaõ (2010) and Levasseur et al. (2012). We also carried out a sensitivity analysis on key variables, notably carbon stocks, reference states, and regeneration times. Results and discussion: The accounting for LUC and LMC influenced greatly the results on the climate change impact. Compared to the impact of other GHG emissions, (i) LUC impacts ranged from − 23 to + 1702% with the IPCC method and from − 5 to + 336% with the Müller-Wenk and Brandaõ method, and (ii) LMC impacts from − 130 to + 54% and from − 31 to + 11%, respectively. The sensitivity analyses stressed the critical influence of all methodological and data choices on final results. Conclusions: Based on the project results, we recommend accounting systematically for the impact of LULUC on climate change by applying, a minima, the comprehensive IPCC Tier 1 approach (2006), which provides default factors for SOC accounting. Where available, case-specific data should be used (e.g., Tier 2) for SOC stocks but also C:N ratio in order to model the degressive impact over 90% of the time period needed to reach equilibrium.

Mots-clés Agrovoc : pratique agricole, retrait des terres, changement climatique, utilisation des terres, émission atmosphérique, gaz à effet de serre, analyse du cycle de vie, évaluation de l'impact, carbone organique du sol

Mots-clés libres : Agricultural practices, Climate Change, Land use, Soil organic carbon, Land use change

Classification Agris : F08 - Systèmes et modes de culture
P40 - Météorologie et climatologie

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Bessou Cécile, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA) ORCID: 0000-0001-6686-8468 - auteur correspondant
• Tailleur Aurélie, ARVALIS Institut du végétal (FRA)
• Godard Caroline, Agro-transfert, ressources et territoires (FRA)
• Gac Armelle, IDELE (FRA)
• Lebas de la Cour Julie, ARVALIS Institut du végétal (FRA)
• Boissy Joachim, Agro-transfert, ressources et territoires (FRA)
• Mischler Pierre, IDELE (FRA)
• Caldeira-Pires Armando, UNB [Universidade de Brasilia] (BRA)
• Benoist Anthony, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0001-6635-4192

Source : Cirad-Agritrop (https://agritrop.cirad.fr/595346/)

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