Conversion of arable land to perennial bioenergy crops increases soil organic carbon stocks on the long term
2025
Ferchaud, Fabien | Marsac, Sylvain | Mary, Bruno | BioEcoAgro - UMR transfrontalière INRAe - UMRT1158 ; Université d'Artois (UA)-Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich (ULiège)-Université de Picardie Jules Verne (UPJV)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-JUNIA (JUNIA) ; Université catholique de Lille (UCL)-Université catholique de Lille (UCL) | Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | ARVALIS - Institut du végétal [Paris] | CE-CARB (Cultures Energétiques et stockage de CARBone dans les sols) a été financé par l'ADEME dans le cadre de l'appel à projet de Recherche GRAINE 2016 (gérer, produire et valoriser les biomasses).
International audience
اظهر المزيد [+] اقل [-]إنجليزي. Perennial C4 bioenergy crops can combine high productivity and low input requirements. However, their impact on soil organic carbon (SOC) stocks remains uncertain. The aim of this study was to assess the long-term impact of converting arable land to perennial bioenergy crops on SOC stocks for two crop species (miscanthus and switchgrass) and several crop management practices (nitrogen fertilization, harvest date and irrigation). We analyzed two long-term experiments located in northern and southern France. Both sites were sampled initially and after 12 or 13 years. SOC stocks were calculated at equivalent soil mass in each site and δ13C measurements were used to calculate changes in “new” and “old” SOC stocks. SOC stocks in the old ploughed layer increased significantly in both sites but most of the SOC storage occurred in the topsoil layer (∼0–5 cm). SOC storage rate was fairly similar between miscanthus and switchgrass but was much greater in the southern site than in the northern site (0.96 vs 0.26 t C ha−1 yr−1). This larger storage rate was mainly explained by higher carbon inputs, as suggested by the higher accumulation rate of new SOC (1.41 vs 0.86 t C ha−1 yr−1). No significant effect of the management practices on the SOC change rate could be detected, but early harvest systematically reduced SOC storage compared to late harvest (by 33 % for miscanthus and 12 % for switchgrass). Higher carbon inputs due to late harvest or irrigated conditions were partly compensated by a higher old SOC decrease.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique