Evolution of soil organic carbon stocks and c:n ratios in arable soils / Célestin Valentin (2023)

Public ISBD Titre : Evolution of soil organic carbon stocks and c:n ratios in arable soils : effects of managements practices in a long-term experiment in northern France Titre original : Evolution des stocks de carbone organique et des ratios c:n en grandes cultures Type de document : Memoire (MFE) Auteurs : Célestin Valentin, Auteur ; Cyrille Thomas, Directeur de thèse Editeur : Lyon ; Avignon : Isara Année de publication : 2023 Importance : 28 p. Langues : Anglais (eng) Catégories : [Motbis 2025] azote [Motbis 2025] carbone organique Note de contenu : In a climate change perspective, increasing soil organic carbon (SOC) stocks has been suggested to counterbalance excess atmospheric C.However, the effect of management practices call for long-term assessments. In the ACBB Estrées-Mons, a long-term experiment (LTE), we assessed the SOC stock evolutions in six-contrasted arable cropping systems, overthe 2009-2021 period? Stocks were calculated at equivalent soil mass (ESM) up to 60 cm depth. The N surplus, i.a. the difference between total N inputs and exports, was also calculated on the same period. Carbon losse ranged from -0.12 t C ha-1 yr-1 in perennial cropping (RR-PER) to -0.48 t C ha-1 yr-1 in reduced nitrogen (RN) system for the topsoil (0-35 cm), and even greater depletions were observed in the whole soil profile. We observed a slight general decrease of the C:N ratio over study period without significant cropping system effect. N surplus proposed as a potential driver of the SOC stock, ranged from -5.5 in RN to +56.6 kg N ha-1 yr-1 in reduced tillage (RT). Inclusion of leguminous crops in RN-LEG increased n surplus and reduced SOC stock depletion in comparison to RN (significantly only for the whole sample soil profile). Organisme demandeur : INRAE HAUTS-DE-FRANCE Evolution of soil organic carbon stocks and c:n ratios in arable soils = Evolution des stocks de carbone organique et des ratios c:n en grandes cultures : effects of managements practices in a long-term experiment in northern France [Memoire (MFE)] / Célestin Valentin, Auteur ; Cyrille Thomas, Directeur de thèse . - Lyon ; Avignon : Isara, 2023 . - 28 p. Langues : Anglais (eng) Catégories : [Motbis 2025] azote [Motbis 2025] carbone organique Note de contenu : In a climate change perspective, increasing soil organic carbon (SOC) stocks has been suggested to counterbalance excess atmospheric C.However, the effect of management practices call for long-term assessments. In the ACBB Estrées-Mons, a long-term experiment (LTE), we assessed the SOC stock evolutions in six-contrasted arable cropping systems, overthe 2009-2021 period? Stocks were calculated at equivalent soil mass (ESM) up to 60 cm depth. The N surplus, i.a. the difference between total N inputs and exports, was also calculated on the same period. Carbon losse ranged from -0.12 t C ha-1 yr-1 in perennial cropping (RR-PER) to -0.48 t C ha-1 yr-1 in reduced nitrogen (RN) system for the topsoil (0-35 cm), and even greater depletions were observed in the whole soil profile. We observed a slight general decrease of the C:N ratio over study period without significant cropping system effect. N surplus proposed as a potential driver of the SOC stock, ranged from -5.5 in RN to +56.6 kg N ha-1 yr-1 in reduced tillage (RT). Inclusion of leguminous crops in RN-LEG increased n surplus and reduced SOC stock depletion in comparison to RN (significantly only for the whole sample soil profile). Organisme demandeur : INRAE HAUTS-DE-FRANCE

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