Can stable isotopes quantify soil carbon build-up from organic fertilizers?

Jamoteau Floriane, Balesdent Jérôme, Basile-Doelsch Isabelle, Tillard Emmanuel, Versini Antoine. 2021. Can stable isotopes quantify soil carbon build-up from organic fertilizers?. Isotopes in Environmental and Health Studies, 57 (5) : 470-491.

Url - jeu de données - Entrepôt autre : https://figshare.com/articles/journal_contribution/Can_stable_isotopes_quantify_soil_carbon_build-up_from_organic_fertilizers_/15061022

Quartile : Q3, Sujet : CHEMISTRY, INORGANIC & NUCLEAR / Quartile : Q4, Sujet : ENVIRONMENTAL SCIENCES

Résumé : The application of organic fertilizers (OF) can supply carbon (C) to the soil in crop fields. OF-derived C (OF-C) is often estimated using the differential method that can be biased due to indirect effects of OF on soil C. This study tested three methods to quantify OF–C: (i) the widespread differential method, (ii) the synchronic isotope method comparing plots with and without OF and (iii) the asynchronic isotope method mimicking a trial without a control plot. These methods were implemented on an Arenosol and an Andosol supplied during 13 years with slurry or compost. The results highlighted the relevance of using the synchronic isotope method, which focuses on the direct effect of OFs on the soil organic matter (without bias of vegetation change) and considers control soil's evolution. The higher the isotopic difference between soil and OF, the shorter the method implementation time needed: for an initial difference of 7.5 ‰ and 3.5 ‰, quantification is suitable after 4 and 9 years of fertilization respectively. Attention should be paid to OF-δ13C variability to guarantee the method validity. The method proved to be suitable to study the factors controlling the OF-C fate in tropical soils.

Mots-clés Agrovoc : isotope stable, engrais organique, carbone organique du sol, lisier, compost, Arénosol, Andosol

Mots-clés géographiques Agrovoc : La Réunion

Mots-clés libres : Agroecosystem, Soil carbon sequestration, Manure, Slurry, Andosol, Arenosol, Carbon-13, Carbon transfer, Fertilization treatment

Classification Agris : P33 - Chimie et physique du sol
F04 - Fertilisation

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

Auteurs et affiliations

• Jamoteau Floriane, CIRAD-PERSYST-UPR Recyclage et risque (FRA) - auteur correspondant
• Balesdent Jérôme, CEREGE (FRA)
• Basile-Doelsch Isabelle, CNRS (FRA)
• Tillard Emmanuel, CIRAD-ES-UMR SELMET (REU)
• Versini Antoine, CIRAD-PERSYST-UPR Recyclage et risque (REU) ORCID: 0000-0002-5119-0567

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599387/)

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