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Temporal dynamics of litter quality, soil types and microorganisms as main drivers of the priming effect

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorFANIN, Nicolas
hal.structure.identifierFractionnement des AgroRessources et Environnement [FARE]
dc.contributor.authorALAVOINE, Gonzague
hal.structure.identifierEcologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
dc.contributor.authorBERTRAND, Isabelle
dc.date.accessioned2024-04-08T11:53:20Z
dc.date.available2024-04-08T11:53:20Z
dc.date.conference2019-10-06
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195529
dc.description.abstractEnSoil C priming effect (PE) describes the change in the rate of soil organic matter (SOM) mineralization due to the addition of fresh organic matter (FOM), and is thus central to our evaluation of carbon (C) fluxes in terrestrial ecosystems. Towards a more mechanistic understanding of the terrestrial C cycle, our main objective was to evaluate dynamically the regulatory mechanisms that control PE. To do so, we followed the kinetics of C fluxes over 202 days and 23 dates after additions of two 13C-labeled plant litters varying in their initial quality from nutrient-rich and relatively accessible litter (non-mature wheat) to nutrient-poor and recalcitrant litter (flax stem) using four soil types originating from a land-use gradient (forest, plantation, grassland and cropland). We analyzed at three time points (at 27, 97, and 202 days) the mass loss rates for the main sugars within the cell wall, nutrient mineralization, hydrolytic and oxidative enzymes and the fate of the labeled 13C litters within the microbial biomass, the atmosphere and the SOM. We addressed for the first time the temporal dynamic in the main factors controlling PE by employing an a priori structural equation modelling (SEM) that allowed us to simultaneously test the effects of litter, soil and microbial parameters during FOM and SOM decomposition. Our results showed that FOM additions can rapidly stimulate a PE at the day-scale, with N availability playing a primordial role in the balance between FOM and SOM mineralization at the month-scale. However, C incorporation in the soil can counterbalance C losses via PE. Considering the temporal dynamic in the main drivers influencing PE can increase the predictive power of decomposition models that are currently limited by a lack of understanding in the regulatory mechanisms that control soil C fluxes from short- to long-term.
dc.language.isoen
dc.title.enTemporal dynamics of litter quality, soil types and microorganisms as main drivers of the priming effect
dc.typeCommunication dans un congrès
dc.subject.halSciences du Vivant [q-bio]/Sciences agricoles/Science des sols
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.conference.title7. International Symposium on Soil Organic Matter
bordeaux.countryAU
bordeaux.conference.cityAdelaide
bordeaux.peerReviewedoui
hal.identifierhal-02940578
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.end2019-10-11
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02940578v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=FANIN,%20Nicolas&ALAVOINE,%20Gonzague&BERTRAND,%20Isabelle&rft.genre=unknown


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