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Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils by using a model analysis.

hal.structure.identifierLaboratoire Sols et Environnement [LSE]
dc.contributor.authorLIN, Zhongbing
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorSCHNEIDER, Andre
hal.structure.identifierLaboratoire Sols et Environnement [LSE]
dc.contributor.authorSTERCKEMAN, Thibault
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorNGUYEN, Christophe
dc.date.accessioned2024-04-08T12:10:54Z
dc.date.available2024-04-08T12:10:54Z
dc.date.issued2014
dc.date.conference2015-06-21
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196663
dc.description.abstractEnThis study aimed at determining the influential mechanisms governing the phytoavailability of the toxic trace element cadmium (Cd) in agricultural soils using a mechanistic model. We built a phytoavailability model simulating the Cd2+ uptake by 1 cm² root surface and including the transport by diffusion and convection, the kinetics of sorption/desorption and of complexation with the dissolved soil organic matter. The model variables were ranked by performing a sensitivity analysis where a 30-days uptake of Cd2+ was simulated for 100 000 combinations of the parameters chosen within ranges consistent with the French agricultural soils. Generally, the most influential variable was the initial concentration of Cd2+, which was low, making the root capacity for absorbing Cd2+ of little influence. The convection was almost always negligible and the diffusion was the dominant process of Cd phytoavailability. The soil impedance factor, the water content and more particularly the soil buffer power for Cd2+ were therefore the following most influential variables. The kinetics of adsorption and desorption were of little Influence. The Cd-complex was shown to generally contribute little to the uptake due to a strong kinetic limitation for the dissociation. Consequently, the dominant process buffering the Cd2+ concentration at the root surface was desorption. Significant complex contributions were observed for very labile complex and high water flux toward the root surface. On the whole, the simulated uptake correlated very well with a simplified model considering only the transport and sorption at equilibrium of Cd2+. This model relied on the total soil Cd concentration, the soil pH, the soil organic carbon content, the concentrations of calcium and dissolved organic matter, and the partitioning of the dissolved organic matter between fulvic and humic acids; these variables determined the soil/solution partitioning of Cd2+.
dc.language.isoen
dc.title.enRanking of mechanisms governing the phytoavailability of cadmium in agricultural soils by using a model analysis.
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halSciences du Vivant [q-bio]
bordeaux.pagenp
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.conference.titleRhizosphere 4
bordeaux.countryNL
bordeaux.conference.cityMaastricht
bordeaux.peerReviewednon
hal.identifierhal-01580670
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2015-06-25
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01580670v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2014&rft.spage=np&rft.epage=np&rft.au=LIN,%20Zhongbing&SCHNEIDER,%20Andre&STERCKEMAN,%20Thibault&NGUYEN,%20Christophe&rft.genre=conference


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