Évaluation de l'équation de Nye-Tinker-Barber pour la modélisation du prélèvement de cadmium par le maïs et le tabouret calaminaire

Abstract : This mechanistic modelling approach aimed to understand the soil-to-plant trace element transfers. The model solves diffusion-convection equation of cadmium (Cd) within the soil under the influence of the depletion of the solution concentration during plant absorption. A growth chamber experiment was conducted with a loamy cultivated soil enriched with CdSO4. Roots and shoots were collected after 12 and 24 days for maize and after 3 months for penny-cress. The soil offer (or phytoavailability) was assessed thanks to chemical extractions, adsorption or desorption isotherms, and isotopic exchange kinetics. The latter method has been validated by the simulations. The plant demand was studied by radiolabelling in hydroponic cultivations for both plants. Maize root influx increased linearly with Cd concentration in the solution. Moreover, root influx was (i) 3 fold higher in low ionic competition solutions, (ii) 2,7 fold higher in 12-days-old plants than in 24-days-old, (iii) 1,4 fold higher in the middle of the day in comparison with the full-day period, (iv) not influenced by Cd exposure during cultivation. Between 70 and 87% of Cd seemed located in the apoplasm of the penny-cress roots. Although the model tested different root absorption functions, the simulations underestimated by 12 and 18% the 12-days-old and the 24-days-old maize uptakes respectively, and by a factor 3 the penny-cress uptake. This divergence is partly due to the difficulties in estimating root absorption parameters, witch need more research
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Jérôme Perriguey. Évaluation de l'équation de Nye-Tinker-Barber pour la modélisation du prélèvement de cadmium par le maïs et le tabouret calaminaire. Sciences agricoles. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL036N⟩. ⟨tel-01752747⟩

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