Plants increase arsenic in solution but decrease the non-specifically bound fraction in the rhizosphere of an alkaline, naturally rich soil

Obeidy Carole, Bravin Matthieu, Bouchardon Jean-Luc, Conord Cyrille, Moutte Jacques, Guy Bernard, Faure Olivier. 2016. Plants increase arsenic in solution but decrease the non-specifically bound fraction in the rhizosphere of an alkaline, naturally rich soil. Ecotoxicology and Environmental Safety, 126 : 23-29.

Quartile : Q1, Sujet : TOXICOLOGY / Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES

Résumé : We aimed at determining the major physical-chemical processes that drive arsenic (As) dynamic in the rhizosphere of four species (Holcus lanatus, Dittrichia viscosa, Lotus corniculatus, Plantago lanceolata) tested for phytostabilization. Experiments were performed with an alkaline soil naturally rich in As. Composition of the soil solution of planted and unplanted pots was monitored every 15 days for 90 days, with a focus on the evolution of As concentrations in solution and in the non-specifically bound (i.e. easily exchangeable) fraction. The four species similarly increased As concentration in solution, but decreased As concentration in the non-specifically bound fraction. The major part (60%) of As desorbed from the non-specifically bound fraction in planted pots was likely redistributed on the less available fractions of As on the solid phase. A second part (35%) of desorbed As was taken up by plants. The minor part (5%) of desorbed As supplied As increase in solution. To conclude, plants induced a substantial redistribution of As on the less available fractions in the rhizosphere, as expected in phytostabilization strategies. Plants however concomitantly increased As concentration in the rhizosphere solution which may contribute to As transfer through plant uptake and leaching.

Mots-clés Agrovoc : rhizosphère, propriété physicochimique du sol, arsenic, transport des substances nutritives, lessivage du sol, Holcus lanatus, Lotus corniculatus, Plantago lanceolata, alcalinité, enracinement

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : Dittrichia viscosa

Classification Agris : P33 - Chimie et physique du sol
P35 - Fertilité du sol
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Obeidy Carole, Ecole nationale supérieure des mines de Saint-Etienne (FRA)
• Bravin Matthieu, CIRAD-PERSYST-UPR Recyclage et risque (REU) ORCID: 0000-0002-1436-7837
• Bouchardon Jean-Luc, Ecole nationale supérieure des mines de Saint-Etienne (FRA)
• Conord Cyrille, Ecole nationale supérieure des mines de Saint-Etienne (FRA)
• Moutte Jacques, Ecole nationale supérieure des mines de Saint-Etienne (FRA)
• Guy Bernard, Ecole nationale supérieure des mines de Saint-Etienne (FRA)
• Faure Olivier, CNRS (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/578802/)

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