Rhizosphere alkalisation, a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

Bravin Matthieu, Marti A.L., Clairotte Michael, Hinsinger Philippe. 2009. Rhizosphere alkalisation, a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil. Plant and Soil, 318 (1-2) : 257-268.

Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : SOIL SCIENCE / Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : The impact of a large rhizosphere alkalisation on copper (Cu) bioavailability to durum wheat (Triticum turgidum durum L.) initially exposed to a broad range of bulk soil pH (4.8-7.5) was studied. Plants were exposed to a Cu-contaminated soil treated with eight levels of lime (Ca(OH)2) and supplied with NO3 ? or NH4 +-NO3 ?. Nitrate-fed plants strongly increased their rhizosphere pH to about 6.9-7.6, whatever the initial pH. NH4 +-NO3 ?-fed plants slightly acidified their rhizosphere down to 3.9. Free Cu2+ concentration in the rhizosphere was 3 orders of magnitude larger for NH4 +-NO3 ? than NO3 ?fed plants. Consequently, Cu bioavailability was 2.4- to 4.2-fold larger for NH4 +?NO3 ?-fed plants which demonstrates the importance of rhizosphere alkalisation to restrict metal bioavailability in acidic soils. Copper bioavailability of NO3 ?-fed plants initially exposed to a broad range of bulk soil pH was insensitive to bulk soil pH, as rhizosphere pH was ultimately neutral in any case.

Mots-clés Agrovoc : Triticum turgidum, alcalinisation, rhizosphère, cuivre

Mots-clés géographiques Agrovoc : France

Classification Agris : P35 - Fertilité du sol
P33 - Chimie et physique du sol

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Bravin Matthieu, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-1436-7837
• Marti A.L., INRA (FRA)
• Clairotte Michael, INRA (FRA)
• Hinsinger Philippe, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/549684/)

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