BATTIE-LACLAU, Patricia; LACLAU, Jean-Paul; DOMEC, Jean-Christophe; CHRISTINA, Mathias; BOUILLET, Jean-Pierre; DE CASSIA PICCOLO, Marisa; DE MORAES GONÇALVES, José Leonardo; MOREIRA, Rildo Moreira E; KRUSCHE, Alex Vladimir; BOUVET, Jean-Marc; NOUVELLON, Yann

doi:10.1111/nph.12810

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BATTIE-LACLAU, Patricia
Centro de Energia Nuclear na Agricultura

LACLAU, Jean-Paul
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]
Departamento de Ciencia Florestal
Escola Superior de Agricultura Luiz de Queiroz

DOMEC, Jean-Christophe
Interactions Sol Plante Atmosphère [UMR ISPA]
Nicholas School of the Environment

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New Phytologist. 2014, vol. 203, n° 2, p. 401-413

Wiley

Résumé en anglais

A basic understanding of nutrition effects on the mechanisms involved in tree response to drought is essential under a future drier climate. * A large-scale throughfall exclusion experiment was set up in Brazil to gain an insight into the effects of potassium (K) and sodium (Na) nutrition on tree structural and physiological adjustments to water deficit. * Regardless of the water supply, K and Na supply greatly increased growth and leaf area index (LAI) of Eucalyptus grandis trees over the first 3 yr after planting. Excluding 37% of throughfall reduced above-ground biomass accumulation in the third year after planting for K- supplied trees only. E. grandis trees were scarcely sensitive to drought as a result of the utilization of water stored in deep soil layers after clear-cutting the previous plantation. Trees coped with water restriction through stomatal closure (isohydrodynamic behavior), osmotic adjustment and decrease in LAI. Additionally, droughted trees showed higher phloem sap sugar concentrations. * K and Na supply increased maximum stomatal conductance, and the high water requirements of fertilized trees increased water stress during dry periods. Fertilization regimes should be revisited in a future drier climate in order to find the right balance between improving tree growth and limiting water shortage.< Réduire

Mots clés

adaptation à la sécheresse

déficit hydrique

eucalyptus

fertilisation

brésil

Mots clés en anglais

drought

eucalypt

nutrition

osmotic adjustment

rainfall exclusion

stomatal conductance

water deficit

fertilization

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Effects of potassium and sodium supply on drought-adaptive mechanisms in Eucalyptus grandis plantations

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