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

Battie Laclau Patricia, Laclau Jean-Paul, Domec Jean-Christophe, Christina Mathias, Bouillet Jean-Pierre, De Cassia Piccolo Marisa, De Moraes Gonçalves Jose Leonardo, Moreira e Moreira Rildo, Krusche Alex Vladimir, Bouvet Jean-Marc, Nouvellon Yann. 2014. Effects of potassium and sodium supply on drought-adaptive mechanisms in Eucalyptus grandis plantations. New Phytologist, 203 (2) : pp. 401-413.

Journal article ; Article de revue à facteur d'impact
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Quartile : Outlier, Sujet : PLANT SCIENCES

Abstract : 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. (Résumé d'auteur)

Mots-clés Agrovoc : Eucalyptus grandis, Adaptation, Sécheresse, Résistance à la sécheresse, Potassium, Déficit hydrique du sol, Sodium, Transpiration, Stomate, Pression osmotique, Changement climatique, adaptation aux changements climatiques

Mots-clés géographiques Agrovoc : Sao Paulo

Classification Agris : F61 - Plant physiology - Nutrition
H50 - Miscellaneous plant disorders
P40 - Meteorology and climatology
P33 - Soil chemistry and physics

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

Auteurs et affiliations

  • Battie Laclau Patricia, CENA (BRA)
  • Laclau Jean-Paul, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-2506-214X
  • Domec Jean-Christophe, INRA (FRA)
  • Christina Mathias, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0003-3618-756X
  • Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (BRA)
  • De Cassia Piccolo Marisa, CENA (BRA)
  • De Moraes Gonçalves Jose Leonardo, Universidade de São Paulo (BRA)
  • Moreira e Moreira Rildo, Universidade de São Paulo (BRA)
  • Krusche Alex Vladimir, CENA (BRA)
  • Bouvet Jean-Marc, CIRAD-BIOS-UMR AGAP (FRA)
  • Nouvellon Yann, CIRAD-PERSYST-UMR Eco&Sols (BRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573553/)

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