Agritrop
Home

Potassium fertilization increases water-use efficiency for stem biomass production without affecting intrinsic water-use efficiency in Eucalyptus grandis plantations

Battie Laclau Patricia, Delgado-Rojas Juan Sinforiano, Christina Mathias, Nouvellon Yann, Bouillet Jean-Pierre, De Cassia Piccolo Marisa, Moreira Marcelo Zacarias, De Moraes Gonçalves Jose Leonardo, Roupsard Olivier, Laclau Jean-Paul. 2016. Potassium fertilization increases water-use efficiency for stem biomass production without affecting intrinsic water-use efficiency in Eucalyptus grandis plantations. Forest Ecology and Management, 364 : pp. 77-89.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
[img] Published version - Anglais
Access restricted to CIRAD agents
License CC0 1.0 Public Domain Dedication.
Battie-Laclau 2016_FEM_Potassium fertilization increases water-use efficiency for stem biomass production without affecting intrinsic water-use efficiency in Eucalyptus grandis plantations.pdf

Télécharger (1MB) | Request a copy

Quartile : Q1, Sujet : FORESTRY

Abstract : Adaptive strategies to improve tree water-use efficiency (WUE) are required to meet the global demand for wood in a future drier climate. A large-scale throughfall exclusion experiment was set up in Brazil to study the interaction between water status and potassium (K) or sodium (Na) availability on the ecophysiology of Eucalyptus grandis trees. This experiment focused primarily on the changes in aboveground net primary production, stand water use, phloem sap and leaf δ13C, net CO2 assimilation and stomatal conductance. The correlations between these response variables were determined to gain insight into the factors controlling water-use efficiency in tropical eucalypt plantations. The intrinsic WUE in individual leaves (the ratio of net CO2 assimilation to stomatal conductance) was estimated at a very short time scale from the leaf gas exchange. Sap flow measurements were carried out to assess the WUE for stemwood production (the ratio of wood biomass increment to stand water use). Averaged over the two water supply regimes, the stemwood biomass 3 years after planting was 173% higher in trees fertilized with K and 79% higher in trees fertilized with Na than in trees with no K and Na addition. Excluding 37% of the throughfall reduced stemwood production only for trees fertilized with K. Total canopy transpiration between 1 and 3 years after planting increased from about 750 to 1300 mm y−1 in response to K fertilization with a low influence of the water supply regime. K fertilization increased WUE for stemwood production by approx. 60% with or without throughfall exclusion. There was a strong positive correlation between phloem sap δ13C and short-term leaf-level intrinsic WUE. Whatever the water and nutrient supply regime, the gas exchange WUE estimates were not correlated with WUE for stemwood production. Phloem sap δ13C and leaf δ13C were therefore not valuable proxies of WUE for stemwood production. The allocation pattern in response to nutrient and water supply appeared to be a major driver of WUE for stemwood production. In areas with very deep tropical soils and annual rainfall <1500 mm, our results suggest that breeding programs selecting the eucalypt clones with the highest growth rates tend to select the genotypes with the highest water-use efficiency for wood production. (Résumé d'auteur)

Mots-clés Agrovoc : Eucalyptus grandis, Plantation forestière, Fertilisation, Potassium, Croissance, Besoin en eau, Analyse de tissu foliaire, Sélection, Résistance à la sécheresse, Production forestière, Bois, Transport des substances nutritives, Sève, Phloème, Tige

Mots-clés géographiques Agrovoc : Brésil

Mots-clés libres : 13C, Eucalypt, Leaf gas exchange, Nutrition, Water deficit, Sap flow

Classification Agris : K10 - Forestry production
F61 - Plant physiology - Nutrition
F60 - Plant physiology and biochemistry
F62 - Plant physiology - Growth and development

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

Auteurs et affiliations

  • Battie Laclau Patricia, Universidade de São Paulo (BRA)
  • Delgado-Rojas Juan Sinforiano, UNIFESP (BRA)
  • Christina Mathias, CIRAD-PERSYST-UMR Eco&Sols (BRA) ORCID: 0000-0003-3618-756X
  • Nouvellon Yann, CIRAD-PERSYST-UMR Eco&Sols (BRA)
  • Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (BRA)
  • De Cassia Piccolo Marisa, CENA (BRA)
  • Moreira Marcelo Zacarias, CENA (BRA)
  • De Moraes Gonçalves Jose Leonardo, Universidade de São Paulo (BRA)
  • Roupsard Olivier, CIRAD-PERSYST-UMR Eco&Sols (CRI)
  • Laclau Jean-Paul, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-2506-214X

Source : Cirad-Agritrop (https://agritrop.cirad.fr/579462/)

View Item (staff only) View Item (staff only)

[ Page générée et mise en cache le 2021-04-18 ]