MEDLYN, Belinda E.; DE KAUWE, Martin G.; LIN, Yan-Shih; KNAUER, Jürgen; DUURSMA, Remko A.; WILLIAMS, Christopher A.; ARNETH, Almut; CLEMENT, Rob; ISAAC, Peter; LIMOUSIN, Jean-Marc; LINDERSON, Maj-Lena; MEIR, Patrick; MARTIN-STPAUL, Nicolas; WINGATE, Lisa

doi:10.1111/nph.14626

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MEDLYN, Belinda E.
Hawkesbury Institute for the Environment [Richmond] [HIE]

DE KAUWE, Martin G.
Department of Biological Science

LIN, Yan-Shih
Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] [EEF]
Department of Biological Science

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Article de revue

Ce document a été publié dans

New Phytologist. 2017, vol. Epub ahead of print, n° 3, p. np

Wiley

Résumé en anglais

The terrestrial carbon and water cycles are intimately linked: the carbon cycle is driven by photosynthesis, while the water balance is dominated by transpiration, and both fluxes are controlled by plant stomatal conductance. The ratio between these fluxes, the plant water-use efficiency (WUE), is a useful indicator of vegetation function. WUE can be estimated using several techniques, including leaf gas exchange, stable isotope discrimination, and eddy covariance. Here we compare global compilations of data for each of these three techniques. We show that patterns of variation in WUE across plant functional types (PFTs) are not consistent among the three datasets. Key discrepancies include the following: leaf-scale data indicate differences between needleleaf and broadleaf forests, but ecosystem-scale data do not; leaf-scale data indicate differences between C3 and C4 species, whereas at ecosystem scale there is a difference between C3 and C4 crops but not grasslands; and isotope-based estimates of WUE are higher than estimates based on gas exchange for most PFTs. Our study quantifies the uncertainty associated with different methods of measuring WUE, indicates potential for bias when using WUE measures to parameterize or validate models, and indicates key research directions needed to reconcile alternative measures of WUE.< Réduire

Mots clés

dynamique des écosystèmes

Efficience d'utilisation de l'eau

cycle du carbone

photosynthèse

conductance stomatique

utilisation de l'eau

réserve en eau de la plante

covariance

bilan hydrique

isotope stable

Mots clés en anglais

eddy covariance

leaf gas exchange

plant functional type (PFT)

stable isotopes

stomatal conductance

water-use efficiency

carbon cycle

photosynthesis

URI

https://oskar-bordeaux.fr/handle/20.500.12278/196584

DOI

http://dx.doi.org/10.1111/nph.14626

Projet Européen

AgreenSkills+

Origine

Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391