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How do leaf and ecosystem measures of water-use efficiency compare?
- Source :
- New Phytologist, New Phytologist, Wiley, 2017, Epub ahead of print (3), ⟨10.1111/nph.14626⟩, New Phytologist, Wiley, 2017, Epub ahead of print, ⟨10.1111/nph.14626⟩, New Phytologist, 2017, Epub ahead of print (3), ⟨10.1111/nph.14626⟩, Medlyn, B E, De Kauwe, M G, Lin, Y S, Knauer, J, Duursma, R A, Williams, C A, Arneth, A, Clement, R, Isaac, P, Limousin, J M, Linderson, M L, Meir, P, Martin-StPaul, N K & Wingate, L 2017, ' How do leaf and ecosystem measures of water-use efficiency compare? ', New Phytologist . https://doi.org/10.1111/nph.14626
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- 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.
- Subjects :
- 0106 biological sciences
cycle du carbone
Stomatal conductance
010504 meteorology & atmospheric sciences
Databases, Factual
Physiology
Eddy covariance
stable isotopes
Plant Science
réserve en eau de la plante
Forests
Atmospheric sciences
Poaceae
01 natural sciences
isotope stable
Water balance
Efficience d'utilisation de l'eau
dynamique des écosystèmes
carbon cycle
eddy covariance
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
Ecosystem
conductance stomatique
water-use efficiency
photosynthèse
Water cycle
Water-use efficiency
bilan hydrique
0105 earth and related environmental sciences
Transpiration
photosynthesis
Ecology
Water
Plant Transpiration
Vegetation
15. Life on land
leaf gas exchange
Plant Leaves
13. Climate action
stomatal conductance
covariance
Environmental science
plant functional type (PFT)
utilisation de l'eau
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 0028646X and 14698137
- Database :
- OpenAIRE
- Journal :
- New Phytologist, New Phytologist, Wiley, 2017, Epub ahead of print (3), ⟨10.1111/nph.14626⟩, New Phytologist, Wiley, 2017, Epub ahead of print, ⟨10.1111/nph.14626⟩, New Phytologist, 2017, Epub ahead of print (3), ⟨10.1111/nph.14626⟩, Medlyn, B E, De Kauwe, M G, Lin, Y S, Knauer, J, Duursma, R A, Williams, C A, Arneth, A, Clement, R, Isaac, P, Limousin, J M, Linderson, M L, Meir, P, Martin-StPaul, N K & Wingate, L 2017, ' How do leaf and ecosystem measures of water-use efficiency compare? ', New Phytologist . https://doi.org/10.1111/nph.14626
- Accession number :
- edsair.doi.dedup.....6418d9addb046d5455037e3550bbb1aa