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How do leaf and eco...
How do leaf and ecosystem measures of water-use efficiency compare?
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- Medlyn, Belinda E (author)
- Western Sydney University
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- De Kauwe, Martin G. (author)
- Macquarie University, Sydney
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- Lin, Yan-Shih (author)
- Centre INRA de Nancy-Lorraine,Macquarie University, Sydney
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- Knauer, Jürgen (author)
- Max Planck Institute for Biogeochemistry,Western Sydney University
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- Duursma, Remko A. (author)
- Western Sydney University
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- Williams, Christopher A. (author)
- Western Sydney University,Clark University
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- Arneth, Almut (author)
- Karlsruhe Institute of Technology
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- Clement, Rob (author)
- University of Edinburgh
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- Isaac, Peter (author)
- OzFlux
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- Limousin, Jean-Marc (author)
- University of Montpellier
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- Linderson, Maj Lena (author)
- Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science
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- Meir, Patrick (author)
- University of Edinburgh,Australian National University
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- Martin-Stpaul, Nicolas (author)
- INRA National Institute of Agricultural Research
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- Wingate, Lisa (author)
- National School of Agricultural Engineering, Bordeaux
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(creator_code:org_t)
- 2017-06-02
- 2017
- English.
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In: New Phytologist. - : Wiley. - 0028-646X .- 1469-8137. ; 216:3, s. 758-770
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Abstract
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- 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.
Keyword
- Eddy covariance
- Leaf gas exchange
- Plant functional type (PFT)
- Stable isotopes
- Stomatal conductance
- Water-use efficiency
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Medlyn, Belinda ...
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De Kauwe, Martin ...
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Lin, Yan-Shih
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Knauer, Jürgen
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Duursma, Remko A ...
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Williams, Christ ...
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show more...
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Arneth, Almut
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Clement, Rob
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Isaac, Peter
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Limousin, Jean-M ...
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Linderson, Maj L ...
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Meir, Patrick
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Martin-Stpaul, N ...
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Wingate, Lisa
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- Articles in the publication
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New Phytologist
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Lund University