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Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle

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Title: Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle
Authors: Lavergne, A
Voelker, S
Csank, A
Graven, H
De Boer, HJ
Daux, V
Robertson, I
Dorado-Liñán, I
Martínez-Sancho, E
Battipaglia, G
Bloomfield, KJ
Still, C
Meinzer, FC
Dawson, TE
Camarero, JJ
Clisby, R
Fang, Y
Menzel, A
Keen, RM
Roden, JS
Prentice, I
Item Type: Journal Article
Abstract: The ratio of leaf‐internal (ci) to ambient (ca) partial pressure of CO2, defined here as χ, is an index of adjustments in both leaf stomatal conductance and photosynthetic rate to environmental conditions. Measurements and proxies of this ratio can be used to constrain vegetation models uncertainties for predicting terrestrial carbon uptake and water use. We test a theory based on the least‐cost optimality hypothesis for modelling historical changes in χ over the 1951‐2014 period, across different tree species and environmental conditions, as reconstructed from stable carbon isotopic measurements across a global network of 103 absolutely‐dated tree‐ring chronologies. The theory predicts optimal χ as a function of air temperature, vapour pressure deficit, ca and atmospheric pressure. The theoretical model predicts 39% of the variance in χ values across sites and years, but underestimates the inter‐site variability in the reconstructed χ trends, resulting in only 8% of the variance in χ trends across years explained by the model. Overall, our results support theoretical predictions that variations in χ are tightly regulated by the four environmental drivers. They also suggest that explicitly accounting for the effects of plant‐available soil water and other site‐specific characteristics might improve the predictions.
Issue Date: Mar-2020
Date of Acceptance: 31-Oct-2019
URI: http://hdl.handle.net/10044/1/74852
DOI: 10.1111/nph.16314
ISSN: 0028-646X
Publisher: Wiley
Start Page: 2484
End Page: 2497
Journal / Book Title: New Phytologist
Volume: 225
Issue: 6
Copyright Statement: © 2019 The Authors New Phytologist © 2019 New Phytologist Trust. This is the accepted version of the following article: Lavergne, A. , Voelker, S. , Csank, A. , Graven, H. , de Boer, H. J., Daux, V. , Robertson, I. , Dorado‐Liñán, I. , Martínez‐Sancho, E. , Battipaglia, G. , Bloomfield, K. J., Still, C. J., Meinzer, F. C., Dawson, T. E., Camarero, J. J., Clisby, R. , Fang, Y. , Menzel, A. , Keen, R. M., Roden, J. S. and Prentice, I. C. (2019), Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle. New Phytol. Accepted Author Manuscript, which has been published in final form at https://doi.org/10.1111/nph.16314
Sponsor/Funder: AXA Research Fund
The Royal Society
Commission of the European Communities
Funder's Grant Number: AXA Chair Programme in Biosphere and Climate Impacts
NF170082
787203
Keywords: Science & Technology
Life Sciences & Biomedicine
Plant Sciences
leaf-internal CO2 concentration
least-cost hypothesis
optimality
stable carbon isotopes
tree rings
water-use efficiency
WATER-USE EFFICIENCY
CARBON-ISOTOPE DISCRIMINATION
ATMOSPHERIC CO2
MESOPHYLL CONDUCTANCE
TREE-RINGS
TEMPERATURE RESPONSE
LEAF NITROGEN
ELEVATED CO2
MODEL
PLANT
leaf-internal CO2 concentration
least-cost hypothesis
optimality
stable carbon isotopes
tree rings
water-use efficiency
Plant Biology & Botany
06 Biological Sciences
07 Agricultural and Veterinary Sciences
Publication Status: Published online
Online Publication Date: 2019-11-07
Appears in Collections:Space and Atmospheric Physics
Physics
Grantham Institute for Climate Change
Faculty of Natural Sciences