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

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

© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 225(2020), 6 vom: 01. März, Seite 2484-2497
1. Verfasser: Lavergne, Aliénor (VerfasserIn)
Weitere Verfasser: Voelker, Steve, Csank, Adam, Graven, Heather, de Boer, Hugo J, Daux, Valérie, Robertson, Iain, Dorado-Liñán, Isabel, Martínez-Sancho, Elisabet, Battipaglia, Giovanna, Bloomfield, Keith J, Still, Christopher J, Meinzer, Frederick C, Dawson, Todd E, Julio Camarero, J, Clisby, Rory, Fang, Yunting, Menzel, Annette, Keen, Rachel M, Roden, John S, Prentice, I Colin
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't leaf-internal CO2 concentration least-cost hypothesis optimality stable carbon isotopes tree rings water-use efficiency Carbon Isotopes Water mehr... 059QF0KO0R Carbon Dioxide 142M471B3J
Beschreibung
Zusammenfassung:© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.
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 model 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 intersite 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
Beschreibung:Date Completed 14.05.2021
Date Revised 14.05.2021
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.16314