Back to Search
Start Over
Historical changes in the stomatal limitation of photosynthesis: empirical support for an optimality principle
- Source :
- New Phytologist, New Phytologist, 2019, 225 (6), pp.2484-2497. ⟨10.1111/nph.16314⟩, New Phytologist, Wiley, 2019, 225 (6), pp.2484-2497. ⟨10.1111/nph.16314⟩
- Publication Year :
- 2019
-
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 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.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Physiology
Vapour Pressure Deficit
Plant Science
Atmospheric sciences
01 natural sciences
Panoply
TREE-RINGS
water-use efficiency
Photosynthesis
ComputingMilieux_MISCELLANEOUS
leaf-internal CO2 concentration
Carbon Isotopes
Atmospheric pressure
TEMPERATURE RESPONSE
Variance (accounting)
Vegetation
stable carbon isotope
least-cost hypothesi
LEAF NITROGEN
Life Sciences & Biomedicine
concentration
Stomatal conductance
[SDE.MCG]Environmental Sciences/Global Changes
MESOPHYLL CONDUCTANCE
Plant Biology & Botany
CARBON-ISOTOPE DISCRIMINATION
stable carbon isotopes
least-cost hypothesis
03 medical and health sciences
07 Agricultural and Veterinary Sciences
Water-use efficiency
ATMOSPHERIC CO2
PLANT
Science & Technology
Plant Sciences
leaf-internal CO
Water
tree ring
15. Life on land
06 Biological Sciences
Carbon Dioxide
MODEL
Plant Leaves
optimality
tree rings
030104 developmental biology
13. Climate action
Soil water
Environmental science
[SDV.EE.BIO]Life Sciences [q-bio]/Ecology, environment/Bioclimatology
ELEVATED CO2
Water use
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14698137 and 0028646X
- Volume :
- 225
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- The New phytologistReferences
- Accession number :
- edsair.doi.dedup.....ad8ae33057e57cb47af8c653b66e41cc