Towards a unified theory of plant photosynthesis and hydraulics
Martin M. White
- Vol. 8, Iss: 11, pp 1304-1316
TLDR
In this paper , a trait-based optimality theory was proposed to predict the simultaneous decline in carbon assimilation rate, stomatal conductance and photosynthetic capacity during progressive soil drought.Abstract:
Abstract The global carbon and water cycles are governed by the coupling of CO 2 and water vapour exchanges through the leaves of terrestrial plants, controlled by plant adaptations to balance carbon gains and hydraulic risks. We introduce a trait-based optimality theory that unifies the treatment of stomatal responses and biochemical acclimation of plants to environments changing on multiple timescales. Tested with experimental data from 18 species, our model successfully predicts the simultaneous decline in carbon assimilation rate, stomatal conductance and photosynthetic capacity during progressive soil drought. It also correctly predicts the dependencies of gas exchange on atmospheric vapour pressure deficit, temperature and CO 2 . Model predictions are also consistent with widely observed empirical patterns, such as the distribution of hydraulic strategies. Our unified theory opens new avenues for reliably modelling the interactive effects of drying soil and rising atmospheric CO 2 on global photosynthesis and transpiration. read more
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References
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Journal ArticleDOI
A Biochemical Model of Photosynthetic CO 2 Assimilation in Leaves of C 3 Species
TL;DR: Various aspects of the biochemistry of photosynthetic carbon assimilation in C3 plants are integrated into a form compatible with studies of gas exchange in leaves.
Journal ArticleDOI
Global convergence in the vulnerability of forests to drought
Brendan Choat,Steven Jansen,Timothy J. Brodribb,Hervé Cochard,Hervé Cochard,Sylvain Delzon,Radika Bhaskar,Sandra Janet Bucci,Taylor S. Feild,Sean M. Gleason,Uwe G. Hacke,Anna L. Jacobsen,Frederic Lens,Hafiz Maherali,Jordi Martínez-Vilalta,Stefan Mayr,Maurizio Mencuccini,Patrick J. Mitchell,Andrea Nardini,Jarmila Pittermann,R. Brandon Pratt,John S. Sperry,Mark Westoby,Ian J. Wright,Amy E. Zanne,Amy E. Zanne +25 more
TL;DR: In this article, the authors draw together published and unpublished data on the vulnerability of the transport system to drought-induced embolism for a large number of woody species, with a view to examining the likely consequences of climate change for forest biomes.
Journal ArticleDOI
A critical appraisal of a combined stomatal-photosynthesis model for C3 plants
TL;DR: Mijhoff et al. as discussed by the authors used gas exchange measurements on Eucalyptus grandis leaves and data extracted from the literature to test a semi-empirical model of stomatal conductance for CO 2, g sc = g 0 + a 1 /[(c s −Γ)(1 + D s /D 0 )], where A is the assimilation rate; D s and c s are the humidity deficit and the CO 2 concentration at the leaf surface, respectively; g 0 is the conductance as A → 0 when leaf irradiance → 0
Journal ArticleDOI
Terrestrial water fluxes dominated by transpiration
TL;DR: The dominance of transpiration water fluxes in continental evapotranspiration suggests that climate model development should prioritize improvements in simulations of biological fluxes rather than physical (evaporation) fluxes.
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