Drought response strategies define the relative contributions of hydraulic dysfunction and carbohydrate depletion during tree mortality.
Patrick J. Mitchell,Anthony P. O'Grady,David T. Tissue,D. A. White,Maria Ottenschlaeger,Elizabeth A. Pinkard +5 more
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TLDR
Evidence is provided for a relationship between hydraulic regulation of water status and carbohydrate depletion during terminal drought and the role that duration of drought plays in facilitating carbohydrate consumption.Abstract:
Summary
Plant survival during drought requires adequate hydration in living tissues and carbohydrate reserves for maintenance and recovery. We hypothesized that tree growth and hydraulic strategy determines the intensity and duration of the ‘physiological drought’, thereby affecting the relative contributions of loss of hydraulic function and carbohydrate depletion during mortality.
We compared patterns in growth rate, water relations, gas exchange and carbohydrate dynamics in three tree species subjected to prolonged drought.
Two Eucalyptus species (E. globulus, E. smithii) exhibited high growth rates and water-use resulting in rapid declines in water status and hydraulic conductance. In contrast, conservative growth and water relations in Pinus radiata resulted in longer periods of negative carbon balance and significant depletion of stored carbohydrates in all organs. The ongoing demand for carbohydrates from sustained respiration highlighted the role that duration of drought plays in facilitating carbohydrate consumption.
Two drought strategies were revealed, differentiated by plant regulation of water status: plants maximized gas exchange, but were exposed to low water potentials and rapid hydraulic dysfunction; and tight regulation of gas exchange at the cost of carbohydrate depletion. These findings provide evidence for a relationship between hydraulic regulation of water status and carbohydrate depletion during terminal drought.read more
Citations
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Water stress-induced xylem hydraulic failure is a causal factor of tree mortality in beech and poplar
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References
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A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests
Craig D. Allen,Alison K. Macalady,Haroun Chenchouni,Dominique Bachelet,Nate G. McDowell,Michel Vennetier,Thomas Kitzberger,Andreas Rigling,David D. Breshears,Edward H. Hogg,Patrick Gonzalez,Rod Fensham,Zhen Zhang,Jorge Castro,N.A. Demidova,Jong Hwan Lim,Gillian Allard,Steven W. Running,Akkin Semerci,Neil S. Cobb +19 more
TL;DR: In this paper, the authors present the first global assessment of recent tree mortality attributed to drought and heat stress and identify key information gaps and scientific uncertainties that currently hinder our ability to predict tree mortality in response to climate change and emphasizes the need for a globally coordinated observation system.
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Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought?
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Regional vegetation die-off in response to global-change-type drought
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TL;DR: The results quantify a trigger leading to rapid, drought-induced die-off of overstory woody plants at subcontinental scale and highlight the potential for such die-offs to be more severe and extensive for future global-change-type drought under warmer conditions.
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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
Temperate forest trees and stands under severe drought: a review of ecophysiological responses, adaptation processes and long-term consequences
TL;DR: The role du couvert dans les echanges avec l'atmosphere is rappele puis integre dans l'analyse des reductions de bilan d'eau and de carbone in 2003 dus a regulation stomatique as discussed by the authors.
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