Mechanisms of woody-plant mortality under rising drought, CO2 and vapour pressure deficit

Nate G. McDowell, Gerard Sapes, Alexandria Pivovaroff, Henry D. Adams, Craig D. Allen, William R.L. Anderegg, Matthias Arend, David D. Breshears, Tim Brodribb, Brendan Choat, Hervé Cochard, Miquel De Cáceres, Martin G. De Kauwe, Charlotte Grossiord, William M. Hammond, Henrik Hartmann, Günter Hoch, Ansgar Kahmen, Tamir Klein, D. Scott MackayMarylou Mantova, Jordi Martínez-Vilalta, Belinda E. Medlyn, Maurizio Mencuccini, Andrea Nardini, Rafael S. Oliveira, Anna Sala, David T. Tissue, José M. Torres-Ruiz, Amy M. Trowbridge, Anna T. Trugman, Erin Wiley, Chonggang Xu

Research output: Contribution to journalReview articlepeer-review

Abstract

Drought-associated woody-plant mortality has been increasing in most regions with multi-decadal records and is projected to increase in the future, impacting terrestrial climate forcing, biodiversity and resource availability. The mechanisms underlying such mortality, however, are debated, owing to complex interactions between the drivers and the processes. In this Review, we synthesize knowledge of drought-related tree mortality under a warming and drying atmosphere with rising atmospheric CO2. Drought-associated mortality results from water and carbon depletion and declines in their fluxes relative to demand by living tissues. These pools and fluxes are interdependent and underlay plant defences against biotic agents. Death via failure to maintain a positive water balance is particularly dependent on soil-to-root conductance, capacitance, vulnerability to hydraulic failure, cuticular water losses and dehydration tolerance, all of which could be exacerbated by reduced carbon supply rates to support cellular survival or the carbon starvation process. The depletion of plant water and carbon pools is accelerated under rising vapour pressure deficit, but increasing CO2 can mitigate these impacts. Advancing knowledge and reducing predictive uncertainties requires the integration of carbon, water and defensive processes, and the use of a range of experimental and modelling approaches.

Original languageEnglish
Pages (from-to)294-308
Number of pages15
JournalNature Reviews Earth and Environment
Volume3
Issue number5
DOIs
StatePublished - May 2022

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