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Living on the edge: a continental-scale assessment of forest vulnerability to drought


Peters, JMR and Lopez, R and Nolf, M and Hutley, LB and Wardlaw, T and Cernusak, LA and TJ, Wardlaw, Living on the edge: a continental-scale assessment of forest vulnerability to drought, Global Change Biology, 27, (15) pp. 3620-3641. ISSN 1354-1013 (2021) [Refereed Article]

Copyright Statement

2021 John Wiley & Sons Ltd.

DOI: doi:10.1111/gcb.15641


Globally, forests are facing an increasing risk of mass tree mortality events associated with extreme droughts and higher temperatures. Hydraulic dysfunction is considered a key mechanism of drought-triggered dieback. By leveraging the climate breadth of the Australian landscape and a national network of research sites (Terrestrial Ecosystem Research Network), we conducted a continental-scale study of physiological and hydraulic traits of 33 native tree species from contrasting environments to disentangle the complexities of plant response to drought across communities. We found strong relationships between key plant hydraulic traits and site aridity. Leaf turgor loss point and xylem embolism resistance were correlated with minimum water potential experienced by each species. Across the data set, there was a strong coordination between hydraulic traits, including those linked to hydraulic safety, stomatal regulation and the cost of carbon investment into woody tissue. These results illustrate that aridity has acted as a strong selective pressure, shaping hydraulic traits of tree species across the Australian landscape. Hydraulic safety margins were constrained across sites, with species from wetter sites tending to have smaller safety margin compared with species at drier sites, suggesting trees are operating close to their hydraulic thresholds and forest biomes across the spectrum may be susceptible to shifts in climate that result in the intensification of drought.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forestry sciences not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other plant production and plant primary products
Objective Field:Other plant production and plant primary products not elsewhere classified
UTAS Author:Wardlaw, T (Dr Timothy Wardlaw)
ID Code:152331
Year Published:2021
Web of Science® Times Cited:23
Deposited By:Office of the School of Natural Sciences
Deposited On:2022-08-17
Last Modified:2022-09-14

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