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Linking forest flammability and plant vulnerability to drought

Author(s): Rachael H. Nolan, Chris J. Blackman, Víctor Resco de Dios, Brendan Choat, Belinda Medlyn, Ximeng Li, Ross A. Bradstock, Matthias M. Boer
Year Published: 2020

Globally, fire regimes are being altered by changing climatic conditions. New fire regimes have the potential to drive species extinctions and cause ecosystem state changes, with a range of consequences for ecosystem services. Despite the co-occurrence of forest fires with drought, current approaches to modelling flammability largely overlook the large body of research into plant vulnerability to drought. Here, we outline the mechanisms through which plant responses to drought may affect forest flammability, specifically fuel moisture and the ratio of dead to live fuels. We present a framework for modelling live fuel moisture content (moisture content of foliage and twigs) from soil water content and plant traits, including rooting patterns and leaf traits such as the turgor loss point, osmotic potential, elasticity and leaf mass per area. We also present evidence that physiological drought stress may contribute to previously observed fuel moisture thresholds in south-eastern Australia. Of particular relevance is leaf cavitation and subsequent shedding, which transforms live fuels into dead fuels, which are drier, and thus easier to ignite. We suggest that capitalising on drought research to inform wildfire research presents a major opportunity to develop new insights into wildfires, and new predictive models of seasonal fuel dynamics.

Citation: Nolan, Rachael H.; Blackman, Chris J.; de Dios, Victor Resco; Choat, Brendan; Medlyn, Belinda E.; Li, Ximeng; Bradstock, Ross A.; Boer, Matthias M. 2020. Linking forest flammability and plant vulnerability to drought. Forests 11(7):779. https://doi.org/10.3390/f11070779
Topic(s): Fire Behavior, Weather, Fuels, Fuels Inventory & Monitoring
Ecosystem(s): None
Document Type: Book or Chapter or Journal Article
NRFSN number: 21684
FRAMES RCS number: 61643
Record updated: Aug 6, 2020