A biogeographic model of fire regimes in Australia: current and future implications
Abstract
Aim Patterns of fire regimes across Australia exhibit biogeographic variation in response to four processes. Variations in area burned and fire frequency result from differences in the rates of ‘switching’ of biomass growth, availability to burn, fire weather and ignition. Therefore differing processes limit fire (i.e. the lowest rate of switching) in differing ecosystems. Current and future trends in fire frequency were explored on this basis. Location Case studies of forests (cool temperate to tropical) and woodlands (temperate to arid) were examined. These represent a broad range of Australian biomes and current fire regimes. Methods Information on the four processes was applied to each case study and the potential minimum length of interfire interval was predicted and compared to current trends. The potential effects of global change on the processes were then assessed and future trends in fire regimes were predicted. Results Variations in fire regimes are primarily related to fluctuations in available moisture and dominance by either woody or herbaceous plant cover. Fire in woodland communities (dry climates) is limited by growth of herbaceous fuels (biomass), whereas in forests (wet climates) limitation is by fuel moisture (availability to burn) and fire weather. Increasing dryness in woodland communities will decrease potential fire frequency, while the opposite applies in forests. In the tropics, both forms of limitation are weak due to the annual wet/dry climate. Future change may therefore be constrained. Main conclusions Increasing dryness may diminish fire activity over much of Australia (dominance of dry woodlands), though increases may occur in temperate forests. Elevated CO 2 effects may confound or reinforce these trends. The prognosis for the future fire regime in Australia is therefore uncertain.
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Arid biome fires typically follow periods of above-average rainfall that produce sufficient biomass to carry fire.
“Arid biome fires typically follow periods of above-average rainfall that produce sufficient biomass to carry fire (Bradstock, 2010).”
From The human dimension of fire regimes on Earth (2011) · cites this paper as Bradstock, 2010
Fuel and weather show opposite trends along a productivity gradient: low-productivity environments usually do not produce enough fuel, whereas in high-biomass environments the fuel is usually too wet to burn.
“Fuel and weather show opposite trends along a productivity gradient: low-productivity environments usually do not produce enough fuel, whereas in high-biomass environments the fuel is usually too wet to burn.”
From Defining pyromes and global syndromes of fire regimes (2013) · cites this paper as [11]
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- Authors
- Bradstock, R. A.
- Affiliations
- University of Wollongong (AU)
- Corresponding author
- Bradstock, R. A.
- ORCID
- Bradstock, R. A.
- Venue
- Global Ecology and Biogeography
- Publisher
- Wiley
- Published
- 2010-02-05
- Volume
- 19
- Issue
- 2
- Pages
- 145-158
- ISSN
- 1466-822X (ISSN-L)
- 1466-8238
- OpenAlex
- W1522627058
- Cited by
- 798
- References
- 3
- Citations by year
- 2026: 53 · 2025: 63 · 2024: 52 · 2023: 87 · 2022: 84 · 2021: 72 · 2020: 57 · 2019: 39 · 2018: 58 · 2017: 41 · 2016: 40 · 2015: 36 · 2014: 26 · 2013: 29 · 2012: 37
- FWCI
- 25.96
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Global Ecology and Biogeography (publishedVersion)
- Research Online (University of Wollongong) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
- Physical Sciences › Environmental Science › Global and Planetary Change › Plant Water Relations and Carbon Dynamics
- Physical Sciences › Environmental Science › Ecology › Rangeland and Wildlife Management
- Keywords
- fire regimes, biogeographic variation, fire frequency, fuel moisture content, fire weather, ignition, biomass growth, climate change, global change, temperate forests, woodland, tropical forests, elevated CO2
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