Abstract
Context
Wildfires are common in localities where there is sufficient productivity to allow the accumulation of biomass combined with seasonality that allows this to dry and transition to a flammable state. An understanding of the conditions under which vegetated landscapes become flammable is valuable for assessing fire risk and determining how fire regimes may alter with climate change.
Objectives
Weather based metrics of dryness are a standard approach for estimating the potential for fires to occur in the near term. However, such approaches do not consider the contribution of vegetation communities. We aim to evaluate differences in weather-based dryness thresholds for fire occurrence between vegetation communities and test whether these are a function of landscape aridity.
Methods
We analysed dryness thresholds (using Drought Factor) for fire occurrence in six vegetation communities using historic fires events that occurred in South-eastern Australia using logistic regression. These thresholds were compared to the landscape aridity for where the communities persist.
Results
We found that dryness thresholds differed between vegetation communities, and this effect could in part be explained by landscape aridity. Dryness thresholds for fire occurrence were lower in vegetation communities that occur in arid environments. These communities were also exposed to dry conditions for a greater proportion of the year.
Conclusions
Our findings suggest that vegetation driven feedbacks may be an important driver of landscape flammability. Increased consideration of vegetation properties in fire danger indices may provide for better estimates of landscape fire risk and allow changes to fire regimes to be anticipated.
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Data availability
Fire and vegetation data can be accessed at http://www.data.vic.gov.au. Aridity data can be accessed at http://www.cgiar-csi.org/data/global-aridity-and-pet-database. Australian rainfall data can be accessed at http://www.bom.gov.au/jsp/ncc/climate_averages/rainfall/index.jsp.
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Acknowledgements
This work was undertaken as part of the project ‘Flammability of Tall Mist Forests’ which was funded via the Victorian Department of Environment, Land, Water and Planning (DELWP) and the Bushfire Climatology Project funded by DELWP and managed and administered by the Bushfire and Natural Hazards Cooperative Research Centre. Data were sourced from the Victorian Government data repository and the Department of Environment, Land, Water and Planning. We gratefully acknowledge the contribution of Miguel Cruz and Trent Penman in improving this manuscript, as well as the contribution of our anonymous referees.
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TD and JC conceived the ideas and designed methodology; TD and SH collected and analysed the data; TD led the writing of the manuscript. All authors contributed critically to the drafts and gave final approval for publication. All data will be archived on University servers.
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Duff, T.J., Cawson, J.G. & Harris, S. Dryness thresholds for fire occurrence vary by forest type along an aridity gradient: evidence from Southern Australia. Landscape Ecol 33, 1369–1383 (2018). https://doi.org/10.1007/s10980-018-0655-7
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DOI: https://doi.org/10.1007/s10980-018-0655-7