Fire mosaics in south-west Australian forest landscapes
Neil Burrows
A C , Connor Stephens B , Allan Wills A and Valerie Densmore A
+ Author Affiliations
- Author Affiliations
A Department of Biodiversity, Conservation and Attractions, Brain Street, Manjimup, WA 6258, Australia.
B Department of Forest and Wildlife Ecology, University of Wisconsin–Madison, Madison, WI 53707, USA.
C Corresponding author. Email: bigurda1@bigpond.net.au
International Journal of Wildland Fire 30(12) 933-945 https://doi.org/10.1071/WF20160
Submitted: 2 October 2020 Accepted: 24 September 2021 Published: 1 November 2021
Journal Compilation © IAWF 2021 Open Access CC BY-NC-ND
Abstract
In fire-prone environments, prescribed burning is important for achieving many public land management objectives including protecting communities and the environment from damaging bushfires. There is evidence that in some biomes, reducing the size of burnt patches and creating a fine-scale mosaic of vegetation at different times since last fire (seral stages) may benefit biodiversity. However, planning and implementing an ongoing burning program to achieve this is problematic. To advance an understanding of the factors affecting burn patch size and seral diversity metrics, a novel experimental management trial that aimed to create and quantify a fine-scale fire mosaic was implemented in a south-west Australian forest landscape. The 10-year trial demonstrated that the fire mosaic characteristics, including diversity of seral stages, burnt patch size, patch distribution and patch connectedness, can be managed to a large extent by ignition frequency, which affects landscape fuel flammability, and the timing of the introduction of fire with respect to weather conditions. In this trial, the frequent introduction of fire under low to moderate Forest Fire Danger Indices resulted in a landscape comprising a quantifiably higher diversity of seral stages and smaller burnt patches than adjacent areas treated by fuel reduction prescribed burns and by a high intensity bushfire.
Keywords: prescribed fire, fire mosaic, seral diversity, bushfire, experimental management.
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