Colonisation created a catastrophic wildfire loop in southeast Australia, making the region more susceptible to intense bushfires, a new study finds. The research, published in Nature, reveals how drastic land use changes following European settlement disrupted traditional fire management and led to denser forests that fuel more severe fires.
How Colonisation Created a Catastrophic Wildfire Loop
The study, conducted by researchers from the University of Melbourne in collaboration with the Gunaikurnai Land and Waters Aboriginal Corporation, reconstructed 1,000 years of vegetation and fire history at Purghagoolah, a lake in Croajingolong National Park, Victoria. By analysing pollen and charcoal in sediment cores, they uncovered a clear shift from open woodland to dense forest after colonisation.
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This shift, consistent with the loss of cultural burning practices and the removal of the Gunaikurnai people from their land, has created a feedback loop: denser vegetation leads to more intense fires, which in turn promote further vegetation growth, increasing fire risk. Lead author Michael-Shawn Fletcher notes that prior to colonisation, the landscape was “cared for and managed” by Indigenous peoples.
The Role of Cultural Burning
For millennia, Aboriginal Australians used cultural burning—low-intensity, controlled fires—to manage the land, reduce fuel loads, and promote biodiversity. This practice created a mosaic of open woodlands and grasslands that were less prone to catastrophic fires. When colonisation displaced Indigenous communities and banned cultural burning, the landscape changed dramatically.
Without regular burning, shrubs and trees encroached on open areas, creating continuous fuel that allows fires to spread rapidly and burn hotter. Climate change exacerbates this by increasing temperatures and drought, further drying out the dense vegetation.
Data Comparison: Pre- and Post-Colonisation Fire Regimes
| Period | Vegetation | Fire Frequency | Fire Intensity |
|---|---|---|---|
| Pre-colonisation (before 1788) | Open woodland, grasslands | Frequent, low-intensity | Low |
| Post-colonisation (after 1788) | Dense forest, shrubland | Less frequent but severe | High |
Key Takeaways
- Colonisation led to a shift from open woodland to dense forest in southeast Australia.
- The loss of cultural burning practices increased fuel loads and fire intensity.
- Climate change amplifies the risk by creating hotter, drier conditions.
- Reinstating Indigenous fire management could help break the catastrophic wildfire loop.
Implications for Bushfire Management
The findings highlight the need to integrate traditional ecological knowledge into modern fire management. The Gunaikurnai people and other Indigenous groups are calling for greater control over their lands to revive cultural burning. This approach not only reduces fire risk but also supports biodiversity and carbon storage.
As climate change continues to drive extreme weather, understanding the historical context of fire regimes is crucial. The study underscores that effective bushfire mitigation must address the legacy of colonisation and empower Indigenous land management.
FAQ
What is the catastrophic wildfire loop?
The catastrophic wildfire loop refers to a self-perpetuating cycle where dense vegetation leads to more intense fires, which in turn promote further vegetation growth, increasing future fire risk. This loop was initiated by colonisation’s disruption of Indigenous land management.
How did colonisation increase bushfire risk in Australia?
Colonisation removed Indigenous peoples from their lands and banned cultural burning, leading to a buildup of vegetation. This created denser forests that are more prone to high-intensity fires, especially under climate change.
What is cultural burning and how does it help?
Cultural burning is a traditional Indigenous practice of using low-intensity fires to manage landscapes. It reduces fuel loads, promotes biodiversity, and creates a mosaic of vegetation that is less susceptible to catastrophic wildfires.
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