Australia's ancient peatlands — unique ecosystems that are both crucial carbon sinks and biodiversity hotspots — are facing an existential threat from intensifying bushfires. Yet, a surprising new perspective from The Conversation AU suggests that fire, when carefully managed, might also be their unlikely ally in protection.
These waterlogged wetlands, formed over millennia from partially decayed plant matter, store vast quantities of carbon; often more per hectare than rainforests. Globally, they cover just 3 per cent of the Earth's land surface but lock away an estimated 500 to 700 gigatonnes of carbon, making them vital in the fight against climate change. In Australia, they are pockets of ecological richness, home to rare and endemic species found nowhere else.
The Peat Paradox: A Fiery Predicament
The paradox lies in fire's dual nature. While severe, uncontrolled bushfires can devastate peatlands, releasing centuries of stored carbon into the atmosphere and destroying delicate habitats, some Australian peatlands have evolved with fire. As The Conversation AU reported, this is particularly true for those in fire-prone landscapes where Indigenous land management practices historically incorporated cool burns.
When a peatland burns in a high-intensity fire, the consequences are catastrophic. Unlike surface fires that consume only vegetation, peat fires can smoulder underground for weeks or months, difficult to detect and extinguish. These 'zombie fires' not only release massive amounts of greenhouse gases but also destroy the very structure of the peat, making recovery incredibly slow, if not impossible.
From Carbon Sinks to Carbon Sources
The transformation of peatlands from powerful carbon sinks into significant carbon sources is a grim reality highlighted by recent events. During the Black Summer bushfires of 2019-2020, several Australian peatlands, including areas within the World Heritage-listed Blue Mountains, experienced severe burning. The ecological toll was immense, with untold damage to fragile ecosystems and a substantial release of historical carbon stores.
Scientists estimate that the carbon released from such events can negate years of emissions reduction efforts. The global implications are also severe: if even a fraction of the world's peatlands were to burn, the impact on atmospheric carbon dioxide levels would be profound, accelerating global warming and making climate targets even harder to achieve.
Indigenous Wisdom and Controlled Burns
Crucially, the research points towards the potential of controlled burns, echoing traditional Indigenous land management. For thousands of years, Aboriginal communities practised fire-stick farming, using low-intensity fires to manage landscapes, promote biodiversity, and prevent catastrophic bushfires. This knowledge, often overlooked, is now gaining renewed attention as a viable strategy for protecting vulnerable ecosystems like peatlands.
Gentle, mosaic burning can reduce the build-up of flammable vegetation around peatland edges, creating firebreaks that protect the more sensitive, wetter core from intense wildfires. These cool burns also encourage the growth of certain peat-forming species and can clear invasive plants that might otherwise alter the peat's hydrological balance. Integrating traditional ecological knowledge with contemporary fire science offers a pathway to resilience.
Safeguarding Australia's Hidden Treasures
Protecting Australia's peatlands requires a multi-faceted approach. This includes enhanced monitoring, rapid response to ignition sources, and, critically, investing in sophisticated controlled burn programs. The economic value of these ecosystems, beyond their intrinsic ecological worth, is immense when considering their carbon sequestration services and role in water filtration.
With ongoing climate change promising hotter, drier conditions and more frequent extreme fire events, understanding and adaptively managing the relationship between fire and peatlands is paramount. The Conversation AU's report serves as a timely reminder that sometimes, the very force that threatens an ecosystem can, if wielded with knowledge and care, become its most potent protector.
