Disruption of cultural burning promotes shrub encroachment and unprecedented wildfires

Michela Mariani*, Simon E. Connor, Martin Theuerkauf, Annika Herbert, Petr Kuneš, David Bowman, Michael Shawn Fletcher, Lesley Head, A. Peter Kershaw, Simon G. Haberle, Janelle Stevenson, Matthew Adeleye, Haidee Cadd, Feli Hopf, Christy Briles

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    62 Citations (Scopus)

    Abstract

    Recent catastrophic fires in Australia and North America have raised broad-scale questions about how the cessation of Indigenous burning practices has impacted fuel accumulation and structure. For sustainable coexistence with fire, a better understanding of the ancient nexus between humans and flammable landscapes is needed. We used novel palaeoecological modeling and charcoal compilations to reassess evidence for changes in land cover and fire activity, focusing on southeast Australia before and after British colonization. Here, we provide what we believe is the first quantitative evidence that the region’s forests and woodlands contained fewer shrubs and more grass before colonization. Changes in vegetation, fuel structures, and connectivity followed different trajectories in different vegetation types. The pattern is best explained by the disruption of Indigenous vegetation management caused by European settlement. Combined with climate-change impacts on fire weather and drought, the widespread absence of Indigenous fire management practices likely preconditioned fire-prone regions for wildfires of unprecedented extent.

    Original languageEnglish
    Pages (from-to)292-300
    Number of pages9
    JournalFrontiers in Ecology and the Environment
    Volume20
    Issue number5
    DOIs
    Publication statusPublished - Jun 2022

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