Ecological thresholds and the status of fire-sensitive Vegetation in western Arnhem Land, northern Australia: Implications for management

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    Abstract

    The paper examines the application of the ecological thresholds concept to fire management issues concerning fire-sensitive vegetation types associated with the remote, biodiversity-rich, sandstone Arnhem Plateau, in western Arnhem Land, monsoonal northern Australia. In the absence of detailed assessments of fire regime impacts on component biota such as exist for adjoining Nitmiluk and World Heritage Kakadu National Parks, the paper builds on validated 16-year fire history and vegetation structural mapping products derived principally from Landsat-scale imagery, to apply critical ecological thresholds criteria as defined by fire regime parameters for assessing the status of fire-sensitive habitat and species elements. Assembled data indicate that the 24000 km 2 study region today experiences fire regimes characterised generally by high annual frequencies (mean ≤ 36.6%) of large (>10 km2) fires that occur mostly in the late dry season under severe fire-weather conditions. Collectively, such conditions substantially exceed defined ecological thresholds for significant proportions of fire-sensitive indicator rain forest and heath vegetation types, and the long-lived obligate seeder conifer tree species, Callitris intratropica. Thresholds criteria are recognised as an effective tool for informing ecological fire management in a variety of geographic settings.

    Original languageEnglish
    Pages (from-to)127-146
    Number of pages20
    JournalInternational Journal of Wildland Fire
    Volume18
    Issue number2
    DOIs
    Publication statusPublished - 2009

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