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Repeated prescribed fires decrease stocks and change attributes of coarse woody debris in a temperate eucalypt

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    Area of Science:

    • Forest Ecology
    • Fire Ecology
    • Biogeochemistry

    Background:

    • Single prescribed fires have minimal impact on coarse woody debris (CWD).
    • Cumulative effects of repeated low-intensity fires on CWD are unknown.
    • CWD is crucial for forest biodiversity and ecosystem function.

    Purpose of the Study:

    • To investigate the impact of repeated low-intensity prescribed fires on CWD attributes and stocks.
    • To assess the influence of fire season and frequency on CWD in Australian eucalypt forests.

    Main Methods:

    • Factorial experiment with two fire seasons (Autumn, Spring) and two frequencies (3-yearly High, 10-yearly Low).
    • Replicated treatments over five study areas for 27 years.
    • Analysis of CWD biomass, carbon, nitrogen, and physical attributes.

    Main Results:

    • Repeated fires significantly reduced CWD biomass and carbon stocks compared to control.
    • Fire treatments altered CWD carbon and nitrogen concentrations but not wood density.
    • High frequency and Autumn fires resulted in greater CWD loss, especially for decayed CWD and larger pieces.

    Conclusions:

    • Repeated low-intensity prescribed fires substantially decrease CWD stocks and alter its chemical properties.
    • A trade-off exists between wildfire risk reduction and CWD reduction.
    • Longer fire intervals (10 years) and moist conditions can lessen negative impacts on CWD.