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    Author(s): Alain Leduc; Yves Bergeron; Sylvie Gauthier
    Date: 2007
    Source: In: Butler, Bret W.; Cook, Wayne, comps. The fire environment--innovations, management, and policy; conference proceedings. 26-30 March 2007; Destin, FL. Proceedings RMRS-P-46CD. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. CD-ROM. p. 187-193
    Publication Series: Proceedings (P)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (685 B)

    Description

    Canadian mixedwood forests have a high compositional and structural diversity. It includes both hardwood (aspen, balsam poplar, and white birch) and softwood (balsam fir, white spruce, black spruce, larch, and white cedar) species that can form pure stands or mixed stands. This heterogeneity results in a variety of vertical structural strata that can potentially interact with fire behaviour. Fourteen fire impact maps including information on preburn stand composition and structure were gathered in a Geographical Information System. The relative influence of prefire forest composition, stand density, and surficial deposits on postfire forest cover attributes (such as variation in proportion of green/red/charred trees) was analyzed using contingency tables. Many attributes of postfire forests (fire legacy) can be related to preburn forest composition and structure. Highest fire impact was observed in coniferous stands. At the other end of the spectrum, aspen stands and wetlands contributed to most of the fire skips. Within coniferous stands, there was a difference between species with regard to their susceptibility to windthrow following fire. Jack pine stands had less severe windthrow allowing for an abundance of snags, whereas windthrow is common in balsam fir stands. Impacts vary with regard to fire severity, suggesting that observed differences between stand types may be less important when fires are very intense. These results have consequences on the maintenance of the diversity of the forest mosaics through time as well as our capability to predict fire behaviour and impacts.

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    Citation

    Leduc, Alain; Bergeron, Yves; Gauthier, Sylvie. 2007. Relationships between prefire composition, fire impact, and postfire legacies in the boreal forest of Eastern Canada. In: Butler, Bret W.; Cook, Wayne, comps. The fire environment--innovations, management, and policy; conference proceedings. 26-30 March 2007; Destin, FL. Proceedings RMRS-P-46CD. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. CD-ROM. p. 187-193

    Keywords

    wildland fire management, Canadian mixedwood forests, boreal forest, fire behaviour, fire severity

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