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    Author(s): Corey L. Gucker; Stephen C. Bunting
    Date: 2011
    Source: Western North American Naturalist. 71(1): 97-105.
    Publication Series: Scientific Journal (JRNL)
    PDF: View PDF  (82.38 KB)

    Description

    Native and nonnative vegetation mosaics are common in western rangelands. If land managers could better predict changes in the abundance of native and nonnative species following disturbances, maintenance of native plant cover and diversity may be improved. In August 2000, during suppression of a wildfire near Lewiston, Idaho, a backing fire burned canyon grassland plots. A previous study had recorded species composition and cover prior to the fire, so we were able to evaluate changes in species composition and abundance on established plots before and after the fire. Overall, summer burning had little effect on the grassland communities. Pseudoroegneria spicata recovered to prefire coverage by the third postfire year. In the third postfire year, cover of native and nonnative annual species was significantly greater on burned than unburned sites (P < 0.03). Bromus tectorum cover increased, as expected, on burned plots. Prefire and postfire cover values for Centaurea solstitialis were nearly equal, and there were no significant cover differences between burned and unburned plots in any year. As part of this study, we also evaluated changes in the cover of dominant native and nonnative species with respect to their prefire seral stage on burned and unburned plots. Because our sample sizes were small, we only report community-level trends but suggest that this type of community analysis could make for an interesting future study.

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    Citation

    Gucker, Corey L.; Bunting, Stephen C. 2011. Canyon grassland vegetation changes following fire in northern Idaho. Western North American Naturalist. 71(1): 97-105.

    Keywords

    canyon grassland vegetation, fire, prefire coverage

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