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Title: Mixed-severity fire regimes in dry forests of southern interior British Columbia, Canada

Author: Heyerdahl, Emily K.; Lertzman, Ken; Wong, Carmen M.;

Date: 2012

Source: Canadian Journal of Forest Research. 42: 88-98.

Publication Series: Scientific Journal (JRNL)

Description: Historical fire severity is poorly characterized for dry forests in the interior west of North America. We inferred a multicentury history of fire severity from tree rings in Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) - ponderosa pine (Pinus ponderosa Douglas ex P. Lawson & C. Lawson) forests in the southern interior of British Columbia, Canada. In 2 ha plots distributed systematically over 1105 ha, we determined the dates of fire scars, indicators of low-severity fire, from 125 trees and inferred dates of even-aged cohorts, potential indicators of high-severity fire, from establishment dates of 1270 trees. Most (76%) of the 41 plots contained fire-scarred trees with a mean plot-composite fire scar interval of 21 years (1700-1900). Most (76%) also contained one or two cohorts. At the plot scale, we inferred that the fire regime at most plots was of mixed severity through time (66%) and at the remaining plots of low (20%), high (10%), or unknown (4%) severity through time. We suggest that across our study area, the fire regime was mixed severity over the past several centuries, with low-severity fires most common and often extensive but small, high-severity disturbances also occasionally occurred. Our results present strong evidence for the importance of mixed-severity fire regimes in which low-severity fires dominate in interior Douglas-fir - ponderosa pine forests in western Canada.

Keywords: fire severity, fire regimes, dry forests, Douglas-fir, Pseudotsuga menziesii, ponderosa pine, Pinus ponderosa

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Heyerdahl, Emily K.; Lertzman, Ken; Wong, Carmen M. 2012. Mixed-severity fire regimes in dry forests of southern interior British Columbia, Canada. Canadian Journal of Forest Research. 42: 88-98.


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