Modelling Variable Fire Severity in Boreal Forests: Effects of Fire Intensity and Stand Structure

摘要: It is becoming clear that fires in boreal forests are not uniformly stand-replacing. On the contrary, marked variation fire severity, measured as tree mortality, has been found both within and among individual fires. important to understand conditions under which this can arise. We integrated forest sample plot data, allometries historical records a diameter class-structured model of 1.0 ha patches mono-specific black spruce jack pine stands northern Quebec, Canada. The accounts for crown initiation vertical spread into canopy. uses empirical relations between intensity, scorch height, percent scorched mortality simulate specifically reduction patch basal area due fire-caused mortality. A random regression analysis large simulated were used test an effect fireline stand structure, species composition pyrogeographic regions on resultant severity. Severity increased with intensity was lower stands. proportion burned at high severity (e.g. >75% area) 0.80 0.11 pine. identified thresholds below there sensitivity interactions structure. no evidence residual region after effects structure accounted for. presented here able produce range conditions. This suggests one factors causing observed