Mixed-severity fire in lodgepole pine dominated forests: are historical regimes sustainable on Oregon's Pumice Plateau, USA? (Heyerdahl et al., 2014)

Fire ManagementFire Suppression
Written By FUSEE

Full Citation: Heyerdahl, E. K., Loehman, R. A., & Falk, D. A. (2014). Mixed-severity fire in lodgepole pine dominated forests: Are historical regimes sustainable on Oregon’s Pumice Plateau, USA? Canadian Journal of Forest Research, 44(6), 593–603. https://doi.org/10.1139/cjfr-2013-0413

Abstract: In parts of central Oregon, coarse-textured pumice substrates limit forest composition to low-density lodgepole pine (Pinus contorta Douglas ex Loudon var. latifolia Engelm. ex S. Watson) with scattered ponderosa pine (Pinus ponderosa Lawson & C. Lawson) and a shrub understory dominated by antelope bitterbrush (Purshia tridentata (Pursh) DC.). We reconstructed the historical fire regime from tree rings and simulated fire behavior over 783 ha of this forest type. For centuries (1650–1900), extensive mixed-severity fires occurred every 26 to 82 years, creating a multi-aged forest and shrub mosaic. Simulation modeling suggests that the historical mix of surface and passive crown fire were primarily driven by shrub biomass and wind speed. However, a century of fire exclusion has reduced the potential for the high-severity patches of fire that were common historically, likely by reducing bitterbrush cover, the primary ladder fuel. This reduced shrub cover is likely to persist until fire or insects create new canopy gaps. Crown fire potential may increase even with current fuel loadings if the climate predicted for midcentury lowers fuel moistures, but only under rare extreme winds. This study expands our emerging understanding of complexity in the disturbance dynamics of lodgepole pine across its broad North American range.


Keywords: fire behavior modeling, fire history, fire scars, antelope bitterbrush, ponderosa pine

FUSEE
Previous

Wildland fire emissions, carbon, and climate: Seeing the forest and the trees – A cross-scale assessment of wildfire and carbon dynamics in fire-prone, forested ecosystems (Loehman et al., 2013)
Next

Examining historical and current mixed-severity fire regimes in ponderosa pine and mixed-conifer forests of western North America (Odion et al., 2014)