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Article << Previous     |     Next >>   Contents Vol 21(8)

Fuel treatment effects on tree mortality following wildfire in dry mixed conifer forests, Washington State, USA

Susan J. Prichard A B and Maureen C. Kennedy A

A School of Environmental and Forest Sciences, University of Washington, Box 352100, Seattle, WA, 98195, USA.
B Corresponding author. Email: sprich@uw.edu

International Journal of Wildland Fire 21(8) 1004-1013 http://dx.doi.org/10.1071/WF11121
Submitted: 22 August 2011  Accepted: 14 June 2012   Published: 1 August 2012


 
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Abstract

Fuel reduction treatments are increasingly used to mitigate future wildfire severity in dry forests, but few opportunities exist to assess their effectiveness. We evaluated the influence of fuel treatment, tree size and species on tree mortality following a large wildfire event in recent thin-only, thin and prescribed burn (thin-Rx) units. Of the trees that died within the first 3 years, most died in the first year regardless of treatment. First-year mortality was much higher in control and thin-only units (65 and 52%) than in thin-Rx units (37%). Cumulative third-year mortality followed a similar trend (78 and 64% in control and thin-only units) v. 43% in thin-Rx units. Percentage crown scorch is a strong predictor of mortality and is highly dependent on fuel treatment. Across all treatments, Pinus ponderosa had a lower probability of post-fire mortality than did Pseudotsuga menziesii. Finally, the probability of beetle attack on surviving trees was highest in large-diameter trees within thin-only treatments and lowest within thin-Rx treatments. This study contributes further evidence supporting the effectiveness of thinning and prescribed burning on mitigating post-fire tree mortality. We also present evidence that a combination of thinning and prescribed burning is associated with lower incidence of post-fire bark beetle attack.

Additional keywords: bark beetles, crown scorch, Pinus ponderosa, Pseudotsuga menziesii.


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