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dc.creatorHummel, S.
dc.creatorAgee, J.K.
dc.description.abstractForest composition and structure on the eastern slope of the Cascade Mountains have been influenced by decades of fire exclusion. Multi-layered canopies and high numbers of shade-tolerant true fir (Abies) trees interact with western spruce budworm (Choristoneura occidentalis) to alter forest structure and to affect potential fire behaviour and effects. We compared measurements taken in 1992 (early budworm outbreak) and 2000 (late budworm outbreak) from 21 permanent plots located in a late successional reserve south of Mt. Adams in Washington, USA. Canopy closure decreased significantly, from a mean of 78% in 1992 to 43% in 2000, but the coarse woody debris load increased significantly during the same period, from approximately 40 to 80 tonnes ha-1. Tree mortality was mostly in the smaller (<20 cm) diameter classes. Potential surface fire flame lengths increased significantly from 1.4 m in 1992 to 1.9 m in 2000, but changes in torching potential and independent crown fire behaviour were not significant. Projections using the First Order Fire Effects Model indicate that a wildfire in conditions similar to those in 2000 would not be of stand replacement severity and would leave 148 trees ha-1 and more than 34 m2 ha-1 of basal area.en_US
dc.publisherWSU Press
dc.rightsIn copyright
dc.subjectbotanical composition
dc.subjectdead wood
dc.subjectfire behaviour
dc.subjectfire effects
dc.subjectforest damage
dc.subjectforest fires
dc.subjectforest pests
dc.subjectinsect pests
dc.subjectplant pests
dc.subjectstand characteristics
dc.subjectstand structure
dc.titleWestern spruce budworm defoliation effects on forest structure and potential fire behavior
dc.description.citationHummel and Agee "Western spruce budworm defoliation effects on forest structure and potential fire behavior." Northwest Science. 2003; 77(2): 159-169

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  • Northwest Science
    Northwest Science features original research in the basic and applied sciences, with emphasis on the Pacific Northwest region of the United States and Canada.

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