Estimating Extent of Mortality Associated with the Douglas-Fir Beetle in the Central and Northern Rockies
Document Type
Article
Journal/Book Title/Conference
Western Journal of Applied Forestry
Publication Date
1999
Issue
3
Volume
14
First Page
121
Last Page
127
Abstract
Data collected from Douglas-fir stands infected by the Douglas-fir beetle in Wyoming, Montana, Idaho, and Utah, were used to develop models to estimate amount of mortality in terms of basal area killed. Models were built using stepwise linear regression and regression tree approaches. Linear regression models using initial Douglas-fir basal area were built for all study sites but produce low precision estimates. Regression tree models using initial Douglas-fir basal area of stand density index or both were also build for all sites. Regression tree models provide a more realistic approach to estimate potential mortality by creating more homogenous mortality classes with reduced variance. The models developed provide land managers with a basis for determining the potential mortality should a Douglas-fir beetle outbreak develop.
Recommended Citation
Negron, J., Schaupp, W., Gibson, K., Anhold, J., Hansen, D., Thier, R. and Mocettini, P. (1999). Estimating Extent of Mortality Associated with the Douglas-fir Beetle in the Central and Northern Rockies. Western Journal of Applied Forestry, 14(3): 121-127.
Comments
Originally published by the Society of American Foresters.
Note: This article appears in the Western Journal of Applied Forestry.