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Estimating Site Index of Douglas-Fir (Pseudotsuga menziesii [Mirb.] Franco) from Ecological Variables in Southwestern British Columbia

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Relationships were examined between Douglas-fir site index (at 50 years breast height age), understory vegetation, and site classification units based on 88 sample plots from south coastal British Columbia. Analysis of variance showed differences in site index (P < 0.01) among the site units. Of the regression models tested, the one based on site units plus indicator species groups was most successful in predicting site index (R² = 0.87, SE = 2.96 m, and 75% of cases classified within 3 m of actual site index). The models using indicator species alone as variables had consistently poorer performance, which we attribute largely to inherent variation in understory vegetation. Further testing of the models over a wider range of sites and in earlier seral stages is suggested. For. Sci. 35(1):50-63.

Keywords: Douglas-fir; Site productivity; biogeoclimatic; ecosystem classification

Document Type: Journal Article

Affiliations: Faculty of Forestry, University of B.C., Vancouver, B.C. V6T 1W5, Canada

Publication date: 1989-03-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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