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Using Competitive Stress Index to Estimate Diameter Growth for Thinned Douglas-fir Stands

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A set of linear growth equations was developed using initial tree diameter (DBH), initial competitive stress index (CSI), and change in CSI due to thinning as independent variables to predict periodic tree-diameter growth response for a 3- and 4-year growth period. Data from a regional levels-of-growing-stock study in young-growth Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] provided the data base for computing the CSI values. Functions including all three independent variables accounted for the greatest variation in periodic diameter increment for both growth periods. Moreover, including transformations of initial CSI and change in CSI in the model provided significant improvements over a model based only on functions of initial DBH. Forest Sci. 29:491-499.

Keywords: Intertree competition; growing space; influence zone; stand models

Document Type: Journal Article

Affiliations: Professor, Department of Forest Management, Oregon State University, Corvallis, OR 97331

Publication date: September 1, 1983

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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