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Which Dependent Variable in Site Index-Height-Age Regressions?

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Two regressions relating height and site index can be calculated from stem analysis data. Site index estimation curves obtained by regressing site index on height and age differ from height growth curves obtained by regressing height on site index and age. The first provide estimates of site index for stands of known present age and height, while the second provide estimates of expected heights at different ages for stands of specified site index. The traditional type of height over age "site index curve" does not provide optimum estimates of site index. Magnitude and practical importance of differences depend on the amount of unexplained variation present. Appropriate uses of the two systems of curves and some sources of bias are discussed. Forest Sci. 20:74-87.

Keywords: Abies procera; Alnus rubra; Site index curves; growth curves; noble fir; red alder

Document Type: Journal Article

Affiliations: Mensurationsit, Pacific Northwest Forest and Range Exp. Stn., USDA Forest Service, Portland, Oreg

Publication date: 1974-03-01

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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