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A Lognormal Approach to Diameter Distributions in Even-Aged Stands

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Diameter distributions of Douglas-fir can be described by the empirical three-parameter lognormal curve, in which the variate is y = log(y' + yo'). Following a description of both a graphic and a numerical solution for the origin or third parameter yo', the logarithm of the origin is shown to be a linear function of the logarithm of the initial mean dbh (y') in a series of 16 distributions. Given the predicted origins Yo', the means and standard deviations of y = log(y' + Yo') are simple functions of log y'. Agreement between the observed and the expected frequencies is tested by x2.

Document Type: Journal Article

Affiliations: Student in Yale College

Publication date: 1964-09-01

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  • 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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