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An Expression of Diameter Distribution for Unbalanced, Uneven-Aged Stands and Forests

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From an analysis of records from more than 1,000 acres of northern hardwoods in the Northeast, a method was developed for expressing the size distribution of unbalanced, uneven-aged stands. The expression is based upon the finding that quotients between number of trees in successive 4-inch dbh classes plotted over the midpoints between dbh classes form an ascending straight line. A given diameter distribution can be expressed by the slope b and intercept a of this linear relationship; conversely, these terms can be used to construct given diameter distributions for any given stand density. The slope b is highly correlated with a, percent distribution of basal area by size groups, and numbers of trees per acre; hence, b serves as a useful basis for segregating northern hardwood stands into structural groups that reflect differences in those characteristics. Preliminary information indicates that this expression may be applicable under stand conditions other than those included in this study.

Document Type: Journal Article

Affiliations: Research Forester, Northeastern Forest Expt. Sta. Forest Service, U.S. Dept. Agric., Upper Darby, Pa.

Publication date: 1964-03-01

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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