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The Assessment of Log Class Volumes within Trees by Probit Transformation

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Probit analysis is used in deriving expressions of log class yields in terms of tree size for Pinus patula. After grouping 676 sample tree data into l-inch dbh and 10-foot height classes, the percentage volume of individual log classes were accumulated from the lowest class (pulpwood) up to each of the six sawlog classes as recognized in South Africa. Regression equations of corresponding probits in terms of dbh and tree height were then derived. Upon transforming calculated profits to cumulative percentages, successive substraction rendered a tabulation of relative volume of each log class according to dbh and tree height, in a form for application to the timber cruise on financial yield study.

Document Type: Journal Article

Affiliations: Professor of Forest Management, Univ. of Stellenbosch, Republic of South Africa

Publication date: 1963-09-01

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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