Variation in Sapwood Thickness of Douglas-Fir in Relation to Tree and Section Characteristics

Authors: Smith, J. H. G.; Walters, J.; Wellwood, R. W.

Source: Forest Science, Volume 12, Number 1, 1 March 1966 , pp. 97-103(7)

Publisher: Society of American Foresters

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Variation in sapwood thickness in 437 discs cut at stump height and from tops of 16-foot logs in 58 Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees is analyzed in relation to 10 tree and 11 section characteristics. Dbh, crown class, and crown width are shown to be the most important tree variables. Diameter outside bark, and rate of growth in the last decade, are the most important section variables. Thickness of sapwood bands and number of annual rings contained therein seem to be explained best by Jorgensen's theory describing formation of protection wood in terms of aeration and/or desiccation of sapwood.

Document Type: Journal Article

Affiliations: Professor

Publication date: March 1, 1966

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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.
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