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Out-of-Roundness in Douglas-fir Stems

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Out-of-roundness (stem circumference not circular) of Douglas-fir stems was measured on cross sections of 806 trees felled and bucked according to current merchantability standards. Out-of-roundness (OOR) at stump height was greater than that in upper stem positions. Orientation of longest diameter (OLD) on gentle slopes showed significant, but slight, tendencies toward north and south directions and direction of slope. No such significant, or even apparent, tendencies were found on moderate or steep slopes. Because OLD was random in most circumstances, large-scale cruises using optical dendrometry for upper-stem measurements should be biased very little by OOR. The bias in volume estimates of individual trees, however, can be appreciable. Forest Sci. 21:365-370.

Keywords: Pseudotsuga menziesii; Stem diameter measurement; stem cross-section area

Document Type: Journal Article

Affiliations: Mensurationist, Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Olympia, Wash.

Publication date: December 1, 1975

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.
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