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Wood Relative Density Development in Red Pine (Pinus resinosa Ait.) Stands as Affected by Different Initial Spacings

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The relationship between wood relative density and growth rate in red pine (Pinus resinosa Ait.) trees originating from different initial spacings was examined. Wood relative density was also related to crown development, as affected by competition. At young ages, the relative densities of entire rings and of the earlywood and latewood zones and the percentages of earlywood within the rings did not differ much among the spacings. As stands grew older, however, ring relative density and earlywood and latewood relative densities increased while the percentage of earlywood decreased. The closer the spacing, the faster relative density increased and the percentage of earlywood decreased. These changes closely followed changes in crown ratio. A good fit was obtained for an equation relating ring relative density to age and percentage of latewood for trees of various ages originating from a wide range of initial spacings. Ring width, ring relative density, and percentage of earlywood were regressed against (1) crown width and distance between the base of the crown and breast height and (2) crown volume and crown ratio. These equations did not fit well at young ages. However, the strength of the relationships improved with age, which indicated the increasing influence of crown development on wood density. For. Sci. 41(4):709-728.

Keywords: Growth rings; crown development; earlywood; latewood

Document Type: Journal Article

Affiliations: Assorate Professor, Department of Forest Resources Management, University of British Columbia, 270-2357 Main Mall, Vancouver, British Columbia, Canada, V6T 1Z4

Publication date: 1995-11-01

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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