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    Author(s): F. G. Manwiller
    Date: 1972
    Source: USDA Forest Service Research Paper SO-78 25 pp.
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (5.7 MB)


    Weighted stem averagees were determined for wood and bard of 72 trees representing the commercial range of Pinus glabra Walt. The trees were stratified into three age classes (15, 30, and 45 years) and two growth rates (averaging 4.9 and 9.0 rings per inch). Within-stem variation was determined from 1,269 earlywood and alte wood sampling points in the 72 stems. Tracheid length increased with tree age and averaged 0.2 mm. longer in fast-grown trees than in slow-grown. Tracheid diameter did not differ with age, but radial and tangential diameters averaged 2 to 4 μm. larger in fast-grown trees. Wall thickness did not differ with age; walls of fast-grown latewood tracheids averaged 0.27 μm. thicker than those from slow-grown stems. Tracheids near the pith were short, of small diamter, and had thin walls with large fibril angels; those near the bark were longest and had the greatest diameters, thickest walls, and smallest fibril angles. Extracted specific gravity did not differ with age class or growth rate in earlywood and latewood. However, wood specific gravity averaged lower in fast-grown trees (0.408 unextracted) than in slow-grown (0.422) because fast-grown trees contained a greater proportion of large-diameter, thin-walled earlywood tracheids. Bark specific gravity averaged 0.391 in slow-grown trees and 0.371 in fast-grown. Bark thickness increased with tree age. Wood chemical components did not vary with age class or growth rate, and mechanical properties did not differ greatly. Microtensile strength and longitudinal shrinkage of earlywood and latewood did not vary with position of stem. Green volumes and ovendry weights are tabulated for bark and wood components.

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    Manwiller, F. G. 1972. Wood and Bark Properties of Spruce Pine. USDA Forest Service Research Paper SO-78 25 pp.

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