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Ten dominant or codominant trees were sampled from a 29-year-old black spruce stand, released at age 19, and ten of comparable dbh from a 77-year-old, unthinned stand. A variety of characteristics, including taper, volume, and specific gravity of the bole, as well as the change in specific gravity with age at breast height, were determined for trees from both stands. The older trees had significantly less taper, shorter crowns, approximately 1.9 times more merchantable volume and 10% higher specific gravity. The juvenile period for specific gravity was approximately 60 years. The higher specific gravity and merchantable volume of the older trees resulted in approximately 2.1 times more solid wood in the merchantable bole.
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Maine Agricultural Experiment Station
black spruce, wood properties
Wood Science and Pulp, Paper Technology
Shepard, R.K., Shottafter, J.E., and W.C. Bragg. 1991. Stand age and density effects on volume and spcific gravity of black spruce. Maine Agricultural Experiment Station Technical Bulletin 139.