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Transpirational Drying of Douglas-Fir: Effect on Log Moisture Content and Insect Attack

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Young growth Douglas-fir, 16 to 24 inches in diameter, were felled and allowed to remain in the woods with various proportions of their crowns intact. Those trees with the greatest proportion of crown intact and that were least shaded lost the greatest amount of sapwood moisture. Significant reduction in moisture content and weight occurred after one month, with the maximum reduction attained after 3 to 4 months in the summer. Little drying occurred in the winter. Trees left without limbs sometimes gained moisture. Sapwood moisture contents ranged from lows of around 40 percent for trees with crowns intact to 140 percent for those with all limbs removed. The maximum difference in weight of wood on the variously treated trees was 20 pounds per cubic foot with 10-pound reductions being common after 3-4 months of transpirational drying. Bark and timber beetle attack varied with the drying condition of the trees.

Document Type: Journal Article

Affiliations: Thinning Contract Supervisor, Weyerhaeuser Co., Longview, Wash.

Publication date: November 1, 1969

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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