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Abstract
The objective of the study was to develop models that predict lumber and veneer recovery as a function of young-growth log characteristics. Empirical lumber and veneer recovery data for logs cut from more than 300 young-growth Douglas-fir trees were used in model development. Trees were sampled from 15 stands in western Oregon and Washington and represent a wide range of growing conditions, sites, ages, and stocking history. Models were developed that predict (1) the volume recovery of primary (lumber and veneer) and secondary (chips, sawdust, and peeler cores) products, (2) lumber grade recovery based on machine stress-rated rules, (3) lumber grade recovery based on visual grading rules, and (4) veneer grade recovery. Log characteristics investigated were log diameter, the proportion of juvenile wood present in the log, log taper, and limb size. Lumber degrade caused by warping of juvenile wood was evaluated for low temperature, low humidity, kiln schedule.
Keywords
Douglas-fir,
young-growth,
juvenile wood,
lumber volume recovery,
lumber grade yields,
wood strength,
machine grading,
veneer volume recovery,
veneer grade yields,
Washington,
Oregon
Citation
Fahey, Thomas D.; Cahill, James M.; Snellgrove, Thomas A.; Heath, Linda S. 1991. Lumber and veneer recovery from intensively managed young-growth Douglas-fir. Res. Pap. PNW-RP-437. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 25 p
