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• 1. [Article] Two thinnings of douglas-fir with crawler tractors : time differences

  Two intermediate cuttings were made in a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand on the Wilark forest management research area in northwestern Oregon. Age of trees in the stand varied ...

  Citation × Citation Citation Abstract Copy Title: Two thinnings of douglas-fir with crawler tractors : time differences Author: Kangur, Rudolf, Oregon State University. Forest Research Laboratory Two intermediate cuttings were made in a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand on the Wilark forest management research area in northwestern Oregon. Age of trees in the stand varied from 47 to 62 years at the first cutting. Crawler tractors were used in both extractions. In the first cutting, the time required for log production was 6.21 man-hours for a thousand board feet Scribner log rule at the mill site on the area. An additional 1.01 man-hours a thousand board feet was accounted for in delays not associated with productive time. A total of 19,702 feet of road was constructed. Construction time for 100 feet of road ranged from 1.55 man-hours for skid roads to 9.39 manhours for main road. Road construction increased total time for log production by 0.92 man-hour for a thousand board feet in the first cutting. The time required for log production in the second cutting was 3.78 man-hours for a thousand board feet, and delays amounted to 0.43 man-hour a thousand. A separate time study was made to determine the influence of delays present in the actual extractions on the cost of log production. Frequently ignored factors that appeared to affect economic outcome were favorable weather, efficient technique in extraction, and skilled labor. Title: Two thinnings of douglas-fir with crawler tractors : time differences Author: Kangur, Rudolf, Oregon State University. Forest Research Laboratory Two intermediate cuttings were made in a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand on the Wilark forest management research area in northwestern Oregon. Age of trees in the stand varied from 47 to 62 years at the first cutting. Crawler tractors were used in both extractions. In the first cutting, the time required for log production was 6.21 man-hours for a thousand board feet Scribner log rule at the mill site on the area. An additional 1.01 man-hours a thousand board feet was accounted for in delays not associated with productive time. A total of 19,702 feet of road was constructed. Construction time for 100 feet of road ranged from 1.55 man-hours for skid roads to 9.39 manhours for main road. Road construction increased total time for log production by 0.92 man-hour for a thousand board feet in the first cutting. The time required for log production in the second cutting was 3.78 man-hours for a thousand board feet, and delays amounted to 0.43 man-hour a thousand. A separate time study was made to determine the influence of delays present in the actual extractions on the cost of log production. Frequently ignored factors that appeared to affect economic outcome were favorable weather, efficient technique in extraction, and skilled labor. Close

• 2. [Article] Fuelwood characteristics of northwestern conifers and hardwoods

  This publication collates the published ranges of fuelwood characteristics for 33 conifer and 20 hardwood species in the Pacific Northwest. The following characteristics are covered: specific gravity, ...

  Citation × Citation Citation Abstract Copy Title: Fuelwood characteristics of northwestern conifers and hardwoods Author: Funck, James W., Wilson, Pamela L., Avery, Robert B., Oregon State University. Forest Research Laboratory This publication collates the published ranges of fuelwood characteristics for 33 conifer and 20 hardwood species in the Pacific Northwest. The following characteristics are covered: specific gravity, percent moisture content, higher heating value, and percent ash of wood and bark; percent bark by volume; and ultimate analysis (percent carbon, hydrogen, oxygen, nitrogen, and sulfur) of wood and bark. Title: Fuelwood characteristics of northwestern conifers and hardwoods Author: Funck, James W., Wilson, Pamela L., Avery, Robert B., Oregon State University. Forest Research Laboratory This publication collates the published ranges of fuelwood characteristics for 33 conifer and 20 hardwood species in the Pacific Northwest. The following characteristics are covered: specific gravity, percent moisture content, higher heating value, and percent ash of wood and bark; percent bark by volume; and ultimate analysis (percent carbon, hydrogen, oxygen, nitrogen, and sulfur) of wood and bark. Close

• 3. [Article] Early growth and drought avoidance in Douglas-fir seedlings

  Although the Douglas-fir region of the northwestern United States and British Columbia is frequently considered to have a common silviculture, obstacles to successful regeneration of the species range ...

  Citation × Citation Citation Abstract Copy Title: Early growth and drought avoidance in Douglas-fir seedlings Author: Heiner, Terry Charles, 1941-, Lavender, Denis P., Oregon State University. Forest Research Laboratory Although the Douglas-fir region of the northwestern United States and British Columbia is frequently considered to have a common silviculture, obstacles to successful regeneration of the species range from competing vegetation and mammals on the mesic sites to extreme drought and heat on the xeric southerly exposures in northern California and southern Oregon. Recent reports on Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, by Ferrell and Woodard (1), Pharis and Ferrell (8), and Zavitkovski and Ferrell (11, 12) describe studies that demonstrated differences by seed source of response to drought stress of Douglas-fir seedlings under laboratory and greenhouse conditions. Our study was undertaken to determine whether planting stock raised from seed collected from mesic and xeric sites would demonstrate a differential survival under drought stress. And, further, to determine whether such survival differences were correlated with definite seedling parameters. Title: Early growth and drought avoidance in Douglas-fir seedlings Author: Heiner, Terry Charles, 1941-, Lavender, Denis P., Oregon State University. Forest Research Laboratory Although the Douglas-fir region of the northwestern United States and British Columbia is frequently considered to have a common silviculture, obstacles to successful regeneration of the species range from competing vegetation and mammals on the mesic sites to extreme drought and heat on the xeric southerly exposures in northern California and southern Oregon. Recent reports on Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, by Ferrell and Woodard (1), Pharis and Ferrell (8), and Zavitkovski and Ferrell (11, 12) describe studies that demonstrated differences by seed source of response to drought stress of Douglas-fir seedlings under laboratory and greenhouse conditions. Our study was undertaken to determine whether planting stock raised from seed collected from mesic and xeric sites would demonstrate a differential survival under drought stress. And, further, to determine whether such survival differences were correlated with definite seedling parameters. Close