Effects of Alternative Silvicultural Treatments on Cable Harvesting Productivity and Cost in Western Washington

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Abstract:

Increasingly, alternative silvicultural methods have been considered to meet the demand for nontimber values such as visual quality and biodiversity in the Pacific Northwest. The successful implementation of these alternative silviculture treatments requires careful consideration of economics and operational efficiencies in timber harvesting. This study used detailed time study and shift-level data to assess the effect of alternative silvicultural treatments on the production and cost of cable harvesting in western Washington. Four silvicultural treatments were examined: clearcut, two-age, patch cut and thin, and group selection. Silvicultural treatments greatly affected the production and cost of timber harvesting, especially in felling and yarding processes. The average yarding cycle time (3.74 minutes/cycle) in the clearcut unit was shorter than those in other partial cutting treatment units because there were no residual trees to work around and higher harvest volumes per acre, compared with the partial cut units. The average tree size greatly affected yarding cost: the clearcut unit had the second-highest yarding cost ($52.38/thousand board feet [mbf]) because of the smallest piece size (69.6 board feet/piece). Stump-to-truck cost for this study ranged from $70.49/mbf for the patch cut and thin to $120.19/mbf for the group selection. Carriage types and yarding direction also had an impact on yarding productivity.

Keywords: alternative harvesting; partial cutting; skyline carriage; skyline yarding

Document Type: Research Article

Publication date: July 1, 2007

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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