This research investigated an economic component of harvesting operations not previously studied for steep-slope thinning harvests in Douglas-fir (Pseudotsuga menziesii) stands in the Pacific Northwest. Of interest was the influence of allowable log lengths and the effect on revenues with a bucking-to-value strategy. Resulting log lengths influence revenues and logging costs important to forest managers, logging contractors, and mill managers. Here, a reduced set of log lengths was evaluated that approaches computer-generated optimal values and creates the potential for development of a bucking decision tool having the form of a bucking pattern cutting card. The reduced set of five log lengths (two mill-length logs and three woods-length logs resulting from combinations of the mill-length logs) was also compared with the full set of allowable lengths for value recovery and fiber utilization. Resulting values were 96 and 98 percent of full-set optimal values for 45- and 65-year-old stands, respectively. Value recovery exceeds that with current unaided bucking practices. The resulting bucking patterns can be easily incorporated into a cutting card based on length to merchantable top. This approach reduces the number of logs handled, increases mill-preferred long logs, decreases pattern count, and increases recovered value. Potential value gains of $4.09 to $8.80 per 100 cubic feet for the two stands are discussed with respect to mill constraints. Use of a combinatorial heuristic is suggested for matching produced logs to mill purchase orders. The board foot–to–cubic foot ratios used for the cubic foot–based analysis are also discussed.
Contributor Notes
The authors are, respectively, Research Forest Engineer and Lematta Professor of Forest Engineering, Forest Engineering, Resources and Management Dept., Oregon State Univ., Corvallis (steve.pilkerton@oregonstate.edu, loren.kellogg@oregonstate.edu). This paper was received for publication in February 2011. Article no. 11-00021.