| dc.description.abstract | Wood fibre recovery levels of harvesting systems have increased steadily since
the advent of mechanized logging in northwestern Ontario. Although wood utilization
levels are commonly better than the legal specifications there remains room for
improvement. Better knowledge of wood utilization levels can lead to a more efficient
choice of harvesting systems and/or the improvement of elements within given
harvesting systems. More efficient harvesting systems can be used to meet management
goals of lower wood costs, greater fibre recovery, and/or less extensive cutting. The
objectives of this study were to: I) determine the relative amounts of wood fibre
recovery of various harvesting systems currently being employed in northwestern
Ontario, 2) quantify die amount of waste wood produced at each elements of those
harvesting systems, and 3) determine the overall economic impact of achieving better
recovery.
Sampling of wasted wood fibre from each element of three common harvesting
systems; full-tree chipping (FT-CH), full-tree to roadside with shortwood to mill (FT-
SW), and cut-to-Iength (CTL), occurred over two summers o f typical operations.
Detailed models of fibre recovery were developed for these three harvesting systems. As
well, logical extrapolations were used to develop a fibre utilization model for a fourth
system; full-tree to roadside with tree-length to mill (FT-TL). A wood flow analysis was
conducted on a case study area using a raster based geographic information system.
Results indicate that the most efficient systems in terms of fibre recovery are the FT-CH
and the CTL system. The geographic wood flow analysis revealed that significantly less
area would be required to be harvested if more efficient harvesting systems were used.
Marginal cost analysis revealed that the CTL system should not be used to replace the
FT-SW system. Slight reductions in the cost of the CTL system would, however, make
the system more cost advantageous in the long term. | |
