Les forêts de feuillus tolérants fournissent une vaste gamme de produits, notamment des billes dont la valeur varie de 45 à 1700 $/m3. L'utilisaton de modèles de production convenant aux produits de commodité ne maximise pas la valeur qu'on peut tirer de ce type de forêt.
Many companies and their contractors must adapt to the reality of integrating harvesting with the sorting of multiple products. This separation of products can be performed at several stages during harvesting. This Technical Note combines the results of published and unpublished studies to describe the advantages and disadvantages of separating two or more products with the various machines used in full-tree, tree-length and cut-to-length harvesting systems. The cost of separating six products is simulated for three different harvesting systems.
With the increasing number of products that must be separated in the forest, it’s becoming increasingly important to carefully evaluate the impact of sorting on the productivity of forestry machines. As well, the assortment of log products is becoming increasingly diverse, with log lengths ranging from 2.5 m (8 ft) to 7.3 m (24 ft). This report summarizes the results obtained thus far by FERIC in terms of the impact of log lengths and of the number of products to separate on the productivity of cut-to-length harvesting machines. We developed a productivity model for single-grip harvesters as a function of mean stem volume (m³), the number of products to separate, the use of multi-stem processing, and the mean log length, and another model for forwarders as a function of the payload per trip, the travel speed, the number of products to separate, the mean log length, and the extraction trail length. A cost analysis is also presented that demonstrates, among other things, that the production of short logs has a significant negative impact on costs.
Wood residues that accumulate as sortyard debris have traditionally been burned as waste on-site or landfilled. However, changing environmental or societal expectations mean these options are now unavailable for many areas. Processing the residues into usable products requires machinery and the consumption of fossil fuels, which add to the disposal cost and the amount of carbon dioxide emitted into the atmosphere. This report compares the fuel consumption, carbon balance, and cost of four methods for disposing of sortyard debris.