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BC Bugwood Envirochem Services Inc. Not only is the phenomenon of bugwood, at this scale, a temporary one, but the limited “shelf life” of the wood once a tree has been killed also poses logistical problems. Note that the actual shelf life of bugwood is not very well established yet and that research is on-going to determine better shelf life parameters. Some trees will still be standing much longer than 15 years (i.e., the assumption that nothing can be harvested after 15 years may be a conservative one). However, additional trees may be lost due to forest fires and windstorms, which will shorten the availability period in addition to the loss of trees that have fallen. The BC Ministry of Forests has modelled the availability of bugwood over time for the 21 affected Timber Supply Areas, using the following four categories: 1. Live Pine: merchantable and susceptible pine that has not been killed by mountain pine beetles; 2. Sawlogs: Dead pine that has been killed recently enough that it is suitable for the manufacture of dimensioned lumber products; 3. Chips: Pine that has been dead long enough that it is no longer suitable for dimensioned lumber products but is still useable for “alternative” products such as pulp, oriented strand board or bio-fuel; and, 4. NRL (Non-recovered loss): Pine that has been dead for so long that it is no longer useable even for alternative products. The last category could still contain material suitable for energy uses but may require technologies that are to be discussed in this report. In Figure 2.1.3, the “Logged NRL” category represents the volume of residue without commercial value that will be logged alongside sawlogs in harvested blocks. This volume must be logged alongside the commercial wood because it will be intermixed with sawlog and chip volume. Likewise, the Logged Chips are considered a by-product of sawlog harvesting, which is assumed to be the primary activity. The harvested sawlogs and chips are harvested within the current Annual Allowable Cut. The dark shaded areas in the graph represent wood that is not harvested under current scenarios, and thus, lost to any commercial use after some time. Figure 2.1.3 Predicted Fate of Bugwood on the BC Timber Harvesting Landbase [BCFS 2005] Page 4PDF Image | IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS
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