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BC Bugwood Envirochem Services Inc. Within the coming twenty years, the amount of recoverable sawlogs and chips from bugwood stands will be reduced to very small amounts, whereas, the “non-recovered loss” increases to a very large amount (between 400 and 500 million m3 by 2024). However, as mentioned above, the condition of old bugwood stands deteriorates to a degree that harvesting may become more difficult or even impossible after some time. The shelf life for energy related uses of “non- recovered loss” bugwood is therefore determined by the ability to successfully harvest the wood before it becomes too brittle, falls and rots, or is destroyed by wildfire. Safety concerns due to breaking branches during harvesting can also preclude traditional harvesting techniques and commercial use of such low-value bugwood. Increased breakage during harvesting can pose safety risks in some cases, and results in increased handling costs and less recovery, translating into higher costs. Assuming that, according to Figure 2.1.4, bugwood is no longer harvestable after 15 years and that the resource is reduced by 1/11 each year through decay beginning in the fourth year after a tree dies, Figure 2.1.4 shows the cumulative availability of bugwood expected in the BC Interior. The graph assumes that 35 million m3 of bugwood are harvested between 2005 and 2015, with harvests reduced to pre-epidemic levels by 2016 and further reduced by 19% by 2020. Only the surplus resource (not harvested at current levels) is shown. It becomes obvious that the resource is a very temporary one, peaking in 2011 and then dwindling again to reach fairly low levels by 2020. Initiatives involving new technology or adaptations of existing approaches may require some years to be implemented. This suggests that any approach to utilize the bugwood resource should be gauged to a duration of ten years. However, it is not known whether the pine beetle infestation will continue after 2024. If new pine is being infested after this date, more bugwood will continue to be created, which could continue to be used for sawlogs, chips and energy purposes, albeit in much smaller quantities. 350 300 250 200 150 100 50 0 Figure 2.1.4 Cumulative Availability of Still Harvestable Bugwood Not Expected to Be Harvested at Current and Future Harvest Levels (assuming trees can no longer be harvested 15 years after they die) To manage the bugwood problem, the BC Forest Service has increased the Annual Allowable Cut (AAC) by so-called “uplifts” defined for several Beetle Management Units. Even with the recent uplifts, it is expected that much more bugwood will remain unharvested unless other uses can be found. The Emergency Bark Beetle Management Area is determined on an annual basis using aerial overview information. Ministry surveys indicated the mountain pine beetle affected about seven Page 5 Million m3 of Bugwood 20 00 20 02 20 04 20 06 20 08 20 10 20 12 20 14 20 16 20 18 20 20 20 22 20 24 20 26 20 28 20 30PDF Image | IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS
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