Mountain pine beetle infected over 18 million hectares
Timber harvest in British Columbia reached a record 90 million m3 in 2005 but fell dramatically the following four years to a 25-year low of just over 52 million m3 in 2009.
Reduced demand for lumber in the U.S. market, relatively high manufacturing costs, export tariffs for shipments to the U.S. and deteriorating sawlog quality were the major reasons that consumption of sawlogs declined by over 40 per cent in a relatively short period of time.
Since the bottom in 2009, harvests have gone up thanks to a substantial increase in exports of logs and lumber China. In 2011, harvested volumes reached 70 million m3 or close the average annual harvest before the forests in the Interior of the province were hit by the mountain pine beetle infestation.
The mountain pine beetle has infected just over 18 million hectares of forests and an estimated 710 million m3 of pine trees (53 per cent of all pine volume in the province) are dead or dying.
Over the next three to five years, it is possible for harvest levels to increase in the interior of the province because of the availability of mountain pine beetle-killed trees that need to be utilized before the quality has deteriorated to the point when it can be used only for making pulp or for energy generation, including the manufacturing of wood pellets. Long-term, harvest levels are likely to be approximately 20 per cent below historical levels.
In a recent study by the B.C. government, it was noted that the Annual Allowable Cut (AAC) in four Timber Supply Areas (TSA) in the interior of the province could be reduced by almost 40 per cent by 2020 as compared to the pre-mountain pine beetle AAC. However, the report also discusses opportunities to mitigate the sharp reduction in available supply by:
A. Investing in harvesting and mill equipment able to harvest small-diameter trees in stands that are currently considered being uneconomical.
B. Intensifying silviculture management and increasing stand fertilization.
C. Harvesting in areas currently managed for non-timber values such as biodiversity and wildlife habitat.
The report predicts that by utilizing smaller trees, investing in intensive forest management and harvesting stands managed for non-timber values, future “mitigated-AAC” may be only 10 per cent lower than the pre-mountain pine beetle AAC. This may, of course, never happen, since the public will see the suggested changes in forest management regime as quite controversial.
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Category: British Columbia