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首页> 外文期刊>Berichte des Meteorologischen Institutes der Universitat Freiburg >Wood degradation after windthrow in a northern environment
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Wood degradation after windthrow in a northern environment

机译：北方环境中风后木材退化

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摘要

Severe windthrows often require special salvage operations that lead to increased costs and re-duced product value. In northern environments, the cold climate could contribute to slower ratesof wood degradation and provide a wider window for salvage logging. The study was conductedin northeastern Quebec (Canada), in a severe windthrow which occurred in 2006 in a regionalready touched by partial windthrow in 2003. Logs from the damaged area were collected fortwo species: Abies balsamea and Picea mariana. Logs were obtained from three classes of deg-radation based on visual estimates and from living trees. Each log was sawn and one piece oflumber was selected from each to determine MOR, MOE and visual grade. The exact time ofmortality was determined through dendrochronology. Results show that the visual grade ofPicea lumber from trees that died one or two years before sampling was comparable to thatfrom living trees. Some degradation was seen for trees that died 3-4 years before sampling andincreased thereafter. Degradation of Abies wood properties was faster. MOE was not reduceduntil 6 years after windthrow. MOR decreased after 3-4 years in Picea but no effect could bedetected in Abies, due to a huge variation.
机译：严重的抛掷经常需要特殊的打捞作业，这会导致成本增加和产品价值下降。在北部环境中，寒冷的气候可能会导致木材退化的速度降低，并为打捞伐木提供更大的窗口。这项研究是在魁北克东北部（加拿大）进行的一次严重风吹，该风吹发生在2006年的一个区域，该区域已于2003年被部分风吹触及。从受损地区收集的原木有2种：冷杉（Abies balsamea）和云杉（Picea mariana）。从视觉估计的三类消光辐射和活树中获得原木。锯切每块原木，并从每块中选择一块木材来确定MOR，MOE和视觉等级。确切的死亡时间通过树木年代学确定。结果表明，在取样前一到两年死亡的树木中木虱的视觉等级与活树相当。树木在取样前3-4年后死亡，此后有所增加。冷杉的木材性能下降更快。直到风被抛出后6年MOE都没有降低。云杉在3-4年后，MOR下降，但由于变异很大，在Abies中未检测到任何影响。

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