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首页> 外文期刊>Wood and Fiber Science >Variability of wood color in paper birch in Quebec.
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Variability of wood color in paper birch in Quebec.

机译：魁北克桦木木材颜色的变异性。

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摘要

Color variability of paper birch (Betula papyrifera Marsh.) wood at the tree level was examined in this article. Tree age, dimension, and vigor were expected to influence the proportion of discolored wood in paper birch boards; older, larger, and less vigorous trees were assumed to produce boards with higher proportions of discolored wood. The color analysis was performed on approximately 2250 boards produced from 168 paper birch trees harvested in two different stands from which only logs of sawing quality were used. An industrial scanner was used to digitize the boards and obtain colorimetric information. Results show that tree diameter and vigor significantly influenced the proportion of discolored wood in boards, whereas the effect of tree age did not have a significant influence in the model. An average area of 32.4% of discolored wood was obtained when considering all boards. Less vigorous trees showed a mean area of 45.32%, whereas middle-vigor and most-vigorous trees had mean areas of 30.78 and 15.47%, respectively. The colorimetric values were mainly affected by tree age and diameter, but these effects were variable for every colorimetric parameter. The analysis of the random effects demonstrated that most of the total random variance of the dependent factors came from the between-board, between-tree, and, to a lesser extent, between-log variation. These findings suggest that favoring shorter rotations would help produce trees with lower proportions of discolored wood.
机译：本文研究了桦木（Betula papyrifera Marsh。）木材在树水平上的颜色变化。预计树木的年龄，大小和活力会影响桦木纸板中变色木材的比例。假定使用较老，较大和较不活跃的树木生产的木板变色比例更高。颜色分析是在大约2250块木板上进行的，这些木板是从168个白桦树中收获的，分别在两个不同的架子上采伐，仅使用锯木质量。使用工业扫描仪将板数字化并获得比色信息。结果表明，树木的直径和活力显着影响木板中变色木材的比例，而树木年龄的影响对模型没有显着影响。当考虑所有板材时，平均面积的变色木材为32.4％。强度较小的树木的平均面积为45.32％，而中度活力的树木和强度最大的树木的平均面积分别为30.78和15.47％。比色值主要受树龄和树木直径的影响，但是这些影响对于每个比色参数都是可变的。对随机效应的分析表明，因果关系的总随机方差中的大多数来自板间，树间以及对数间变化，而程度较小。这些发现表明，有利于更短的旋转将有助于减少树木变色比例。

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