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首页> 外文期刊>Wood and Fiber Science >Effects of cambial age and stem height on wood density and growth of jack pine grown in boreal stands.
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Effects of cambial age and stem height on wood density and growth of jack pine grown in boreal stands.

机译：冈比亚年龄和茎高对北方林分生长的杰克松的木材密度和生长的影响。

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摘要

Jack pine specimens were examined for longitudinal and radial variations in selected wood quality parameters. Wood density and ring width of cross-sections were measured systematically from pith to bark along the merchantable stem using X-ray densitometry. Effects of cambial age and stem height were analyzed using a linear mixed model with two levels of nesting. A strong interaction between the two factors was found in corewood. Tree individual variation increased with cambial age for all studied wood properties and was larger in earlywood than in latewood. Radial patterns in the studied parameters closely approximated published ones in the lower stem but lessened considerably with increasing stem height. By contrast, longitudinal patterns reversed with cambial age in earlywood. High coordination was found between longitudinal patterns in corewood and radial patterns in the stem base, indicating a similar maturation pattern in the apical meristem and cambia. However, with increasing cambial age, this high coordination disappeared rapidly.
机译：在选择的木材质量参数中检查了杰克松木试样的纵向和径向变化。使用X射线密度计系统地测量了沿可交易茎从髓到树皮的木材密度和截面的环宽。使用具有两个嵌套级别的线性混合模型分析了冈比亚年龄和茎高的影响。在芯材中发现了两个因素之间的强相互作用。在所有研究的木材特性中，树木个体变异都随着冈比亚年龄的增加而增加，早木比晚木更大。所研究参数中的径向模式与下部茎中的已公布参数非常接近，但随着茎高的增加而显着减小。相比之下，早材的纵向样式随着年龄的增长而反转。在芯材的纵向模式和茎基部的径向模式之间发现了高度的协调性，表明在顶端分生组织和Cambia中具有相似的成熟模式。但是，随着冈比亚年龄的增加，这种高度协调性很快消失了。

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