| 油松管胞形态特征的变异 |
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| 引用本文： | 徐有明.油松管胞形态特征的变异[J].林业科学,1990,26(4):337-343. |
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| 作者姓名： | 徐有明 |
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| 作者单位： | 华中农业大学林学系 |
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| 摘 要： | 本文研究分析了山西中条山产地油松管胞形态特征的变异。管胞长度自髓心向外,首先迅速增加,13年后管胞长度增加缓慢,20年后保持相对稳定。管胞长度沿树干主轴自基部向上逐渐增加,5.3m高处最长,然后向上变短,树冠区域管胞长度最短。形成层原始细胞长度随着原始细胞年增大,开始递增,达到最大值后又递减。管胞直径、胞壁厚度自髓心向外增加。管胞直径轴向变化由树干基部开始向上增大,然后又减小。管胞长宽比、壁腔比的径向变异与管胞长度的径向变异模式相似。生长轮内管胞长度从早材到晚材,开始减小,然后增加,最小值位于早晚材过渡处。
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| 关 键 词： | 油松 管胞 形态特征 变异 |
VARIATIONS IN TRACHEID FORMAL FEATURES OF PINUS TABULAEFORMIS CARR |
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| Xu Youming.VARIATIONS IN TRACHEID FORMAL FEATURES OF PINUS TABULAEFORMIS CARR[J].Scientia Silvae Sinicae,1990,26(4):337-343. |
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| Authors: | Xu Youming |
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| Abstract: | Three trees of Pinus tabulaeformis Carr. were collected from a natural stand of Zhongtiao Mountains in Shanxi Province. From pith outward, the tracheid length first increases rapidly, then increases slowly after 13 years old, and levels off after 20 years old. Along the stem height, the tracheid length increases progressively from the base upward, maximum at 5.3m in height, and then decreases to the top of the tree. The shortest tracheid length was found near the crown of the trees. With augmenting age of formation of the cambial initials, the length of these cambial initials first increases, and then decreases. The tracheid diameter and the thickness of cell wall increase from pith to bark. From the base to the top of the tree, the tracheid diameter increases step by step, then decreases near the top of the tree. The radial variations of the tracheid length-width ratio and tracheid wall thickness-diameter ratio are similar to the variation of the tracheid length. Within a growth ring, the tracheid length decreases gradually from spring wood to summer wood, and then increases quickly. The tracheid length of the spring wood is shorter than that of the summer wood, and the minimum of the tracheid length is at the transitional position of the spring wood and summer wood. |
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| Keywords: | Tracheid length Tracheid diameter Cell thickness Variation Pinus tabulaeformis |
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