| 云南松木纹扭转变化规律的探讨 |
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| 引用本文： | 晏一祥,李尹. 云南松木纹扭转变化规律的探讨[J]. 云南大学学报(自然科学版), 1988, 0(3) |
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| 作者姓名： | 晏一祥 李尹 |
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| 作者单位： | 云南大学生物系(晏一祥)，云南省林校(李尹) |
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| 摘 要： | 以往的文献报道,斜纹理多发生在过熟林木中,幼林内不甚普遍。我们在滇东南削皮调查4108株云南松的木纹理,发现幼林普遍扭转,林分平均扭转度大,过熟林中扭转木少,林分平均扭转度小。引起这种变化的因素有两个,一是有些轻度扭转木在生长过程中随茎干增粗而逐渐变直,二是在自然选择过程中扭转度大的个体被淘汰得多。
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| 关 键 词： | 云南松 木纹理 扭转 林分 |
STUDIED ON THE CHANGED LAW OF THE WOODEN GRAIN TWIST OF THE PINUS YUNNANENSIS FRANCH |
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| Yan Yixiang. STUDIED ON THE CHANGED LAW OF THE WOODEN GRAIN TWIST OF THE PINUS YUNNANENSIS FRANCH[J]. Journal of Yunnan University(Natural Sciences), 1988, 0(3) |
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| Authors: | Yan Yixiang |
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| Abstract: | We investigated wooden grain of 4108 Pinus yunnanensis Franck and found that young trees twist generally. The mean-value of the twisted degree of the young forest is higher. Twisted trees are less in the mature forest. The mean-value of the twisted degree of the mature forest is lower. There are two factors which cause this change. The first factor is that some slightly twisted trees gradually change into straight trees along with the increase of the stem in process of growing. The second factor is that intensely twisted individuals are more eliminated as compared with the straight individuals in the natural selection. |
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| Keywords: | Pinus yunnanensis wooden grain torsion standing forest |
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