云南4种典型材用丛生竹宏观解剖结构与主要物理力学性质的关系

对云南４种典型的材用丛生竹（龙竹Ｄｅｎｄｒｏｃａｌａｍｕｓｇｉｇａｎｔｅｕｓ，甜龙竹Ｄｅｎｄｒｏｃａｌａｍｕｓｂｒａｎｄｉｓｉ，黄竹Ｄｅｎｄｒｏｃａｌａｍｕｓｍｅｍｂｒａｎａｃｅｕｓ，油勒竹Ｂａｍｂｕｓａｌａｐｉｄｅａ）的维管束密度、纤维比量、密度、含水率、干缩率、顺纹抗压强度和弦向抗弯强度的检测结果认为：４种竹材之间和同一竹种内径向、弦向和纵向上的结构和物理力学性质的分布存在着较大的差异。对结构指标与主要物理力学性质之间关系的分析结果认为：纤维比量比维管束密度与竹材物理力学性质的关系更为密切；４种竹材的纤维比量与密度、弦向抗弯强度和顺纹抗压强度呈正比关系，与饱湿含水率呈反比关系。

RELATIONSHIPS BETWEEN THE TEXTURES AND MAIN PHYSICAL AND\=MECHANICAL PROPERTIES OF FOUR TYPICAL THICK\|GROWING\=STRUCTURAL BAMBOOS IN YUNNAN \=\=

Results from the measurements of vascular bundle density and fiber coverage, and the tests of density, moisture content, shrinkage, tangential bending strength and longitudinal compressive strength showed that the textures and physical and mechanical properties of four typical thick\|growing structural bamboos in Yunnan, \%Dendroncalamus giganteus, D.brandisii, D. membranaceus\% and \%Bambusa lapidea\%, are quite different from not only among the species but also the positions within a bamboo pole along the radial, tangential and longitudinal directions. Compared with the vascular bundle density, the fiber coverage should be more appropriate to reflect the relationships between the textures and the physical and mechanical properties of the bamboos. It was found that the relationships between the fiber coverage and density, tangential bending strength and longitudinal compressive strength are direct, but the relationship between the fiber coverage and the full moisture content is inverse.