麻竹材基本密度与力学性质变异规律的研究

通过对不同立地条件、不同年龄、竹竿不同部位麻竹材基本密度和力学性质的测定和分析，结果表明：影响麻竹材基本密度和力学性质因素的重要程度为竹竿部位＞年龄＞立地条件；竹竿部位和年龄对麻竹材基本密度和力学性质影响均极显著，立地条件对麻竹材基本密度、顺纹抗压强度和弦向冲击韧性影响极显著，对麻竹材弦向抗弯强度和顺纹抗剪强度影响不显著。麻竹材基本密度和力学性质表现为：上部＞中部＞下部，随立地条件高而减小，随年龄增大而提高，麻竹材作为结构用材的适宜采伐年龄为4～5年。

Study on the Variation Pattern of Basic Density and Mechanic Properties of Dendrocalamus latiflorus timber

Basic densities and mechanic properties of Dendrocalamus latiflorus Munro timber in different sites,age and positions of culm were determined and analysed. The resultsshowed that the degree to which each factor affected its basic density and mechanic propertywas as follows: the first was Position, the second Age, and the third Site. The position ofculm and age affected the basic density and mechanic properties more significantly. Site conditions had a very significant affect on basic density, compression strength parallel to grainand impact strength of tangent, but not on bending strength of tangent and shearingstrength parallel to grain. Basic density and mechanic property of D. latiflorus at various positions were upper>middle>lower, and they had reverse relation with site conditions, butpositive relation with age. Optimal cutting age for building timber of D. latiflorus was 4-5years old.