3种竹材微纤丝角变异规律研究

应用X线衍射仪技术对3种竹材的微纤丝角变化规律进行研究。结果表明，3种竹材微纤丝角大小顺序为毛金竹（Phyllostachys nigra Munro var.henonis）>金明竹（Phyllostachys bambusoides var.castillonis）>黄纹竹（Phyllostachys vivax cv.huangwenzhu），竹种之间微纤丝角的差异较小，变化范围在9.72°~11.18°之间；3种竹材微纤丝角随着竹龄并无规律性变化，毛金竹的微纤丝角随着竹龄的增加呈现先降低后增加的趋势，而黄纹竹则呈现相反的趋势，金明竹随着竹龄的增加而不断上升。在纵向上，竹材微纤丝角沿竹竿高度方向变化趋势是从基部至上部不断下降，基部至中部降幅较大，从中部至稍部逐渐趋于稳定，变化幅度较小。方差分析结果表明，竹龄对3种竹材的微纤丝角影响均不显著，高度对其影响显著。

Variation of Microfibril Angle in Three Bamboo Species

X-RD technique was adopted to study the variation of the microfibril angle with different ages and heights in three bamboo species.The results showed the order of the angle was Phyllostachys nigra Munro var.henonis>P.bambusoides var.castillonis>P.vivax cv.huangwenzhu,the angle had little differences among 3 species with a range from 9.72°to 11.18°.There was no significant relationship between the degree of the angle and bamboo age.For P.nigra Munro var.henonis,with the increase of bamboo age,the angle presented a trend of increasing first,then decreasing.While for P.bambusoides var.castillonis,it showed an opposite trend,and for P.vivax cv.huangwenzhu,it increased all the time with the bamboo age.On the longitudinal direction,the angle decreased along with the bamboo height direction from the base to the top,in which from the base to the middle,the amplitude of decreasing was significant,while from the middle to the top,it decreased gradually with little change.The statistical analysis showed that bamboo age had no significant influence on the variation degree of the angle among three species.However,the bamboo height had significant influence on the variation degree of the the angle.