4种灌木材微纤丝角及其变异性研究

目的]研究灌木材的微纤丝角及其变异性。方法]采用偏光显微镜法,分析研究内蒙古地区树龄3 a以上沙柳、柠条、红柳、沙棘的微纤丝角及其变异性,并用碘染色法进行验证试验。结果]沙柳、柠条、红柳、沙棘灌木材的平均微纤丝角分别为11.09°、8.08°、7.84°、6.91°,与同龄阔叶树材相比角度偏小。红柳纤丝角的株内径向变异规律为从髓心到树皮逐渐减小,株内纵向变异规律为由根部到梢部逐渐减小,根部、中部、梢部纵向不同部位微纤丝角的均值、标准差和变异系数均存在明显差异。结论]该研究为灌木材的开发利用及遗传改良提供了理论依据。

Study on the Microfibril Angle in Four Species of Shrubs and Its Variability

Objective] The research aimed to study the microfibril angle in shrubs and its variability.Method] The polarizing optical microscope method was used to analyze the microfibril angle of Salix psammophyila,Caragana microphylla,Tamarix ramosissima and Hippophae rhamnoides L.with the tree age of more than 3 a in inner mongolia area and the verification test was made by using iodine staining method.Result] The average microfibril angle in shrubs of S.psammophyila,C.microphylla,T.ramosissima and H.rhamnoides were 11.09°,8.08°,7.84° and 6.91° resp.,which were smaller than that in hardwoods with the same tree age.The radial variation law of microfibril angle in the plant of T.ramosissima was that it was gradually decreased from pith to bark and the longitudinal variation law of microfibril angle in the plant of T.ramosissima was that it was gradually decreased from root to shoot.The mean,standard deviation and variation coefficient of microfibril angle all had obvious differences among different longitudinal parts including root,middle parts and shoot.Conclusion] The research provided the theoretical basis for the development,utilization and the genetic improvement of shrubs.