毛竹维管束的截面形态及变异规律

Variation and Morphology of Vascular Bundle in Moso Bamboo

竹材由维管束和基本组织组成,维管束是其主要承重单元,也是连接微观到宏观性能的重要环节。利用激光共聚焦显微(LCSM)技术准确地测定毛竹不同部位维管束面积,并研究内、外层维管束的面积变异规律。结果表明:毛竹维管束的面积为0.0383～0.2462mm2;毛竹维管束从竹青到竹黄按截面形态可分成内层和外层,两部分差异明显;外层维管束面积随维管束形态的增大大体呈增加趋势,而内层维管束面积变化趋势不明显。

Bamboo culm consists of vascular bundles and parenchyma, and vascular bundles determine mainly the strength of a bamboo culm. Vascular bundle is also an important connection of the microscopic properties and the macroscopic properties of bamboo culm. This paper accurately measured the area of a Moso bamboo （Phyllostachys edulis） vascular bundle by using the Confocal Laser Scanning Microscope（LCSM）, and studied the area variation of inner and outer vascular bundles. The results showed that the area values were between 0.038 3 and 0.246 2 mm^2; the vascular bundles could be divided into outer layers and inner layers according to morphology from outside to inside of bamboo wall; the area of the outer vascular bundle increased with the increasing size, while inner vascular bundle had no change.