不同树枝级别和直径胡桃枝材的木射线物理形态表征

Physical Morphology Characterization of the Xylem Ray of Juglans regia Branches with Different Levels and Diameters

本文以河南省经济林胡桃树枝为研究对象,采用数字成像系统对解剖特征拍照,使用木材显微构造测量系统测量其木射线组织物理形态及指标,并分析了不同树枝直径和树枝级别木射线物理形态的差异。结果表明:胡桃枝材木射线类型为单列木射线和多列木射线。射线细胞类型有同型单列、同型多列、异型单列、异型Ⅲ型。木射线高度、宽度平均值分别99.54μm、14.20μm,射线细胞长度、高度、壁厚平均值分别为25.72μm、9.07μm、1.70μm。胡桃枝材的木射线各指标在树枝级别间均差异显著,其中三级枝的枝材整体木射线尺寸最小。树枝直径与胡桃枝材射线细胞长度、射线细胞壁厚、木射线宽度呈正相关,与射线细胞高度呈负相关。

In this paper,branches of Juglans regia in Henan Province were taken as the research object.The anatomical characteristics were photographed by digital imaging system,and the physical morphology and indexes of xylem ray parenchymas were measured by wood microstructure measuring system.The differences of the physical morphology of the xylem ray of branches with different diameters and levels were analyzed.The results showed that there were uniseriate rays and multiseriate rays.The ray cell types were homogeneous uniseriate rays,homogeneous multiseriate rays,heterogeneous uniseriate rays and heterogeneous type III rays.The average height and width of the ray were 99.54μm and 14.20μm.The average length,height,and wall thickness of the ray cell were 25.72μm,9.07μm and 1.70μm.The ray indexes of branches were significantly different among different branch levels,and the ray size of the tertiary branch was the minimum.The branch diameter was positively correlated with the ray cell length,the ray cell wall thickness,and the ray width of the branch,while it was negatively correlated with the ray cell height.