五节芒茎秆纤维形态的研究

Research on fiber morphology of Miscanthus floridulus culm

五节芒茎秆是一种优良的纤维原料,为了更好地研究和利用五节芒茎秆,采用光学显微镜和彩色图像计算机分析系统,研究了五节芒茎秆节间和节部纤维形态。结果表明:五节芒茎秆节间纤维长度分布范围为774.99～5 203.33μm,宽度范围为7.96～32.64μm,平均长宽比为121.51,平均腔径为6.49μm,平均壁腔比为2.61,为稍长的厚纤维,从上部往下部长度逐渐增大,细胞壁壁厚逐渐变厚,宽度则没有明显的规律性变化;节部纤维长度分布范围为180.67～1 044.99μm,宽度范围为10.71～37.96μm,平均长宽比为28.64,平均腔径为5.17μm,平均壁腔比为3.10,为甚短的厚纤维,长度、宽度和壁厚从上部往下部呈现的规律性不明显。比较五节芒茎秆节间与节部的纤维形态,前者较后者纤维长度更长,宽度和细胞壁壁厚更小,节间为较好的非木质人造板的纤维原料,节部稍差。

To better use the Miscanthus floridulus culm as a high quality fiber-material,the fiber morphology of internode and stem node of M.floridulus culm was studied with optics microscope and multicolor image processing software system.Results showed as follows：The range of fiber in internode was from 774.99 to 5 203.33 μm in length,from 7.96 to 32.64 μm in width,and the average ratio of length to width was 121.51.The average in-diameter of fiber was 6.49 μm,and the ratio of thickness of cell-wall to in-diameter of fiber was 2.61.The fiber morphology in internode of M.flridulus was belong to longish and thick fiber rang,the length of fiber and the thickness of cell-wall was gradually decreased from the top to bottom.However,the width of fiber has no obvious regularity.The range of fiber in stem node was from 180.67 to 1 044.99 μm in length,from 10.71 to 37.96 μm in width,and the average ratio of length and width was 28.64.The average in-diameter of fiber was 5.17 μm,and the ratio of thickness of cell-wall to in-diameter of fiber was 3.10.The fiber morphology in stem node of M.flridulus was belong to very short and thick fiber rang,the length and width of fiber and the thickness of cell-wall have no obvious regularity from the top to bottom.Compare the fiber morphology of internode with the fiber morphology of stem node,the former was longer in fiber length and smaller in fiber width and the thickness of cell-wall.As a result,the fiber morphology of internode was better than the fiber morphology of stem node and was better for non-wood based panels.