树洞周边愈伤木与正常木的化学组成及物理力学特性的比较

摘要

With the callus wood and the surrounding normal wood of Pinus taiwanensis and Platanus acerifolia, we tested the cel-lulose crystallinity of the callus woods and the surrounding normal woodsby X-ray diffraction spectrum and studied the difference of the main chemical compositions ( cellulose and lignin content ) , physico-mechanical properties ( basic density and axial compression strength) and the anatomy properties.We also analyzed the correlations between the axial compres-sion strength and the main chemical compositions, basic density and cellulose crystallinity.The cellulose crystallinity, cel-lulose and lignin content, basic density and axial compression strength of the callus woods are higher than those of the sur-rounding normal woods with significant difference and the fibre/tracheid cell wall of callus woods is thicker.The larger di-ameter and the shorter length indicate that the wood property index of callus wood is higher than normal wood.The differ-ence between the indexes of the callus woods and the surrounding normal woods is not so significant , but the callus wood plays potential role in the whole structure.Therefore, the reinforcement mechanism is contributed by the callus wood struc-ture.%以黄山松、悬铃木的愈伤木及其附近的正常木为研究对象，采用X射线法测定了结晶度，同时比较分析了其主要化学成分（纤维素和木质素质量分数）、物理力学性质（基本密度、顺纹抗压强度）及部分解剖性质的差异，研究了顺纹抗压强度与主要化学成分、基本密度和结晶度之间的相关性。结果表明：黄山松和悬铃木愈伤木的结晶度、纤维素和木质素质量分数、基本密度、顺纹抗压强度均比正常木的大，差异显著，而且纤维/管胞细胞壁厚、直径大、纤维短，总体表明愈伤木的材性指标比正常木高；黄山松和悬铃木愈伤木与正常木的部分指标相差不是十分明显，但愈伤木在整个结构中起增强作用，表明这一增强机制是由愈伤木的构造贡献的。