不同树龄尾巨桉无性系人工林木材纤维形态变异分析  

Variation of Wood Fiber Morphology of Eucalyptus urophylla×E.grandis Clone Plantation at Different Ages

作　　者：甘春雁[1] 吕曼芳 李昌荣[1] 邓紫宇[1] 周维[1] 谢春俊 Gan Chunyan;Lyu Manfang;Li Changrong;Deng Ziyu;Zhou Wei;Xie Chunjun(Guangxi Forestry Research Institute,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Key Laboratory of Central South Fast-growing Timber Cultivation of National Forestry and Grassland Administration,Nanning,Guangxi 530002,China;Guangxi State-owned Weidu Forest Farm,Laibin,Guangxi 546100,China;Guangxi State-owned Sanmenjiang Forest Farm,Liuzhou,Guangxi 545000,China)

机构地区：[1]广西壮族自治区林业科学研究院,广西优良用材林资源培育重点实验室,国家林业和草原局中南速生材繁育实验室,广西南宁530002 [2]广西壮族自治区国有维都林场,广西来宾546100 [3]广西壮族自治区国有三门江林场,广西柳州545000

出　　处：《广西林业科学》2020年第2期270-275,共6页Guangxi Forestry Science

基　　金：广西创新驱动发展专项资金项目(桂科AA17204087-6);中央财政林业科技推广示范项目([2019]TG21号)。

摘　　要：为探究不同树龄尾巨桉无性系(Eucalyptus urophylla×E.grandis)人工林木材纤维形态特征的差异,以广西国有维都林场5年生和7年生尾巨桉无性系人工林木材为研究对象,采用解析木取样方法,对两个树龄尾巨桉无性系木材的纤维长度、宽度、腔径和双壁厚进行测定,分析其木材纤维特性。结果表明,5年生和7年生尾巨桉无性系木材纤维的平均长度分别为956.71和958.36μm,平均宽度分别为20.26和20.65μm,平均腔径分别为13.29和13.08μm,平均双壁厚分别为6.97和7.57μm,平均长宽比分别为47.32和46.48,平均壁腔比分别为0.54和0.59。由树干根部至梢部,木材纤维长度呈先增大后减小的趋势,宽度呈逐渐减小的趋势,双壁厚表现为5年生缓慢增大、7年生上下波动;自髓心向树皮,纤维长度、宽度和双壁厚均呈逐渐增加的趋势。方差分析表明,5年生尾巨桉无性系木材不同年轮间纤维长度、宽度和双壁厚差异均极显著;不同树干高度间纤维腔径差异极显著,其余差异均不显著。7年生尾巨桉无性系木材不同年轮间纤维双壁厚差异不显著,其余均差异极显著;不同树干高度间纤维长度、宽度、腔径和双壁厚差异均不显著。In order to study differences of wood fiber characteristics of Eucalyptus urophylla×E.grandis plantation at different ages,taking 5-year-old and 7-year-old E.urophylla×E.grandis clones in Guangxi stateowned Weidu forest farm as materials,wood fiber length,width,cavity diameter and double-wall thickness were measured by using analytical wood sampling method and wood fiber characteristics were analyzed.Results showed that average lengths of wood fiber of 5-year-old and 7-year-old E.urophylla×E.grandis clones were 956.71 and 958.36μm respectively;average widths were 20.26 and 20.65μm;average cavity diameters were 13.29 and 13.08μm;average double-wall thicknesses were 6.97 and 7.57μm;average ratios of length to width were 47.32 and 46.48;average ratios of wall to cavity were 0.54 and 0.59.From trunk rhizine to tip,wood fiber length increased firstly and then decreased;width decreased gradually;double-wall thickness increased slowly at 5-year-old and fluctuated up and down at 7-year-old.From pith to bark,fiber length,width and double-wall thickness increased gradually.Variance analysis showed that there were extremely significant differences in fiber length,width and double-wall thickness among different ring numbers of 5-year-old E.urophylla×E.grandis clone,and there were extremely significant differences in cavity diameter and no significant differences in others among different tree heights.There were no significant differences in double-wall thickness and extremely significant differences in others among different ring numbers of 7-year-old E.urophylla×E.grandis clone,and there were no significant differences in fiber length,width,cavity diameter and double-wall thickness among different tree heights.

关 键 词：木材学 解析木取样 尾巨桉 纤维形态 变异分析 

分 类 号：S792.17[农业科学—林木遗传育种]