杨树无性系木材纤维长度和宽度的株内变异  

Variation of Fiber Length and Fiber Width for Seven Poplar Clones

作　　者：杨文忠 方升佐[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2003年第6期23-26,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金资助项目(30070616)

摘　　要：对7个杨树无性系纤维形态的测定研究表明,前6,8,11年内7个无性系纤维长度在胸径处的变异不显著,最大的I 69杨比最小的95杨纤维长度增加了6.6%。纤维长度和宽度在7个无性系中从髓心到树皮的径向变异均表现为显著增加,但宽度增加没有长度增加显著。纤维形态在株内纵向变异规律为:纤维长度在同一年轮内不同高度间的变异均是树干基部较小,随树高的增加纤维长度逐渐增加,树高增加到5.6m后纤维长度达到最大,随后波动较小,至17.6m又开始下降;纤维宽度在树干基部到3.6m的范围内较大,而超过3.6m后开始减小。回归分析表明,纤维长度与年轮及树干高度的关系可用多项式描述。树木生理年龄是影响纤维形态的一个主要因子。The fiber length(l) and width of 7 poplar clones were measured and studied in this paper.It shows there are no significant differences in variation of fiber length at breast height in 6,8,and 11 years old among 7 poplar clones.The order of fiber length is lI69>lI72>lNL895>lNL1388>lNL447>lNL351>lNL95 among 7 poplar clones of 11 years old.The fiber length of I69 is 6.6% longer than NL95 within 11 years old.Fiber length and fiber width gradually increase from pith to bark,but fiber width variation is not so remarkably like fiber length.Within a single tree fiber length is the shortest at the base of trees and increases from base to peak,and it reaches the longest at above 5.6 m within the tree.After maintaining stabilization to 17.6 m it starts to declines within a single tree.The mean fiber width is the widest within 3.6 m,but it will decrease above 3.6 m in a single tree.The notable linear,polynomial,index and power relationship exist between fiber length and growth rings.And linear,polynomial,index regression mainly exist between fiber length and tree height.But the physiological age would affect fiber shape trait in poplars.

关 键 词：杨树无性系 木材纤维 长度 宽度 变异 髓心 树皮 高度 年轮 树木 生理年龄 

分 类 号：S718.47[农业科学—林学]