摘要
研究表明,14年生桤木人工林的木材性状,由髓心至树皮,在生长轮间存在着明显的变异性.木材密度的径向变异为"波动渐高型";纤维长度随轮龄递增,开始时的增加速度较慢,9a后的增加速度加快,径向呈递增稳定的形式,其径向变异模式归于panshinII类型;生长轮宽度在1～7a中呈现出逐渐上升的趋势,7轮之前在某一范围内波动,并在7年生时达到最大值,之后逐渐下降.
The results show:the radial variation pattern of wood characteristics is affected by the age. Wood basic density decreases from pith to the 4^(th) ring,then increases gradually and levels off after the 4^(th) ring to bark in radial direction.Fiber length increases slowly at young stage,then increases rapidly after the 9^(th) ring to bark in radial direction.The ring width increases gradually from pith to the 7^(th) ring,then comes up to the maximum when the age of tree is about 7 years and then decreases in radial direction.
出处
《河南农业大学学报》
CAS
CSCD
2004年第4期400-404,413,共6页
Journal of Henan Agricultural University
基金
"八五"
"九五"国家科技攻关专题(96-014-03-01)
世界银行资助项目(FRDPP).
关键词
桤木
人工林
木材性质
径向变异模式
Alnus crematogyne
plantation forest
wood
radial variation pattern
