摘要
就林分密度对南方型杨树材性的影响进行研究。研究结果表明：①林分密度对各无性系木材的纤维素含量影响规律不明显；②随林分密度增大，纤维长度有所增长，各级纤维频率趋于均匀，林分密度对纤维宽度与长宽比影响不显著；③林分密度对Ｓ_２层微纤丝角有显著影响，Ｓ_２层微纤丝角随着林分密度的增大而减少；④木材相对结晶度随林分密度的增大而增大；⑤随着林分密度的增大，木材的冲击韧性降低，而气干密度逐渐增大。在４ｍ×４ｍ、５ｍ×５ｍ和６ｍ×６ｍ株行距的林分中，随林分密度增加其抗弯强度和弹性模量增大。而对木材的抗压强度影响不明显。
The article reported effects of planting density on wood properties for southern type poplars. Results investigated indicated that: (1) the density had no significant effect on cellular content(%) ; (2)closer spacings would cause fibers to be longer. the distribution frequency of fibers tended to be more homogeneous, but planting density did not seriously influence the ratio of fiber length to its width; (3)the density had obvious effects on micro fibre angles of S2 layer, and close specings would make microfibre angles smaller; (4)with increase of planting density, Crl% would be higher; (5) physical and mechanical properties of the wood were significantly influenced by the density, generally speaking, closer spacings got shock toughness decrease, and air dry density increase. Expect spacing 7 m ×7 m, the density would increase bending strength and elasticity module. Furthermore, planting density has no remarkable influence on crushing strength along the grain.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
1994年第2期41-46,共6页
Journal of Nanjing Forestry University：Natural Sciences Edition
关键词
南方型杨型
林分密度
木材性质
Southern type poplars
Stand density
Cellulose content and fibre size
Microfibre angles and Crl%
Physical and mechanical properties
