摘要
基于在黑龙江省孟家岗林场设置的3个密度等级(密度Ⅰ<400株/hm2、500株/hm2<密度Ⅱ<600株/hm2、密度Ⅲ>800株/hm2)落叶松人工林标准地的30株解析木数据,研究林分密度对节子和干形的影响。结果表明:节子直径随林分密度的增大而减小,最大节子出现的位置随林分密度的增大逐渐提高,健全节长度随着林分密度的增大而减小;健全节在低于树高40%的部分随着树木相对高度的增加逐渐增长,在树高的40%以上健全节长度逐渐递减;枝条寿命和枝条死亡后被包藏的时间随着密度的增大而减小;密度对树木干形影响较大,密度小的林分干形质量差,几种干形指标分析树木干形结果表明这些指标可以很好的描述树木干形的变化情况,虽然低密度林分生长量大,树木的胸径较大,但是干形比较差,节子也较大,导致木材质量的降低。
An experiment was conducted to study the influence of different stand densities （ less than 400 individuals/hm^2,500 ～ 600 individuals/hm2,greater than 800 individuals/hm^2） on knot and stem form of larch in accordance with the observational data of 30 trees in six sample plots in larch plantation in Mengjiagang Forest Farm,Heilongjiang Province. Results show that,with stand density increasing,knot diameter decreases,the occurrence position of the biggest knot in the branches becomes higher,and sound knot length decreases. With the increase of relative tree height,the sound knot length increases under the height of 40% of tree height,but it decreases above the height of 40% of tree height. The lifespan and hidden period of the branches after death decrease with increasing stand density. Influence of stand density on stem form is obvious,and the quality of stem form of larch in low-density stand is bad.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2010年第6期4-8,共5页
Journal of Northeast Forestry University
基金
国家"十一五"林业科技支撑计划课题(2006BAD24B06)资助
