林分密度对油松中龄林生长特征的影响  

Effect of Stand Density on Growth Characteristics in Middleaged Pinus tabulaeformis Forest

作　　者：郭晓东[1] 常建国[1] 孙向宁[1] 孙拖焕[1] 

机构地区：[1]山西省林业科学研究院,山西太原030012

出　　处：《山西林业科技》2015年第1期8-10,共3页Shanxi Forestry Science and Technology

基　　金：山西省科技攻关项目(20120311014-2)

摘　　要：以平顺县和太原东山25年生的油松人工林为调查对象,通过样地调查,研究林分密度对树高、胸径、枝下高和冠幅等生长特征的影响,以及生长特征指标之间的相互影响。结果表明,林分密度对树高无显著影响,枝下高随林分密度的增大而增大,冠幅、胸径均与林分密度呈显著负相关关系;林分密度为950株/hm2时,树高、胸径、枝下高和冠幅之间相关性均不显著;林分密度为3 050株/hm2时,胸径与树高、胸径与冠幅、冠幅与枝下高显著相关;林分密度为5 600株/hm2时,胸径与树高、冠幅、枝下高,树高与冠幅、枝下高及冠幅与枝下高间均显著相关。The 25a Pinus tabulaeformis plantations were investigated in Pingshun county and Dong Mountain, the effect of stand density on tree height, DBH, height under branch and crown width and influence among growth characteristics were analyzed by sample plot invesigation. The results showed that the density had no significant effect on tree height, height un- der branch increased with density, crown width and DBH were negative correlation with density. There was no significant re- lationship between DBH, tree height, height under branch and crown width at the density of 950 stubs/hm^2. There was a significant correlation between DBH and height, height under branch and crown width, DBH and crown width at the density of 3 050 stubs/hm^2. DBH were significantly correlated with tree heitght, crown width and height under branch, tree height were significantly correlated with crown width and height under branch, crown width was significantly correlated with height under branch at the density of 5 600 stubs/hm^2.

关 键 词：油松 林分密度 树高 胸径 枝下高 冠幅 

分 类 号：S758.5[农业科学—森林经理学]