秃杉幼林生长对修枝强度的效应  

Effects of Pruning Intensity on the Growth of Young-age Taiwania flousiana Plantations

作　　者：杨锐铣 陈强[2] 苏俊武[2] 孙志刚[2] 段成波 刘永刚[2] 周筑[2] 孙宏[2] 

机构地区：[1]大理农林职业技术学院,云南大理671003 [2]云南省林业科学院,云南昆明650201 [3]腾冲县林业局森林资源管理站,云南腾冲679100

出　　处：《西部林业科学》2015年第6期66-71,共6页Journal of West China Forestry Science

基　　金：林业公益性行业科研专项:秃杉大径材人工培育的关键技术研究(201104053)

摘　　要：以腾冲11年生秃杉幼林为材料,采用不修枝、修枝1/3和修枝1/2等3个处理,研究不同修枝强度对秃杉幼林生长的影响,结果表明:修枝强度增加能促进枝条的恢复性生长,不修枝、修枝1/3和修枝1/2,枝条的增长率分别为9.09%、18.93%和26.86%,但枝顶芽高和枝最低处高下降幅度减少,减弱了树冠向下拓展空间的能力,不修枝、修枝1/3和修枝1/2,其枝顶芽高的下降幅度分别为19.76%、10.56%和5.05%,枝最低处高下降幅度分别为17.33%、5.78%和1.94%。修枝后秃杉林木的高和径生长均有明显下降,且随着修枝强度的增加生长量下降越快,修枝强度为1/3时,1年后树高和胸径生长量分别下降21.29%和18.36%,3年后树高和胸径生长量分别下降8.42%和4.42%;当修枝强度达1/2时,1年后树高和胸径生长量分别下降28.39%和24.15%,3年后树高和胸径生长量分别下降18.68%和9.44%。修枝对林木生长的影响随着修枝后生长时间的延长,生长量下降幅度会有所减弱,但3年后差异仍然明显,因此在秃杉的经营管理中不宜进行高强度的修枝,宜不修或少修,即使要进行修枝,也应采用少量多次的修枝方法。Using 11-year-old Taiwania flousiana as the experimental material, effects of different pruning intensi- ties on its growth were studied. The results showed that pruning intensity promoted the recovery of the growth of branch, the growth rate of the branch increased with the pruning intensity increasing, growth rate of the branch were 9.09 % , 18.93 % and 26.86 % respectively with the pruning intensity of O, 1/3 and 1/2. But increased pruning intensity weakened the ability to expand the space downward of the tree crown, and the height of the top bnd decreasing strength was 19.76 %, 10. 56 % and 5.05 % respectively, the height of the lowest branch was 17.33 %, 5.78 % and 1.94 % respectively with the pruning intensity of 0. 1/3 and 1/2. The height and DBH decreased after pruning, height growth and DBH growth showed an decreasing tendency with the increasing strength of pruning intensity. Compare with the control, tree height and DBH decreased 21.29 % and 18.36 % respective- ly after 1 year later, 8.42 % and 4.42 % respectively after 3 years later by primed with intensity of 1/3, treeheight and DBH decreased 28.39 % and 24. 15 % respectively after 1 year later, 18.68 % and 9.44 % respec- tively after 3 years later by pruned with intensity of 1/2. Effects of pruning on the growth of young-age Taiwania flousiana plantation will disappear while time pass by, but the difference was evident 3 years later. It is recommen- ded that the negative effect of pruning on tree growth must be taken into considered in Taiwania flousiana planta- tions management, non-pruning or lower intensity but more frequent pruning could be taken when it is necessary.

关 键 词：秃杉 修枝强度 林木生长 树冠生长 腾冲县 

分 类 号：S791[农业科学—林木遗传育种]