摘要
为探讨不同造林密度对峦大杉人工林林分生长形质及林分分化的影响,选用福建武平8年生不同造林密度(2 700、3 000、3 300、3 600株·hm-2)峦大杉人工纯林为研究对象,对林分生长形质及林分分化等系列性状指标进行调查分析,并应用主成分分析法进行综合评价。结果表明:造林密度显著影响着峦大杉平均树高、胸径、冠幅、单株材积、林分蓄积等5个生长性状;造林密度显著影响着峦大杉的圆满度、冠长率、高径比、枝下高、胸高形数等5个形质性状;造林密度显著影响着峦大杉相对胸径的变异系数和Ⅱ、Ⅲ级木以下株数比例,表明峦大杉生长形质及林分分化有着显著的造林密度效应。随造林密度的增大,峦大杉的平均树高、胸径、冠幅、冠长率、单株材积均呈现逐渐降低的变化规律、表现出抑制效应;而林分蓄积、树干圆满度、高径比、枝下高、胸高形数等形质指标以及相对胸径的变异系数,Ⅱ、Ⅲ级木以下株数比例等林分分化指标均呈现逐渐升高的变化,表现出促进效应。造林密度对峦大杉的造林保存率、树干通直度、尖削度无显著影响。造林密度显著影响峦大杉综合得分值,表明合理造林密度的必要性。综合8年生峦大杉生长形质以及林分分化情况,造林密度2 700株·hm-2的峦大杉总体生长表现最好,有利于峦大杉大中径材的培育,并适时间伐、抚育。
For studying the effect of the different planting densities on the growth,form quality and stand differentiation of young Cunninghamia konishii plantation,an investigation on the growth,form quality and stand differentiation was conducted in 8-a C. konishii plantation with different planting densities（ 2 700,3 000,3 300,and 3 600 tree·hm^-2） in Wuping County,Fujian,China,and the comprehensive evaluation of the different planting densities was conducted by the principal component analysis method. The planting density significantly affected five growth indices,including height,DBH,crown width,individual volume and stand volume,significantly affected five form quality indices including stem fullness,crown length ratio,diameter height ratio,branch height,the breast height form factor,and significantly affected three stand differentiation indices including the relative DBH variation coefficient and the number ratio of below grade II and III wood,which showed there were significant planting density effect on growth,form quality and stand differentiation of C. konishii plantation. The average height,DBH,crown width,crown length ratio,and single volume of C. konishii showed dually decreasing changes with the increase of planting density with inhibitory effects. The stand volume,stem fullness,ratio of height to diameter,branch height,breast height factor and coefficient of variation of relative diameter and the number ratio of below grade II and III forest wood showed gradually increasing changes with promotion effect. There was no significant influence on plantation preservation rate,stem straightness,taperingness of planting density of C. konishii. Planting density significantly affected the comprehensive score of C. konishii,showing it is necessity of reasonable planting density. The overall growth performance of C. konishii plantation with 3 600 tree·hm^-2 planting densities was the best,which was conducive in the cultivation of large diameter timber of C. konishii with timely thinning and tending.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第1期7-11,共5页
Journal of Northeast Forestry University
基金
福建省属公益类科研院所基本科研专项(2011R1013-2)
关键词
峦大杉
造林密度
生长
形质
林分分化
优化
Cunninghamia konishii
Growth
Form quality
Stand differentiation
Optimization
