摘要
利用20年生马尾松间伐密度试验林的10年观测资料,分析不同间伐保存密度对林分生长和经济效益的影响。结果表明:不同间伐保存密度(1200,2000,2800和3400株·hm-2)对林分生长、林分结构及材种规格均有显著影响,其中林分胸径、单株材积、冠幅、冠高比随密度增大而减小,高径比、自然稀疏强度随密度增大而增大,密度对树高生长无显著影响;不同密度的林分蓄积量与出材量随林龄增长而差异变小;随着密度增大,小径阶株数率及小径材出材量所占的比例增大,而大径阶株数率与大径材出材量减少。综合效益核算、材种出材量及马尾松人工林生长规律,马尾松人工林进入中龄林期后培育纤维材与中小径材保存密度控制在B～D(约2000～3400株·hm-2)并在15～17年生时采伐效益较好,培育大、中径材林分保存在A～B(约1200～2000株·hm-2)间的密度效益较好。
The effects of thinning density on growth and economic benefit of masson pine plantation were analyzed by 10 years data of 20-year-old thinning density experiment stand（including treatments of A,B,C,D,their density remained is 1 200,2 000,2 800,3 400 trees·hm^-2 respectively）,the results showed that it had significant effects on stand growth, stand structure ,log type and mill run. With the increase of stand density,diameter at breast height（ DBH）,single tree volume,crown diameter,ratio of crown length to tree height decreased,but tree height /DBH,self-thinning intensity increased. The thinning density had no significant effect on tree height. With stand age increasing,the difference of stand volume and total mill run of different density stand decreased. Trees percentage of small logs and mill run of small timber increased with the increase of stand density,but which of large timber decreased. So it is difficult to raise stand final productivity by thinning,but it can improve the wood quality. By a synthetic analysis of mill run,economic evaluation and growth law of masson pine plantation,stand density of cultivating short rotation industry timber could be determined as 2 000 ～ 3 400 trees·hm^-2 when the stand age entered the middle-aged stage ,to cultivate large or middle diameter timber, which could be determined as 1 200 ～ 2 000 trees·hm^-2 .
出处
《林业科学》
EI
CAS
CSCD
北大核心
2010年第5期84-91,共8页
Scientia Silvae Sinicae
基金
国家"十一五"林业科技支撑计划"马尾松大径材与高产脂林培育关键技术研究与示范"专题广西子专题(2006BAD24B0301-3)
贵州优秀人才基金课题"马尾松优质工业用材林持续稳定发展的机制及技术研究"(TZDF-2007.20)的部分内容
关键词
马尾松
间伐
密度效应
经济分析
出材量
massom pine
thinning density
density effects
economic analysis
mill run
