摘要
利用16-21年生马尾松近熟林间伐密度试验林的观测资料,探讨了不同间伐强度对林分生长与效益的影响。结果表明,不同间伐保存密度(450、600、750、900、1 036株/hm2)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、冠幅随密度增大而减小,密度对树高生长无显著影响;不同间伐密度的林分蓄积量与出材量随着时间推移差异变小;间伐有利于提高大径级林木株数比率从而提高材种规格与效益。根据21年生马尾松人工林生长规律与效益评价,16-21年生近熟林间伐密度保存在600-900株/hm2效益较好。
The effects of thinning density on growth and economic benefit of near-mature plantation of Pinus massoniana were analyzed with the data of 16-20 year-old thinning density experiment stand（including density remained 450,600,750,900,1 036 trees per hm2）.The results showed that it had significant effects on stand growth,stand structure,log type.With the increase of stand density,diameter at breast height（DBH）,single tree volume and crown diameter decreased.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.Large logs rate and mill run of large timber increased by thinning,so the wood quality and economic benefits improved.By a synthetic analysis of growth law of 21-year-old Pinus massoniana plantation and economic evaluation,stand density of 16-21 year-old near-mature plantation could be determined as 600-900 trees per hm2.
出处
《林业科技开发》
北大核心
2012年第6期39-44,共6页
China Forestry Science and Technology
基金
国家"十一五"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(编号:2006BAD24B0301-3)
关键词
马尾松
近熟林
间伐密度
密度效应
经济评价
Pinus massoniana
near-mature plantation
thinning density
density effects
economic analysis
