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作 者 ：丁贵杰 周政贤 严仁发 潘盛荣 杨胜洲

期 刊 ：林业科学 1997年 33卷 zk1期 页码：67-75

关键词：杉木；造林密度；生长进程；经济分析；

Keywords:Chinese fir, Planting density, Growth process, Economic analysis,

摘 要 ：用15年生造林密度试验林的逐年测定资料，分析了造林密度对生长和经济效益的影响，结果表明：造林密度对树高有一定影响，但差异不显著；胸径、单株材积、冠幅随密度增大而减小，4年后处理间差异一直显著；蓄积量、高径比随密度增加而增加，前者在7-12年差异显著，后者不显著。随密度增加，小径阶株数百分比明显增大，大径阶数株数及出材量急剧减小(最高相差4倍以上)，株数分布曲线峰值偏左，每增加一个密度级，峰值向左移动一个径阶。经生长量、出材量、经济评价结果的综合分析，认为在18-20指数级上培育大、中径材，以初植密度1667株/hm²最优，其次是2500株/hm²。

Abstract:The effects of planing density on the growth and economic benefit of Chinese fir were analysed by data of 15-year-old planting density trial stand，the results showed that planting density had the effect on the mean height of trees，but the difference was not significant．Diameter at breast height，single-tree volume，crown diameter alI decreased with the increase of density，the differ-ence among treatments was significance after 4 years．Both growing stock and height/diameter ratio increased with the increase of density，the difference in growing stock was significant from 7 to 12 years-old，but height/diameter ratio was not significant．Trees percentage of small logs increased with the increase of density，but trees and merchantable volume of large timber rapidly decreased．The peak of curve of trees distribution skewed to left．the peak move a diameter groups to left with　increasing a density class．By a synthetic analysis of growth increment，merchantable volume and e-conomic evaluation，the initial planting density was 1667 tree/hm²，which was considered as opti-mum．for cultivating large or middle diameter timber on a 18—20 site index．the density of 2500 tree/hm2 is also beneficial next to former one．

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