杉木人工林林下更新试验研究初报

A Preliminary Report on Experiment of Chinese fir Artificial Regeneration under Canopy

为研究杉木人工林林下更新技术,选择了一片32年生杉木林设置固定观测试验地,对其采用4种不同疏伐强度(每公顷保留株数分别为75株、l50株、225株和300株)处理,随后采用1年生杉木实生苗在林冠下进行造林更新,形成复层林,同时设置对照(皆伐后造林更新形成单层林)处理。试验结果表明:老杉木每公顷保留密度为75株、l50株、225株和300株的林下杉木更新幼树的平均树高分别为对照的97.19%、94.94%、90.45%和84.83%,平均地径分别为对照的96.23%、109.12%、96.23%和80.82%。不同处理间的杉木更新幼树的地径生长有显著差异,在复层林中以杉木老树每公顷保留株数为105～135株处理的林下更新杉木生长为最好;但不同处理间的杉木更新幼树的树高生长没有显著差异。

This article studies the techniques of artificial regeneration of Chinese fir under canopy. Taking Pushang State Forest Farm of Shunchang County,Fujian Province as research object, itselects a 32--year- old Chinese fir plantation to establish the trial site, and conducts four thinning intensities （remaining tree density are 75,1 5,225 and 300 stem ~ hrn z）,followed by artificial regeneration of Chinese fir under canopy using 1--year--old seedlings to make multi--storied stands. And then it establishes the control plots（clear felling followed by artificial regeneration of Chinese fir using 1- year--old seedlings to make uniform stands）. Two years after the treatments,average tree height of the treatments with 75,150,225 and 300 stem · hm ^-2 are 97. 19%、94. 94%,90. 45% and 84.83% respectivelY,and the tree ground diameter growth of young Chinese fir among different treatments are of significant differences. In the multi--storied stand,the tree growth under the treatment with 150 stem· hm^-2 remaining tree density is the beat. But there is no significant differences in tree height of young Chinese fir among different treatments.