樟树无性系组培苗丘陵山地造林早期生长分析

Analyses on Growth of 5-year-old Plantation of Cinnamomum camphora Clone on Hills

以樟树（Cinnamomum camphora）无性系组培苗营建试验林，对林木1-5a生生长情况进行调查分析。结果表明：1a生幼林的平均树高和平均冠幅分别为1．12m和1．1m；3a生平均树高、平均冠幅和平均胸径分别为3．34m、1．4m和2．94cm；5a生平均树高、平均冠幅和平均胸径依次为5．35m、1．68m和4．8cm，分别比3a生增加60．01％、20．1％和63．26％。不同林龄的树高有极显著差异（P〈0．01）；5a生和3a生的胸径有显著差异（P〈0．05），但冠幅差异不显著。树高、冠幅和胸径在区组间差异均不显著，表明群体的生长表现较一致。

The experimental stand was established using tissue culture seedlings of Cinnamomum camphora clone, and its growth was studied. The results showed that the average tree height and canopy width of the 1-year-old seedlings were 1.12 m and 1.1 m respectively; the average tree height, canopy width and DBH of 3-year old trees were 3.34 m, 1.4 m and 2.94 cm respectively, while those of the 5-year-old trees were 5.35 m, 1.68 m and 4.8 cm respectively, which were an increase of 60.01% , 20.1% and 63.26% respectively compared with the 3-year-old trees. The tree height showed very significant differences in different years （ P 〈 0.01 ） . There were significant difference in DBH between the 5-year-old trees and 3-year-old trees （ P 〈 0.05 ） , but there was no significant difference in the growth of canopy width. There were no notable differences in growth among blocks, which showed that the growth of plantation was consistent.