不同造林密度对火力楠早期生长的影响

Effects of Different planting Densities on the Growth of Michelia macclurei

摘要:

为 了解有利于火力楠早期生长的合理种植密度,以达到较佳的人工林生长效益,本文选用 6个造林密度对火力 楠进行密度试验 。根据 3. 5 a 的观测数据进行分析结果表明:火力楠造林早期 1. 5~2. 5 a 时,不同造林密度对火力楠树木 的生长影响不大,但到第 3. 5年起,不同密度间树高生长呈显著差异,但胸径大小尚未见有显著差异 。所以火力楠早期生 长宜采用较密的种植方式(株行距 2 m × 2 m、3 m × 2 m和 3 m × 3 m),以便林木在树高和胸径生长快速,以及形成较好树 木干形,不宜采用株行距 4 m × 4 m和 5 m × 4 m 的造林密度。

Abstract:

In order to find a suitable planting density of M. macclurei plantation for obtaining good achievements , we chose six afforestation densities to test the density effect of M. macclurei. The analysis results of the 3. 5—year — old ob- servation data showed that : there were no significant differences in the growth of M. macclurei at the early stage of 1. 5 to 2. 5 years; However, there was a significant difference in tree height growth among different densities in the 3. 5year, but there was no significant difference in DBH. Therefore, the early growth of M. macclurei should adopt a more dense planting method (spacing 2m × 2m, 3m × 2m and 3m × 3m) in order to archive good tree growth in the tree height and at the DBH and the formation of better tree stem form. It is not advisable to use planting spacing 4m × 4m and 5m × 4m.