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

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。

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 observation 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 3.5 year,but there was no significant difference in DBH.Therefore,the early growth of M.macclurei should adopt a more dense planting method(spacing 2 m×2 m,3 m×2 m and 3 m×3 m)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 4 m×4 m and 5 m×4 m.