引种元宝枫抽梢年生长规律研究

对云南引种的元宝枫生长情况在定点观测的基础上进行数据分析,结果表明:元宝枫大树和留床苗3～4 月份是高生长的主要时段。1 a中,高增长量呈单峰曲线,粗增长量呈双峰曲线;当年播种苗和移栽苗在3～5月份生长缓慢,6～7月份生长迅速;有长枝和短枝的分化,短枝在5月底停止高生长,高度不超过30 cm,长、短枝粗增长保持同步,呈双峰曲线。

The Shoot Annual Growth Pattern of Acer truncatum in Yunnan Province

The shoot annual growth pattern of Acer truncatum in Yunnan Province was reported in this paper based on the investigation of shoots growth of seedlings. In general, Acer truncatum grew fast in March and April, and retarded growth after that season. For diameter growth of Acer truncatum, there were two growth peaks appeared in March and June, while for height growth, only one growth peak was examined. Both transplanted plants and one-year-old seedlings grew slowly before May, and reached the growth peaks (including height growth and diameter growth) in June and July. Branch differentiation was obvious in Acer truncatum , and two types of branches were distinguished between long-branch and short-branch. Short-branch ceases height growth in May, however, its diameter grew synchronously with that of long-branch.