园林植物醉香含笑幼苗生长节律研究

[目的]研究醉香含笑幼苗的生长节律。[方法]对醉香含笑1年生幼苗苗高和地径进行定期观察研究并应用有序聚类分析法对醉香含笑苗生长期进行定量分析。[结果]1年生醉香含笑苗木的生长可划分为以下4个生长时期：出苗期3月8日～6月6日；生长初期6月6日～8月3日；速生期8月3日～9月18日；生长后期9月18日～11月5日。醉香含笑1年生幼苗在1年生长过程中苗高呈“S”型增长趋势，地径的增长基本上呈平稳上升的趋势，苗高和地径比值在7月中旬前呈增长趋势，然后比值略有下降，之后比值快速提高，并于9月2日前后达到极值。[结论]该研究为醉香含笑的培育提供了科学依据。

Study on Growth Rhythm of Landscape Plant Michelia macclurel Seedlings

[Objective] The aim was study the growth rhythm of Michelia macclurel seedlings.[Method] The seedling height and ground diameter of 1-year M.macclurel seedlings were observed regularly and the growth period of M.macclurel seedlings were analyzed quantitatively by the method of order cluster analysis.[Result] The growth period of 1-year M.macclurel were divided into 4 stages: emergence stage was on March 8 to June 6,early growth period was on June 6 to August 3,fast growing period was on August 3 to September 18 and late growth period was on September 18 to November 5.The seedling height of 1-year M.macclurel seedlings showed S type increasing trend during 1 year growth process,ground diameter showed steady increasing trend and the ratio of seedling height to ground diameter showed increasing trend before the middle of July,then the ratio was decreased slightly and then was increased fast and it reached extremum around September 2.[Conclusion]The research provided the scientific basis for the breeding of M.macclurel.