不同杨树无性系生长节律比较研究

Studies on Growth Rhythm of Different Populus L.Clones

以25个杨树无性系为研究对象,从3月底开始在在南京林业大学实习林场—下蜀林场内,对杨树无性系苗木树高和地径生长情况进行了为期一年的定期观测研究。结果表明:大部分杨树无性系树高和地径的生长速生期均处于6~8月份;大部分杨树无性系的地径生长高峰期比其树高生长高峰期稍晚或基本同步;杨树树高生长对水、热的需求要比地径生长更为敏感;同时得出杨树苗高和地径速生期天数的多少、与速生点的早晚和无性系本身生物量的关系十分复杂。

In this experiment,25 Populus L.clones were taken for the study.Since the end of March,a one-year regular observation study on the growth of Populus L.clone seedlings in the internship forest farm of Nanjing Forestry University-Xiashu Forest Farm has been conducted.The result showed that peak period of tree height and diameter at butt end growth were same with precipitation and caloric in our region in June,July and August.The peak of ground diameter growth of most Populus L.clones was slightly later than that of height growth or basically synchronized.The height growth of Populus L.is more sensitive to the water and heat demand than the diameter growth.At the same time,the relationship among the fast-growing point,fast-growing period,biomass of trees,height and diameter is very complex.