琼岛杨一年生播种苗生长节律研究

于2019年5月6日到12月25日对海南省琼岛杨Populus qiongdaoensis一年生播种苗的苗高、地径生长量进行定期观测,采用Logistic方程进行生长进程拟合,研究琼岛杨的苗期生长节律。结果表明,琼岛杨苗高和地径生长都呈现"慢—快—慢"的"S"形生长规律,且苗高、地径生长量与Logistic方程的回归相关性达到极显著水平,其相关系数分别达0.994和0.996。苗高生长速生期约119 d,占生长期的39.67%,占苗高年总生长量的63.77%;地径生长速生期约125 d,占生长期的45.42%,占地径年总生长量的66.15%。

Experiment on Growth of 1-year Populus qiongdaoensis Seedlings

In February 2019,seeds of Populus qiongdaoensis were collected and from Hongshui Forest Farm of Hainan province and were sowed.In April 2019,seedlings were transplanted in containers。Determinations were carried out from May 6th to December 25th on height and ground diameter growth.The result showed that height and ground diameter growth had the same slow-fast-slow rhythm.Height and ground diameter growth was fitted by Logistic curve equation,with correlation coefficient of 0.994 and 0.996.Height growth of seedling could be divided into emergence stage,early growth stage,rapid growing stage and later stage.The rapid growth stage was about 119 days,accounting for 39.67%of the whole growth period and for 63.77%of the total increment height increment.Rapid growth stage of ground diameter was 125 days,accounting for 45.42%of the whole growth period,and for 66.15%of the total ground diameter increment.