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. InApril 2019, seedlings were transplanted in containers。Determinations were carried out from May 6th to December 25th on height and ground diametergrowth. The result showed that height and ground diameter growth had the same slow-fast-slow rhythm. Height and ground diameter growth wasfitted 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 growthperiod and for 63.77% of the total increment height increment. Rapid growth stage of ground diameter was 125 days, accounting for 45.42% of thewhole growth period, and for 66.15% of the total ground diameter increment.