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3年的生长量测定及多年的物候观测发现,延安的河北杨顶芽、腋芽4月初开交萌动,4月中旬开始生长,9月底生长停止。最大年生长量树高为1.43m,胸径达1.77cm。其生长量与土壤含水量、温度关系密切。
The growth of three years and phenological observations for many years found that Yan’an buds and axillary buds of Hebei Province started to bloom in early April and began to grow in mid April and stopped growing at the end of September. The maximum annual growth of 1.43m tree height, diameter of 1.77cm. Its growth and soil moisture, temperature is closely related.