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通过对华北落叶松二年生苗地上部分生长规律的研究，结果表明，在实验地条件下，华北落叶松3月下旬芽萌动，4月初展叶，6月初叶已完全展开，6月底叶数增长最快。平均苗高与平均地径生长量最大峰值分别出现在6月20日和6月30日。整个生长期分两阶段，第1阶段生长量随旬平均温度和旬积温值升高而增加，第2阶段随旬积温值的升高而减少，体现了华北落叶松特有的生长规律
The results showed that Larix principis-rupprechtii buds germinated in late March and started to bloom in early April and early June respectively. The number of leaves increased at the end of June fast. The average peak height of average seedling height and mean diameter growth appeared on June 20 and June 30, respectively. The whole growth period is divided into two stages. The growth of the first stage increased with the increase of the ten-day average temperature and the ten-day temperature. The second stage decreased with the increase of the ten-fold accumulated temperature, which reflected the unique growth pattern of Larix principis-rupprechtii