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本文对Ｉ—４５杨的苗期、幼林物候及生长情况进行了观察。在长春、辉南Ｉ—４５杨能够完成正常的生育周期，顶芽形成期在８月末、９月初，较大青杨提前３～４天时间。苗期高生长集中在６～７月份，出现两个生长高峰期，日平均生长量可达４ｃｍ。幼林第４年生长开始加快，胸径最大年生长量为３．１ｃｍ，年生长主要在６月下旬至８月中旬，各旬生长量基本一致，平均为０．３ｃｍ。通过对Ｉ—４５杨生长规律的观察，可为林木速生丰产、科学管理提供依据。
In this paper, I-45 poplar seedlings, young forest phenology and growth were observed. In Changchun, Huinan I-45 Yang to complete the normal fertility cycle, the top bud formation period at the end of August, early September, larger Populus 3 to 4 days in advance. High seedling growth concentrated in June to July, there are two peak growth, the average daily growth of up to 4cm. The growth of young forest began to accelerate in the fourth year. The maximum annual increment of breast diameter was 3.1cm. The annual growth mainly lasted from the end of June to the middle of August. The growth of the young forest was consistent with the average growth of 0.3cm. By observing the growth law of I-45 Yang, it can provide the basis for quick-growing and yielding forest and scientific management.