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本文通过对4年生Ⅰ－69杨萌芽林和植苗林的调查研究表明：用采伐Ⅰ－69杨树林留下的伐桩萌芽更新效果明显，萌芽林与植苗林各项指标均有极显著差异，4年生萌芽林胸径、树高、蓄积量分别比植苗林增大18．2％、11．4％、35．7％。
In this paper, I-69 poplar sprouts and planting seedlings of 4-year-old Poplar were studied. The results showed that the sprouting of I-69 poplar trees with logging replanting improved obviously. The indexes of sprouting and planting were all significantly different.4 The annual DBH, tree height and stock volume increased by 18.2%, 11.4% and 35.7% respectively than that of the seedlings.