连续3a对小兴安岭地区低质林验样地内苗木的成活率、保存率和生长率进行实地调查,运用统计分析的方法进行分析,结果表明:改造3a后,3种苗木的保存率无明显差异.3a内3种苗木的生长率大小次序为:落叶松大于红松大于云杉.在带状皆伐改造模式中,红松在8m和10 m带宽的水平皆伐带内的生长效果较好；云杉在6m和8m带宽的垂直皆伐带内的生长效果较好；落叶松在10m和15m带宽的水平皆伐带内的生长效果较好.在林窗改造方式下,红松在面积为150到300 m2的林窗内生长效果较好；云杉在面积为25到100 m2的林窗内生长效果较好；落叶松在林窗内的生长状况指标均很高,生长效果都较好,无明显差异.根据苗木的生长效果为低质林改造选择合理的改造模式提供理论依据.%Survival rate, preservation rate, and growth rate of seedlings were surveyed in low-quality stands in Lesser Xing' an Mountains in three consecutive years. A statistical analysis of data was made. Results showed that, three years after transformation, the preservation rates of three species of seedlings ( Dahurian larch, Korean pine, and dragon spruce) had no obvious difference. The growth rate of Dahurian larch seedlings was the highest, followed by Korean pine and dragon spruce. For the transformation mode of clear-cutting by strips, the better growth effect was observed in bandwidth of 8 m and 10 m for Korean pine seedlings, bandwidth of 6 m and 8 m for dragon spruce, and bandwidth of 10 m and 15 m for Dahurian larch. For the transformation mode of forest gap, the better growth effect was observed in 150-300 m2 forest gaps for Korean pine, and 25-100 m2 forest gaps for dragon spruce. However, no significant difference in growth effect of Dahurian larch seedlings was found between all the forest gaps.
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