Population structure of Betula dahurica families in Xiaolongmen forest farm was assayed.The specific life table was drawn.According to the table,the survivorship curve and death curve were analyzed.

• 调查小龙门林场棘皮桦林的种群结构,编制棘皮桦的生命表,绘制种群的存活及死亡曲线进行生存分析。