长白山北坡岳桦种群结构及动态分析

Structure and dynamics of Betula ermanii population on the Northern slope of Changbai Mountain.

以“空间代时间”的方法 ,以种群径级结构代替年龄结构 ,采用静态生命表、生存分析和空间格局分析方法 ,探讨了长白山北坡不同海拔分布的岳桦种群的结构和动态规律。结果表明 ,在海拔 180 0、190 0和 2 0 0 0m ,随海拔升高 ,岳桦种群密度增大 ,径级分布范围减小 ,种群存活曲线由DeeveyⅡ型过渡到DeeveyⅠ型 ,种群由稳定型过渡为增长型 ,说明岳桦种群由低海拔向高海拔 ,群落处于不同的演替和发展阶段。而且随着岳桦径级的增大 ,其分布格局由集群分布过渡到随机分布。

With the method of spatial sere substituting for time sere, by trunk size structure in place of age structure, using life table, survival analysis and pattern analysis, the structure and dynamics of Betula ermanii population at different elevation on the Northern slope of Changbai Mountain were studied. Along the altitude the population density increased, distribution range of size class decreased, survival curves changed from DeeveyⅡtype to DeeveyⅠtype, and population size structure transited from stationary to growing type. It indicated that Betula ermanii population at different elevations developed at different stages. Moreover, with the tree growth, population distribution pattern varied from contagious type to random type.