Dynamics of Betula ermanni population in subalpine vegetation in Changbai Mountain, Northeast China

摘要

Betula ermanni population was divided into three groups: the upper population (2 000～2 200 m), the middle population (1 700～2000 m), and the down population (1 400～1 700 m) in Changbai Mountain. The dynamics of Betula ermanni populations in subalpine vegetation are studied and the population life table,fecundity schedule, survival curves, age structure, and fecundity curves were established. The results showed that the middle population is obviously the transition from the upper population to the down population.