关键词: 白桦种群, 稳定性, 火干扰

Abstract: This paper, which is from the view of Disturbance and Population Ecology and based on the reconstructing fire disturbance history from live and dead materials, studies the relation between the stability of Betula platyphylla population and the fire disturbance in the northern Daxinganling Mountains with the method of division of population cohort.The result reveals that:Betula platyphylla population is stable depending on its strong post-fire resilence, but the fire resistance and self-resilience are weak.The fire resistance of population is related to the fire disturbance regime, the ranks of different fire regime type are listed follows:low frequencymiddle < middle frequencyhigh < high frequency, high severitymiddle < middle severity < low severity.The post-fire resilience and self-resilience are related to the last fire regime, and the post-fire resilience shows follow sequences:short periodlong < long period < middle period.The self-resilience is that:short periodmiddle < middle period < long period.Both the sequences of the two resilences are that:low severityhigh > high severity > middle severity.This research concludes that:Betula platyphylla population is adapted to the fire disturbance regime of low severity and high frequency in the northern Daxinganling Mountains.The post-fire regeneration is the major manner for Betula platyphylla population keeps stable and the regeneration under the canopy is an assistant one.

Key words: Betula platyphylla, Stability, Fire disturbance regime