东祁连山青海云杉种群大小结构及其动态研究

采用大小级结构和聚类的方法分析东祁连山青海云杉种群结构及其增长趋势。结果表明:青海云杉种群大小级结构可划归于增长型、稳定型、成熟型和衰退型;东祁连山青海云杉林大都处于中龄林阶段,属于稳定型种群;种群大小级结构动态与青海云杉林演替序列基本上成线性关系,体现了种群自组织、自发展的趋稳性;成、过熟林种群大小级结构的非线性波动则体现了种群以自恢复、自调节使群落整体达到相对稳定状态。

Size structure and dynamic of the Picea crassifolia populations on eastern Qilian Mountains

The structure and growth trend of the Picea crassifolia populations on eastern Qilian Mountains were analyzed using the method of size structure and cluster. The results demonstrated that there were four types of size structure of the populations as the increasing type,the stationary type,the mature type and the declining type;the Picea crassifolia populations on eastern Qilian Mountains were mostly in middle-aged forest stage,belonging to a stationary type;the relationship between size structure dynamic of the populations and succession appeared to be linear,embodying the tendency toward steady state of the population by self-organization and self-development;some non-linear fluctuation of size structure occurred in the mature and over mature stages,embodying the relative steady-state by self-regulation and self-repair of the population.