凤阳山常绿阔叶林优势种木荷的种群结构与动态

Structure and Dynamic Characteristics of Schima superba Populations in Evergreen Broad-leaved Forest in Fengyangshan Mountain

[目的]对木荷(Schima superba)天然种群的种群结构和动态进行了分析预测,旨在阐明木荷种群结构与动态的变化规律。[方法]根据种群静态生命表、存活曲线、时间序列分析等方法,分析凤阳山保护区木荷种群的数量动态变化。[结果]木荷种群的年龄结构近似于倒“J”形,龄级Ⅰ和龄级Ⅱ个体占种群数量的比例较大。木荷种群趋于Deevey-Ⅱ型,其死亡率和消失率具有相同的变化趋势。在经历2、4、6、8个龄级后,种群个体数量均呈上升趋势。[结论]木荷种群为增长型种群。种群动态指数和受外界干扰时的动态指数均为正值,但对外界干扰敏感指数较高,暗示种群仍面临较大的外界干扰。

[Objective]To evaluate the population dynamics of Schima superba in Fengyangshan Mountain.[Method]This study established a static life table,depicted survival curves and made predictions with a time-sequence model,based on a field investigation in a 0.8ha evergreen broad-leaved forest plot.[Result]The age structure was in an inverse-J shape,and mainly aggregated on size class I and size class II.The population approximately tended to the Deevey-II type,which grew stably at present stage.Both the mortality and disappearance rate curves exhibited the same trend.Time sequence predictive analysis showed that the number of Schima superba individuals increased after the 2,4,6,8 size classes,the population showed an increasing trend.[Conclusion]The population dynamic index V_(pi)>0 and V_(pi)^(′)>0 indicated that the Schima superba population belonged to the growth type.However,the population is relative sensitive to disturbance,indicate the population affected mainly by environmental factors.