百山祖北坡常绿阔叶林多脉青冈种群结构和分布格局

本研究应用理论分布模型和5个聚集强度指标，研究百山祖北坡中山常绿阔叶林多脉青冈种群分布格局。结果表明：多脉青冈种群结构呈基部和中部宽、顶部窄的形状，龄级完整，属于稳定型，但存在波动性；从整个种群和不同发育阶段来看，多脉青冈的分布格局主要呈聚集分布，且随年龄增长，聚集度逐渐降低，呈现扩散趋势，到大树期为随机分布。种群自身生物学特性、种群生境以及环境资源等综合因素影响多脉青冈的年龄结构和分布格局。

Structure and Distribution Pattern of Cyclobalanopsis multinervis Population in an Evergreen Broad-leaved Forest in Baishanzu

In the study, we applied the theoretical spatial distribution model and 5 aggregation intensity indices to assess the spatial distribution pattern of Cyclobalanopsis multinervis in an evergreen broad-leaved forest in the Baishanzu National Nature Reserve. The results show that the shape of size structure of the C. multinervis population is pyramid with wide base and narrow top, which indicates the population is stable in this forest. The species bearing whole range of size classes shows regeneration fluctuation. Distribution patterns of the whole population and different growth stages of the species are clumped in general. The extent of aggregation reduces along with size class of trees, suggesting a loosing tendency to large trees for random distribution. The synthesized effect of species’ biological characteristics, habitat and environmental resources occupied, influences the population structure and distribution pattern of C. multinervis.