黄山常绿阔叶林优势种甜槠的种群动态与点格局分析

Population Dynamics and Point Pattern Analysis of Castanopsis eyrei in Dominant of the Broad-leaved Evergreen Forest in Mount Huangshan

该研究以黄山森林植物多样性监测的3个大样地(钓桥庵、云谷寺、望瀑楼)内的优势种——甜槠(Castanopsiseyrei)种群为对象,分别从年龄结构、静态生命表、存活曲线、种群增长模型、生存分析和点格局分析等方面对甜槠种群的数量动态与空间分布格局进行了研究。结果表明:(1)研究区3个样地的甜槠均呈现种群幼苗众多,幼树储备丰富,且各样地个体数均随着龄级的增加逐渐减少,说明研究区甜槠种群均处于增长阶段,更新能力强,属于稳定型种群。(2)钓桥庵和望瀑楼样地的甜槠种群存活曲线均趋近于DeeveyⅡ型,两样地内甜槠各龄级均具有相近的死亡率,出现的3个死亡高峰分别在幼年期、近成熟前期和老龄期。(3)云谷寺样地的甜槠种群存活曲线趋近于DeeveyⅢ型,其前期死亡率较高,中期和后期死亡率比较低而且稳定。(4)黄山森林植物中甜槠种群在小尺度呈显著的聚集性,随着尺度的增加则表现为随机分布。

This article takes the dominant species Castanopsis eyrei population in three sample plots(Diaoqiaoan,Yungusi and Wangpulou)for monitoring forest plant diversity in Mount Huangshan as the research object.Using population size structure analysis,static life table,survival curve,population growth model and point pattern analysis,we studied the population size dynamics and spatial distribution pattern.Results showed that:(1)Castanopsis eyrei population in three sample plots showed a large number of seedlings,abundant saplings,and the number of individuals in each sample plot gradually decreased with the increase of age class,indicating that C.eyrei population was in the growth stage,with strong renewal ability,belonging to a stable population.(2)The survival curves in Diaoqiaoan and Wangpulou plots were similar to DeeveyⅡtype.The mortality rates at different age levels were similar in the two plots.The three death peaks were in juvenile stage,early maturity stage and old age.(3)the survival curve of Yungusi plot was DeeveyⅢtype,the mortality rate was higher at the young stage than the mature and aging stage.(4)C.eyrei population in forest plants of Mount Huangshan was contagious distribution in small scale and it turned to be uniform distribution or random distribution at large scale.