灵空山辽东栎种群年龄结构与动态

Age structure and dynamics of Quercus wutaishanica population in Lingkong Mountain of Shanxi Province,China

利用生存分析理论,分析了山西灵空山自然保护区辽东栎种群的年龄结构,以及树高与胸径的关系,绘制了静态生命表和存活曲线.结果表明:辽东栎种群年龄结构金字塔呈两头小中间大的纺锤型,处于稳定状态.辽东栎种群的树高和胸径的相关关系可用一元线性方程拟合.辽东栎种群的最高生命期望值出现在死亡率最高的龄级之后,且极大值与死亡密度最小值相对应,说明在经过自然筛选和种内竞争后,存活下来的幼苗幼树具有较强的生命期望寿命.辽东栎种群的存活曲线呈Deevey-Ⅱ型,为稳定种群.辽东栎种群动态表现为前期衰退、中期增长、后期稳定.

Using the plant survivorship theory, the age structure, and the relationship between tree height and diameter （DBH） of Quercus wutaishanica population in Lingkong Mountain were analyzed, and the static life table was compiled and the survival curve plotted. The shuttle shape in age structure of Q. wutaishanica population suggested its temporal stability. The linear regression significantly fitted the positive correlation between tree height and DBH. The maximal life expectancy was observed among the trees beyond the age of the highest mortality and coincided with the lowest point of mortality density, suggesting the strong vitality of the seedlings and young trees that survived in the natural selection and intraspecific competition. The population stability of the Q. wutaishanica population was characterized by the Deevey-Ⅱ of the survival curve. The dynamic pattern was characterized by the recession in the early phase, growth in the intermediate phase, and stability in the latter phase.