珍稀濒危植物--崖柏种群结构与动态初步研究

基于对崖柏产地7个典型群落的实地调查,运用“空间序列代替时间序列”的方法,对崖柏种群年龄结构与动态进行研究。结果表明：崖柏种群各龄级间出现严重的不连续现象;根据年龄结构图和存活曲线,崖柏种群年龄结构可划分为4个类型：增长型,始衰型,中衰型和老衰型;同时所有群落的调查表明,崖柏幼苗幼树数量稀少且个体死亡率高,故认为种群增长接近于衰退状态。

A Preliminary Study on Population Structure and Dynamics of A Rare and Endangered Plant,Thuja sutchuenensis(Cupressaceae)

Thuja sutchuenensis is a rare and endangered species in China which was rediscoveried recently. Investigation was carried out in, Kaixian County and Chengkou County, where the species is distributed.With the method of spatial sere substituting for time sere, the age-structure and dynamics of T.sutchuenensis populations in seven typical communities were discussed.Then according to the size-structure and size-survivorship curve of these populations,the types of age-structure,which was of serious incompletion,were classified into the growing type, the initial declining type, the mid-declining type and the declining type. Seen from its high death rate and sparsity of seedlings and saplings, shown in the field surveying, T.sutchuenensis population is thought to be a senescent one.