习水自然保护区桫椤种群结构与分布格局研究  

Structure and Distribution Pattern of Alsophila spinulosa Populations in Danxia Landform in Xishui Nature Reserve

作　　者：徐德静[1] 郭能彬 王鹏鹏[1] 何跃军[1] 穆军 

机构地区：[1]贵州大学林学院,贵阳550025 [2]贵州赤水桫椤国家级自然保护区管理局,贵州赤水5647003 [3]贵州习水自然保护区管理局,贵州习水564600

出　　处：《西南大学学报（自然科学版）》2014年第11期93-98,共6页Journal of Southwest University(Natural Science Edition)

基　　金：贵州省科技厅社会发展攻关资助项目(黔科合SY[2010]3040号)

摘　　要：为了更好地了解丹霞地貌桫椤种群动态与分布格局,根据对桫椤种群的样地调查和数据统计,将桫椤个体依茎干高度分级,编制其静态生命表,绘制存活曲线、危险率函数和死亡密度函数曲线等;运用v/m,k,CA,m*/m和C共5种聚集度指标测定其种群的空间分布格局及其动态.结果表明:现阶段桫椤种群结构为衰退型,桫椤种群以中龄林为主,幼株个体数量严重缺失,种群死亡趋势是生长后期高于生长前期,在Ⅵ,Ⅶ龄级阶段出现死亡高峰;种群分布格局近似于随机分布.In order to understand the population structure and distribution pattern of A lsophila spinulosa in Danxia landform ,a sample plot investigation was conducted in Xishui ,Guizhou ,in which the A. spinulosa trees were graded according to their height .Based on the statistical data ,a static life table of this plant species was worked out and their survivorship curve ,hazard rate function curve and mortality rate function curve were plotted .Then five aggregation indices （v/m ,K ,CA ,m＊/m and C） .were used to determine the spatial distribution pattern and dynamics of the population .The results showed that at the present time the structure of the local A. spinulosa population was of the diminishing type ,middle age of stand was predominant ,and the number of young individuals was very small .The death rate of the popula‐tion was higher in the later stage than in the earlier stage ,and the peak of mortality occurred in height classes Ⅵ and Ⅶ .The population exhibited a distribution pattern similar to random distribution .

关 键 词：桫椤 种群结构 分布格局 丹霞地貌 

分 类 号：Q948.157[生物学—植物学]