Distribution pattern and dynamics of Alnus nepalensis and Litsea glutinosa populations in Nomascus concolor habitat
旱冬瓜（Alnus nepalensis）和潺槁木姜子（Litsea glutinosa）是云南省无量山黑长臂猿（Nomascus concolor）栖息地中的两种常见乔木.利用最近邻体法和Heygi单木竞争指数模型，对两个种群的分布格局和竞争情况进行分析.结果表明，旱冬瓜在不同生长阶段均呈现随机分布，而伴生的潺槁木姜子种群则呈现随机分布聚集分布均匀分布的变化趋势.种间竞争和物种自身生物学特性对两个种群的分布格局具有显著影响.旱冬瓜种群的龄级结构为衰退型，潺槁木姜子种群则为成长型.
Alnus nepalensis and Litsea glutinosa are the two common trees in the habitats of black-crested gibbons (Nomascus concolor) in Wuliang Mountain of Yunnan Province.With the nearest neighbor method and Heygi’scompetition index model for individual tree,this paper analyzed the distribution patterns of the two populations and their competition.The results showed that A.nepalensis had a random distribution at its different growth phases,while L.glutinosa,the companion species of A.nepalensis,exhibited the trend of random distribution-clumped distribution-regular distribution.Interspecific competition and biological characters had significant effects on the distribution patterns of A.nepalensis and L.glutinosa.Regression age structure was observed in A.nepalensis population,while increasing age structure presented in L.glutinosa population.
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