大青沟植物群落起源探讨

从古地质、古地理、古地貌、古土壤、古气候、古植被及现存植被与相关植物区系的关系等方面阐述了大青沟森林植物群落的起源演化过程。采用相关系数方法、模糊聚类方法探讨了大青沟植物群落与相关植物区系间的关系，结果表明：第四纪特别是全新世以来气候的大幅度波动，使大青沟地区的暖温带落叶阔叶林逐渐退缩，仅残留于特殊的避难所；大青沟森林植物群落与长白植物区系、内蒙古植物区系、华北植物区系存在密切的关系；表明大青沟森林植物群落是在长期气候条件影响下，３个植物区系交互作用产生的残遗森林群落类型。

THE ORIGIN OF PLANT COMMUNITY IN DAQINGGOU

The origin and evolution of forest plant community in Daqinggou are explained based on the geology, geography, geomophology, soil, climate, vegetation material at ancient time and the relationship between present vegetation and related plant flora et al. The correlation coeffcient method and Fuzzy Clusteringis method were adopted to study the relationship between the plant community in Daqinggou and related plant flora. The results show that the climate conditions in large extent fluctuated from the Quaternary Period especially from Holocene leading to deterioration of deciduous broad leave forest in Daqinggou, which survived only in special refuge area; The plant community in Daqinggou is significantly related with Changbai,Inner mongolia and Huabei plant flora. It shows that forest plant community in Daqinggou is a survived forest community type which was influenced by the long time climatic changes and the interaction of three plant floras.