Abstract:

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.

Key words: Forest community, Origin of community, Daqinggou