By investigating gap generation of virgin fir forest on Mount Sejila, the size and the generation of gaps, relationship between the age and the regeneration of gaps were studied and the qualitative characteristics and the growth up of seedling, young tree and small tree between gaps and non gaps were compared.

Based on the data collected from a standard permanent plot of a primeval Abies georgei var.

We have done systematical research on the trends change law and distribution proportion in different stage of through precipitation, trunk runoff and crown interception with observed data from 1999 to 2001 years of precipitation of the Abies georgei var.

The T-square study on the spatial pattern of Spruce-fir forest in Jingouling Forest Farm shows that two spruce-fir forests are separately in aggregate distribution and random distribution.

Root biomass of broad-leaved Korean pine forest(BLKPF), spruce-fir forest(SF) and subalpine berch forest(SBF) in Changbai Mountain was studied in this paper.

This paper took spruce-fir forests in over-logged forest region of Changbai Mountain as research object, adopted qualitative and quantitative research approaches, and then analysed environmental impact on regeneration, remained trees, soil, vegetation and so on caused b.