Abstract:

The succession process of evergreen broadleaf forest in the subtropical zone of China commonly covers coniferous forest stage,mixed forest stage including both coniferous and broadleaf trees but taking the coniferous tree as the dominant component,mixed forest stage taking light-loving broadleaf tree as the dominant component,ever-green broadleaf forest stage taking light-loving broadleaf tree as the dominant component,climax stages divided into two stages based on the spatial pattems of dominant tree species:unperfectly developed climax stage and perfectly developed climax stage.According to view of the above,the deliberated ever-green broadleaf forest community in this study was judged to be in uperfectly developed climax stage.The extent of population extension of strongly light-loving tree species was positively correlated with the disturbance intensity.The disturbance leading the strongly light-loving tree species to be come the first dominant species of the community was called disturbance leading regressive succession.The disturbance leading the strongly light-loving tree species to be a dominant species of the community but not the first dominant species was called disturbance non leading regressive succession.The intensity of a disturbance leading regressive succession was stranger than that of a disturbance non leading regressive succession.The judgement of succession stage and the evaluation of disturbance intensity form a set of material on the judgmet and the evaluation of succession situation for a natural forest community.

Key words: Succession stage judgment, Disturbance intensity evaluation, Dominant tree species altemation Population extension and decline, Spatial pattem