Dynamics Death of Constructive Species in Monsoon Evergreen Broad Leaved Forest

The constructive species Cryptocarya concinna of monsoon evergreen broad leaved forest located in Dinghushan natural reserve was monitored over 20 years. A phenomenon that number of dead individuals was significantly greater than newly increased individuals was observed. In this study, based on datas C. concinna for 12 years, community were divided severe interference and light interference stages by interference degree and dynamics death of C. concinna was statistics. Used the spatial binary point pattern Lfunction to analyze associations between new and dead individuals at different interference stages. The study results showed that 482% dead individuals were small size trees with DBH less than 4cm in severe interference stage, while 805% dead individuals were big size trees with DBH more than 10cm. New individual occurred in 1992 were positively associated with dead tree number in 1999 and 2004 at some scales. However, when sampling scale was less 1m, only found a spatial positive correlation between new individual in 1999 and dead tree in 2004. Spatial correlation analysis of dead trees in previous stage and new trees indicated that trees death number occurred from 1999 to 2004 were positively correlated to dead trees number counted in 2004 at a small scale (sampling scale was less 5m). The number of tree death in 12 years was 229 times the number of new added trees. Dead trees were mainly those individuals newly increased since 1992. Severe interference accelerated succession process of community. Therefore, in the process of future monitoring, we should take strict precautions against severe interference, and insure zonal vegetation monsoon evergreen broad leaved forest normally development and succession.