Competition Relationship among Dominant Species in Pangquangou Nature Reserve and Dynamic Forecasting

Using Hegyi individual tree competition index model,the relation of intraspecific and interspecific competition of dominant species in Pangquangou Nature Reserve was quantitatively analyzed.The results showed that the intraspecific and interspecific competition intensity decreased gradually with the increasing of forest tree diameter class and the interspecific competition was stronger than those in associated tree species.The degressive order of the intraspecific and interspecific competition intensity in Larix principisrupprechtii was,for interspecific competition,Spruce,Betula albosinensis,Betula platyphylla,Salicaceae sinica,Sorbus pohuashanensis,Populus davidiana.A remarkable power model of the relationship between the competition intensity and the diameter class of objective tree is established.The competition model was established with good regression result.The study provides the scientific basis for the theory research and reasonable management of mixed stand in Pangquangou Nature Reserve.