Study on Intraspecific and Interspecific Competition in Abies fargesii on Taibai Mountain

The improved competition index and method of qualify the competition zone reflecting objectively the competition and growth pattern of Abies fargesii were selected.The results showed that:with the increase of the size and the distance,the intraspecific competition intensity decreased,because of the population density regulation during self-thinning.In the community,the competition intensity of interspecific was more excessive than that of intraspecific.The order of competition intensity was Larix chinensis-A.fargesii>A.fargesii-A.fargesii>Betula utilis-A.fargesii>other species-A.fargesii.The relationship between competition intensity and individual growth of objective tree followed closely the following equation CI=AD^-B,and the changing of competition intensity was very small when the diameter of the objective tree growed to 25 cm.The improved method could simulate and predict the intraspecific and interspecific competition of A.fargesii efficiently.