Abstract: The intraspecific and interspecific competition intensity in Castanopsis eyrei in Tiantai Mountain of Zhejiang Province were quantitatively analyzed using Hegyi single tree competition index model. The results showed that the intraspecific competition intensity in C. eyrei decreased gradually with the increase of forest tree diameter class and the interspecific competition in C. eyrei were more intensive than those in associated tree species. The order of the intraspecific and interspecific competition intensity in C. eyrei was descending: C. eyrei, Schima superba, Pinus massoniana, Ilex wilsonii, Daphniphyllum oldhamii, Quercus glandulifera var. brevipetiolata and Castanopsis eyrei. The relationship of the competition intensity between the competitive tree and the objective tree and the individual size of objective tree obeyed power function rule and there was significanty negative correlation between the competition intensity and the individual size of objective tree. When the diameter at breast height of C. eyrei reached 30 cm, the competition intensity inconspicuously changed and suggested that this ecological system had been primarily in stable situation.

Key words: Rice germplasm, Relay seeding technique, Allelopathy, Field evaluation, Agronomic characteristics