The intraspecific competition was stronger than interspecific competition for 5-10 cm, 15-20 cm, 20-25 cm and 35-40 cm diameter scales in plot 3, whereas it was contrary for other diameter scales. 5.

• 样地3内 5-10cm、15-20cm、20-25cm和35-40cm径级种内竞争大于种间竞争，10-15cm、25-30cm及30-35cm各径级种间竞争大于种内竞争。