Abstract: Eucalyptus is the dominant species in term of plantation area in south China. The study on the characters of diameter distribution for eucalyptus plantations contributes to realizing its sustainable management. The diameter distribution of eucalyptus plantations in Wenchang,Qiongzhong,Changjiang and Ledong,Hainan province was simulated by Normal distribution function,Logistic distribution function,Weibull distribution function,and Gamma distribution function models. All fitting results were tested through the chi-square test. The results show that Normal distribution function and Weibull distribution function models are more suitable for the diameter distribution of Wenchang eucalyptus plantation,and Weibull is the best simulation for Qiongzhong,Changjiang and Ledong.

Key words: Eucalyptus plantation, diameter distribution models, Weibull distribution function