Abstract: We selected 1-to-5-year old short-rotation Eucalyptus forests consisting of even-aged stand as sampling plots with adjacent space and similar natural conditions in Danzhou Forest Farm,which lies in west Hainan Island.Through continuous monitoring in the fixed sites,we analyzed the growth characteristics of different aged Eucalyptus plantations and their responses to climate environment.The results show that:1)The diameter at breast height of Eucalyptus plantation grew rapidly from mid April to mid July,fastest from mid July to mid October,and slowed down significantly in other months.2)Average volume increments of a single Eucalyptus tree and per hectare of Eucalyptus plantation increased from 1-to-3-year old.After the age of 3,the volume increments of 4 and 5 year old Eucalyptus forest slowed down,particularly the 5 year old Eucalyptus tree.3)The age of Eucalyptus affected its growth significantly,and there was the biggest influence in the third year.Both the precipitation and the soil water had significant correlations with individual Eucalyptus growth;however,the correlation between the temperature and the growth of individual Eucalyptus was not significant.4)Lower soil water was one of major abiotic stresses that caused the decrease of average individual volume increment of Eucalyptus forest,and the decrease was especially obvious of 5 year old Eucalyptus tree.

Key words: Eucalyptus plantation, diameter breast height, wood volume, environmental factor, west of Hainan