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In winter of 2013,cold weather occurred in Kunming,and biennial E. dunnii and E. smithii in Haikou Forest Farm suffered different degrees of freezing damage. The freezing damage to them was analyzed here. The results showed that in the families of E. dunnii,families suffering severe and especially severe freezing damage accounted for 7. 7%,while 92. 3% of families suffered moderate and below freezing damage; in the families of E. smithii,56. 7% of families suffered severe and especially severe freezing damage,while families suffering moderate and below freezing damage accounted for 43. 3%. There was significant difference between two species of eucalyptuses in tree height( P <0. 05),while there was extremely significant difference in freezing damage grade and index( P <0. 01). There was significantly negative correlation between the tree height and freezing damage grade of E. dunnii and E. smithii,with the correlation coefficients of- 0. 374 and- 0. 234. That is,the freezing damage grade would decrease with the increase of tree height.
In winter of 2013, a cold weather occurred in Kunming, and biennial E. dunnii and E. smithii in Haikou Forest Farm indicates different degrees of freezing damage. The freezing curve to them was analyzed here. The results showed that in the families of E. dunnii, families have severe severe and especially severe freezing damage accounted for 7. 7%, while 92. 3% of injury shares and below freezing damage; in the families of E. smithii, 56. 7% of families subjected severe severe and especially severe freezing damage, while there was significant difference between freezing damage accounted for 43. 3%. There was significant difference between two species of eucalyptuses in tree height (P <0. 05), while there was extremely significant difference in freezing damage grade and index (P <0.01). There was a significant correlation between the tree height and freezing damage grade of E. dunnii and E. smithii, with the correlation coefficients of- 0.374 and- 0. 234. That is, the freezing damage gra de would decrease with the increase of tree height.