Analysis of the Freezing Damage to Biennial Eucalyptus dunnii and Eucalyptus smithii in Haikou Forest Farm

• 作者: Yan Yi Wang Youbing He Yinzhong Zhou Qinghong Wang Yating
• 来源期刊: 气象与环境研究：英文版
• 学科: 农学
• 关键词: 冻害分析 史密斯桉 邓恩桉 林场 海口 大肠杆菌 相关系数 家庭
• 年，卷（期）: 2014,（8）
• 页码范围: 31-33
• 页数: 3页
• 分类号: S792.39

摘要

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.