【摘要】 对郑州市5种桉树幼苗生长指标、光合指标及越冬期外部性状进行了观察研究.结果表明,5个品种中高山桉耐寒性最好,河红桉具有极强的速生性.根据冻害等级调查及不同受害等级所占的比例,计算不同品种的耐寒指数,得出高山桉为耐寒品种,耐寒指数1.667,铁皮桉为中耐寒品种,耐寒指数为1.952,河红桉为轻耐寒品种,耐寒指数为3.113,而维省蓝桉和悉尼蓝桉为不耐寒品种.更多还原

【Abstract】 A research was conducted on the growth index,photosynthenic index and external characters at overwintering of five species of Eucalyptus seedling in Zhengzhou City.The results showed that Eucalyptus dalrympleana had the strongest cold-resistant ability,and E.camaldulensis grew most fleetly.Based on the investigation of the level of freezing harm and the proportion of different level,index of cold-resistance(ICR) of five species were calculated.The results of calulation showed E.dalrympleana had the first-rate coldresistant ability,while E.sideroxylon the secondary ability,and E.camaldulensis the low ability.On the other hand,E.globules and E.saligna were non-cold-resistant species.更多还原