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油橄榄属常绿阔叶树种,抗寒性比较强,一般品种在正常情况下能忍耐-8～-10℃的低温,有的品种在-12～-15℃的低温下,也不会出现冻害。但油橄榄在幼苗期,由于植株小,营养物积累少,木质化程度差,却容易发生冻害。我省汉中地区自1962年引种以来,油橄榄幼苗每年冬季都有轻微冻害。1975和1976两年的冬季连续低温,汉中盆地几个苗圃幼苗冻害极为严重,造成种苗缺乏,直接影响油橄榄的发展。为了研究油橄榄幼苗期冻害发生规律,总结群众防冻经验,我们在1976～1978年,对汉中地区主要油橄榄育苗场的油橄榄冻害进行了调查,现将调查结果整理如下:
Olive is a evergreen broad-leaved species, cold resistance is relatively strong, the general varieties under normal circumstances can tolerate -8 ~ -10 ℃ low temperature, and some varieties at -12 ~ -15 ℃ low temperature, will not appear frost damage. But olive seedlings, due to small plants, less nutrients accumulation, the degree of lignification is poor, but prone to frost damage. Hanzhong since the introduction of our province in 1962, olive seedlings every winter have a slight frost damage. The continuous low temperatures in winter in 1975 and 1976, the cold damage of seedlings of several nurseries in the Hanzhong Basin were extremely serious, which caused the lack of seedlings and directly affected the development of olive. In order to study the law of Olive seedling frostbite and summarize the experience of the masses, we conducted a survey on the frostbite of Olive in the main olive seedling nursery in Hanzhong from 1976 to 1978. The survey results are summarized as follows: