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桉树是热带、亚热带速生树种之一,只要外界条件合适,就没有明显的休眠期。在自然分布区外,引种的桉树一旦适应了新的生态环境,便显出它生长迅速的特点~([1])。不同种桉树,对于环境条件如温度、雨量、土壤及阳光等要求是不同的。上海地处北纬31°10′,东经121°26′,海拔4.5米,气候属亚热带北缘,全年平均气温为16.4℃,历史上最低气温曾达-12.1℃(1893年1月19日),平均全年降雨量为1143.4毫米,土壤为粘性壤土,偏碱,pH为7.0—7.8。分析诸因素,上海地区要发展桉树,关键是解决低温对桉树的冻害影响。
Eucalyptus is one of the tropical and subtropical fast-growing tree species. There is no obvious dormant period as long as the external conditions are right. In the natural distribution area, introduced eucalyptus once adapted to the new ecological environment, it shows its rapid growth characteristics ~ ([1]). Different types of eucalyptus, for environmental conditions such as temperature, rainfall, soil and sunlight and other requirements are different. Shanghai is located at 31 ° 10 ’north latitude, 121 ° 26’ east longitude and 4.5 meters above sea level. The climate belongs to the northern margin of the subtropical zone. The annual average temperature is 16.4 ° C. The lowest temperature in history reached -12.1 ° C (January 19, 1893) , The average annual rainfall of 1143.4 mm, the soil is sticky loam, alkaline, pH 7.0-7.8. Analysis of various factors, the development of eucalyptus in Shanghai, the key is to solve the cold damage of eucalyptus on the impact of freezing.