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本文论述湖南现有的经历过多次强低温冰冻而保存下来的赤桉 EucalptusCanaldulansis Dennhardt 群体中,以个体的耐寒性为选择基础,根据个体的自然强低温冰冻的生态反应划分耐寒等级,区别立地条件划分生长量选择标准,初选优树309株。然后利用其后(1991年12月)出现的湖南本世纪以来最严重的低温冰冻气候,检验初选个体的耐寒力,复选89株。又对复选植株和其部分植株的子代林进行4个冬季的观测,于1996年2～3月对复选植株进行耐寒生理测定。共选出赤桉耐寒优良个体74株,初步建立起湖南赤桉耐寒良种基础育种群体,依据个体的耐寒生理指标,从中选出最优良的个体33株,作为耐寒良种的核心育种群体,并均已转化为无性系开始在育种和生产上利用。
This paper discusses the current cold hardiness of Hunan EucalptusCanaldulansis Dennhardt, which has survived many strong low temperature freezing for a long time. Based on the cold tolerance of individuals, the grade of cold tolerance is divided according to the individual’s natural cold and freezing reaction, Divided growth selection criteria, 309 primary trees. Then, using the most severe low-temperature freezing climate in Hunan since the late December this year, 89 cold-sensitive individuals were tested for their cold hardiness. In addition, 4 winter observations were made on the offspring of the selected plants and some of their plants, and the cold-tolerant physiological tests of the selected plants were conducted from February to March 1996. A total of 74 elite individuals were selected for cold hardiness. Eucalyptus chinense population was initially established and 33 elite individuals were selected as the core breeding population of cold tolerant elm. Has been transformed into clones began to use in breeding and production.