论文部分内容阅读
1973年和1974年,我所引种蓝桉(Eucalyptus globulus),直干桉(E.maideni)等34种桉树,定植后三年,生长正常。其中蓝桉、直干桉、野桉等三种生长迅速的占9％;004号桉,渐尖赤桉、大叶桉、柳叶桉等7种生长中等的占24％;其余生长较慢。但所有引种桉树,以第三年开始,高生长普遍加快。 1975年12月14、15日,昆明地区出现罕见的低温,这两天平均气温分别为-3.8℃和-1.6℃,最低气温分别为-5.4℃和-4.9℃。由于持续低温,造成引种桉树严重冻害,主干大部冻死,只有一种桉树未受冻害。
In 1973 and 1974, 34 kinds of eucalyptus such as Eucalyptus globulus and E.maideni were introduced and grew normally three years after planting. Among them, three kinds of eucalyptus, straight eucalyptus and wild eucalyptus grow rapidly, accounting for 9%. Seven kinds of eucalyptus, such as Eucalyptus 004, Eucalyptus urophylla, Eucalyptus grandis and Eucalyptus grandis are 24% . However, all introduced eucalyptus, the third year, the general growth of high speed. On December 14 and December 15, 1975, a rare low temperature occurred in Kunming. The average temperatures of these two days were -3.8 ℃ and -1.6 ℃ respectively, with the lowest temperatures of -5.4 ℃ and -4.9 ℃ respectively. Due to the continuous low temperature, resulting in the introduction of serious damage to eucalyptus freeze, most of the main freeze to death, only one kind of eucalyptus is not frozen damage.