一、前言兰桉、直干兰桉原产澳洲,五十年代引入,六十年代后在云南省种植范围逐步扩大。经栽培证明,该两树种长势以云南省为优,生长迅速,在一般条件下,十年生平均树高20米左右,胸径14—20厘米,且繁殖容易,适应性强,在云南省各地引种深受广大群众欢迎,目前已成为云南地区及低山丘陵地区主要造林速生树种之一。 First, the foreword Eucalyptus, straight Eucalyptus native Australia, introduced in the fifties, sixty time after planting in Yunnan Province gradually expanded. The cultivation proved that the growth of these two species in Yunnan Province as the excellent, rapid growth, under normal conditions, ten-year average tree height of about 20 meters, diameter 14-20 cm, and easy propagation, adaptability, introduced in various parts of Yunnan Province Popular by the masses, it has become one of the major afforestation tree species in Yunnan and hilly areas.