邓恩桉人工林幼林生长规律

The growth rhythm of young plantations of Eucalyptus dunnii

邓恩桉是一种抗寒性良好的速生树种。对建阳市不同代表性地段邓恩桉幼林(年龄在1-3 a)生长规律进行了研究。结果表明:邓恩桉幼林个体间的生长差异较大,3年生的幼林的胸径最大值与最小值分别为15.4和1.2 cm,树高最大值和最小值分别为15.8和2.6 m。1-2龄的邓恩桉生长迅速,胸径平均超过3.8 cm,树高平均超过4.2 m。不同立地条件下,阳坡的幼林长势相对较好。

Eucalyptus dunnii Maiden is a kind of fast-growing tree species with good cold resistance. The young plantation growth rhythm was studied based on investigating E. dunni young plantations （ the average age was between 1 and 3） in different places in Jianyang. The results showed that the growth difference among young ones of E. dunni was big. For example, the maximum and minimum value of 3 years-old trees＇ diametere breast height（DBH） was 15.4 and 1.2 cm, respectively as the maximum and minimum value of tree height was 15. 8 and 2. 6 m, respectively. From the first to the second year, the young trees grew fast, as the DBH was over 3.8 cm and the tree height was over 4. 2 m averagely. Moreover, the young trees grew well on sunny slopes comparatively.