邓恩桉在福建南平不同海拔区的生长调查

对延平区三乡镇邓恩桉遭遇两次历史低温后生长情况进行调查分析,结果表明不同海拔高度对邓恩桉生长影响显著。邓恩桉新造林对持续的低温很敏感,成林后其耐寒能力大大增强,但海拔较高的地区种植邓恩桉其蓄积量小于当地杉木、马尾松的蓄积量,这与邓恩桉本身的生物学特性有关。邓恩桉在海拔≤260m、土层厚≥80cm的Ⅰ、Ⅱ类缓坡地生长状态好,4a生邓恩桉平均蓄积量达31.8m3·hm-2。

Investigation for the Growth of Eucalyptus dunnii at Different Elevations in Nanping City of Fujian Province

After suffering two times relatively low temperature, the growth of E.dunnii plantations in Sanxiang, Yanping were investigated.The results showed that different altitude influenced E.dunnii growth remarkably , young E.dunnii plantations were very sensitive to continuing low temperature while the old pla ntations had good cold-tolerance , but it’s volume was less than those of lo cal fir and red pine in higher elevation areas. This was related to it’s biolog ical features. E.dunnii grows well on the gentle slopes which are under 260 m el evation and above 80 cm soil horizon. The average volume of four years old E.dun nii plantion was 1.8 m3 ·hm-2.