邓恩桉和巨尾桉在桂西北高海拔地区的生长表现

摘要

为了探明高海拔地区引种桉树的生长状况，在桂西北900~930m的地段上引种邓恩桉和巨尾桉，分别对其生长调查和经济效益分析，结果为：6年生邓恩桉和巨尾桉的平均胸径分别为18.53 cm和17.83 cm；平均树高分别为22.12m和24.03m；林分平均蓄积量为227.82 m3·hm-2和217.62 m3·hm-2；年平均纯收入分别为20998元·hm-2和19980元·hm-2。研究结果充分说明，在桂西北高海拔地区引种邓恩桉和巨尾桉，具有速生、高产和显著的经济效益，应值得推广。%In order to investigate the growth performance ofEucalyptusinhigh altitudeareas,plantingsof EucalyptusdunniiandEucalyptus grandis×E.urophyllawere established at a site of 900~930maltitude in northwesternGuangxi. The results were as follows: average DBHs of 5-year-oldE. dunniiandE. grandis×E. urophyllatrees were 18.5 cm and 17.8 cm respectively; average heights were 22.1m and 24.0m and standing volumes were 227.8 m3·hm-2and 217.6 m3·hm-2. The average net profit calculated for stands of each species wereRMB20 998 yuan·hm-2·yr-1andRMB19 980 yuan·hm-2·yr-1respectively. The results showed that introducingE.dunniiandE. grandis×E.urophyllainhigh altitudeareas of northwesternGuangxi promises fast growth, high yields and high economic profits. Therefore, these species could be considered forplanting on larger, commercial scales in such environments.