对广东省东莞市樟木头林场5种6a生巨桉（Eucalyptus grandis）、柳桉（E.sdigna）、大花序桉（E.cloeziana）、粗皮桉（E.pellita）和托里桉（E.torelliana）的能量特征进行研究。结果表明：5种桉树不同组分的灰分含量和热值存在显著差异（P〈0．01）。灰分含量为0．16％～8．37％，其中巨桉、柳桉、粗皮桉和托里桉均是叶〉皮〉枝〉根〉干，而大花序桉为皮〉叶〉枝〉根〉干；各组分的干重热值为15．12-18-85kJ g^-1，均以叶最高、皮最低，巨桉与粗皮桉为叶〉枝〉干〉根〉皮；柳桉与托里桉为叶〉干〉枝〉根〉皮；大花序桉为叶〉枝〉根〉干〉皮；去灰分热值为16．37～19．87k Jg^-1，除粗皮桉为叶〉枝〉皮〉干〉根外，其它4种各组分的去灰分热值均与干重热值的变化趋势相同。5种桉树的平均干重热值和去灰分热值分别以巨桉、粗皮桉最高，但均以托里桉最低。
Energy characteristics of 6-year-old trees of Eucalyptus grandis, E. saligna, E. cloeziana, E. pellita and E. torelliana in Zhangmutou Forest Farm in southern Guangdong Province were studied. The results showed that there were significant differences in ash content and caloric value of various above and below ground components （P 〈0.01）. Ash contents ranged from 0.16% to 8.37%, with the components in E＇ grandis, E. saligna, E. pellita and E. torelliana had order as leaves 〉 bark 〉 branches 〉 roots 〉 stem-wood, and that in E. cloeziana as bark 〉 leaves 〉 branches 〉 roots 〉 stem-wood. Gross c aloric values （GCV） of various components ranged from 15.12 to 18.85 kJ g^-1 with leaves having the highest GCVs and bark the lowest. For E. grandis and E. pellita, the order of components was leaves 〉 branches 〉 stem-wood 〉 roots 〉 bark, for E. saligna and E. torelliana was leaves 〉 stem-wood 〉 branches 〉 roots 〉 bark and for E. cloeziana leaves 〉 branches 〉 roots 〉 stem-wood 〉 bark. Ash free caloric values （AFCV） of components ranged from 16.37 to 19.87 kJ g^-1 and the order of components by AFCVs were the same as those for GVCs for E. grandis, E. saligna, E. cloeziana and E. torelliana, and that for E. pellita as leaves 〉 branches 〉 bark 〉 stem-wood 〉 roots. For whole tree, E. grandis and E. pellita had the highest mean GCV and AFCV values respectively, while E. torelliana had the lowest.
Journal of Tropical and Subtropical Botany