广西植物2011，Vol.31Issue(1)：75-80,6.DOI:10.3969/j.issn.1000-3142.2011.01.016
不同林龄巨尾桉的灰分含量和热值
Ash contents and caloric values of Eucalyptus grandis ×Eucalyptus urophylla in different stand ages
摘要
Abstract
Ash contents and caloric values of leaves,branches, roots,stem-wood and bark of 1-4 years old Eucalyptus grandis × Eucalyptus urophylla were determined by using calorimeter and muffle furnace. The results showed that the ash contents of five parts ranged from (0. 42±0. 14)％ to (4. 43±1.35)％ with the highest in bark and the lowest in stem-wood,the decreasing orders of them at different stand ages were not in the same way and were irregular,there were significant different in ash contents of leaves,branches,stem-wood and bark except roots at four stand ages(P＜0. 05).Mean gross caloric values (GCV) and ash free caloric values (AFCV) of different parts ranged from (17. 24±0. 31) to (20. 58±0. 34)kJ · g-1 and (18. 04±0. 22) to (21.44±0. 37)kJ · g-1 respectively,the distribution law of them at different stand ages were quite different from component to component with leaves having the highest GCV and AFCV and bark the lowest. The differences among stand ages in GCV of leaves, branches,roots and AFCV of leaves,roots,bark were not significant (P＞0. 05), but making obvious differences in stem-wood and bark's GCV, branches and stem-wood's AFCV (P＜0. 05). As to the whole tree,4-year-old Eucalyptus grandis × Eucalyptus urophylla had the highest ash content which was 2. 76％ ,while the 2-year-old tree had the highest GCV and AFCV which was 19. 06 kJ · g-1 and 19. 53kJ · g-1. To whole tree,the differences in ash content and colaric value were not obvious(P＞0. 05).关键词
林龄/巨尾桉/灰分含量/热值Key words
stand age/ Eucalyptus grandis × Eucalyptus urophylla / ash content/ colaric value分类
农业科技引用本文复制引用
周群英,陈少雄,韩斐扬,陈文平..不同林龄巨尾桉的灰分含量和热值[J].广西植物,2011,31(1):75-80,6.基金项目
中央级公益性科研院所基本科研业务费专项(CAFINT2008C13) （CAFINT2008C13）
