矮林作业的伐桩时间和留桩高度对芳樟生长及精油产量的影响

Effect of felling time and stump height of coppicing on growth and essential oil production of Cinnamomum camphora ct.linalool

以2年生芳樟为试验材料,研究了矮林作业的伐桩时间和留桩高度对其萌芽数、萌枝数、地径、萌枝长度、生物量、出油率等的影响。不同伐桩时间,芳樟萌芽数、地径生长量有显著差异,萌枝数、萌枝长度、冠幅、单株总鲜重、单株叶鲜重、单株小枝鲜重、单株主枝鲜重差异不显著;不同伐桩时间,叶片、小枝、主枝出油率差异不显著,但单株精油产量有显著差异,1月底伐桩单株精油产量最高。留桩高度对芳樟生长和精油产量有显著影响。芳樟的萌芽数随留桩高度的增加先增加后减少,留桩20 cm萌芽数最多,各处理之间萌枝数差异不显著;地径随留桩高度的增加而降低,而萌枝长度和冠幅随留桩高度的增加先增加后降低,留桩20 cm萌枝长度和冠幅最大;单株总鲜重、单株叶鲜重、单株小枝鲜重和单株主枝鲜重随留桩高度的增加先增加后降低,留桩20 cm生物量最大。各处理之间叶片出油率差异不显著,但单株精油产量差异显著,留桩20 cm单株精油产量最高。

Taking 2-year-old Cinnamomum camphora ct.linalool as test material,the germination number,sprout number,ground diameter,sprout length,biomass and oil yield were studied at different felling time and stump height of coppicing of C.camphora ct.linalool.The results show that there were significant differences in the germination number and ground diameter,but few significant differences in the sprout number,sprout length,crown,fresh weight per plant,leaf fresh weight per plant,branchlets fresh weight per plant and main branches fresh weight per plant at different felling time of C.camphora ct.linalool dwarf forest.There was no significant difference in oil yield of leaves,branchlets and main branches,but there was significant difference in essential oil production per plant at different felling time of C.camphora ct.linalool dwarf forest,and the essential oil production per plant reached the highest when felling time was the end of January.The growth and essential oil production were significantly affected by stump height of C.camphora ct.linalool dwarf forest.The germination number increased first and then decreased with stump height,the germination number was the most when stump height was 20 cm,but the sprout number had no significant difference among the treatments.The ground diameter decreased with stump height,the sprout length and crown first increased and then decreased with stump height,and the sprout length and crown reached the largest when stump height was 20 cm.The fresh weight per plant,leaf weight per plant,branchlets weight per plant and main branches weight per plant increased first and then decreased with stump height,and the biomass reached the largest when stump height was 20 cm.There was no significant difference in leaf oil yield among the treatments,but there was significant difference in essential oil production per plant,and the essential oil production per plant reached the highest when stump height was 20 cm.