桉树扦插苗与组培苗造林生长状况比较

A Study on the Comparative Growth Eucalyptus Cuttings and Tissue Culture Propagules

在相同立地条件下,对尾巨桉DH32-29扦插苗与组培苗进行造林1.5 a和2.5 a后的生长状况对比研究,结果表明:不同苗木类型在树高、胸径、枝下高、冠幅、树高变异系数等均无明显差异(P>0.05);在林木胸径变异系数、保存率和蓄积量方面存在显著差异(P<0.05),3个生长指标的结果表明:用组培苗造林在投入产出及林木生长量上优于扦插苗造林,组培苗造林增加的450元?hm-2成本,在2.5年生林木产出的价值中可数倍回收,投入产出比达4.08:1。

A field trial was conducted to examine the growth of rametes of the clone DH32-29 propagated as rooted cuttings compared to those propagated by tissue culture. At 1.5 and 2.5 years after planting there were no significant differences （P〉0.05） between the two types of plants for tree height, DBH, height to the first branch, crown diameter, or for the coefficient of variation for tree height, but there were significant differences （P〈0.05） for the coefficient variation for tree DBH, survival rate and individual tree volume. The results showed that tissue culture propagules were obviously superior to rooted cuttings for the latter three traits. The value of the marginal increase in volume was estimated to be several times that of the increased marginal cost of RMB 450 per hectare incurred for plantations established with tissue culture propagules, rather than rooted cuttings, and the ratio of input and output was up to 4.08：1.