珍贵树种多树种混交造林效果

对6年生珍贵树种多树种混交林生长情况进行调查,结果表明：与格木（Erythrophleum fordii）＋柚木（Tectona grandis）混交林、格木纯林以及降香黄檀（Dalbergia odorifera）纯林相比,多树种混交林总蓄积量能提混高13.66-49.14 m^3/hm^2,不同树种以及同一树种在不同配置模式之间的平均树高、平均胸径、平均单株材积及其年均生长量等指标差异显著。多树种混交模式中格木、降香黄檀的平均树高分别比相应纯林提高2.33%-30.23%和10.71%-19.64%,平均胸径分别提高了15.15%-27.27%和12.50%-20.83%。与格木＋柚木混交林相比,多树种混交林格木、柚木平均树高分别提高了8.70%-21.74%和8.70%,平均胸径分别提高了24.59%-37.70%和33.33%-36.46%。综合分析表明,珍贵树种多树种混交在一定程度上能够提高格木、降香黄檀、柚木等的高径生长,促进干形发育,且在促进林木胸径生长上有显著作用,该模式对于珍贵树种长周期大径材的培育切实有效,但不同树种配置及其比例的改善效果存在差异。

Mixed Forestation Effect of Multiple Rare Tree Species

By investigating the growth of 6-year-old mixed forest of multiple rare tree species,the results showed that compared with mixed forest of Erythrophleum fordii ＋ Tectona grandis,pure forest of E.fordii and Dalbergia odorifera,the total volume of the mixed forest of multiple tree species could be increased by 13.66 - 49.14 m^3/hm^2.There were great differences in average tree height,average DBH,average individual volume,and annual average growth between different tree species and the same specie with different configuration modes.The average tree height and average DBH of E.fordii and D.odorifera in mixed forest of multiple tree species were higher than those in each pure forest with 2.33% - 30.23%and 10.71% - 19.64%,15.15% - 27.27% and 12.50% - 20.83% respectively.Meanwhile,compared with mixed forest of E.fordii ＋ T.grandis,the average tree height,average DBH of E.fordii and T.grandis in mixed forest of multiple tree species were higher with 8.70% - 21.74% and 8.70%,24.59% - 37.70% and 33.33% - 36.46% respectively.By synthetical analysis,the mixed mode of multiple rare tree species could promote the height growth,stem form growth,and DBH growth of E-.fordii,D.odorifera,and T.grandis evidently.The mode was feasible and effective for big diameter timber cultivation of rare tree species in long period,with different effects in different tree configurations and proportions.