5种珍贵树种造林生长效果分析

The Analysis on the Afforestation Effects of Five Precious Tree Species

通过调查香樟、观光木、深山含笑、天竺桂、红豆树5种珍贵树8a生林分,结果表明,5种树种的保存率相差不大,为92.7-95.3%,但树高、胸径差异显著,观光木树高、胸径最大,分别为8.03m和8.57cm,红豆树最小,分别为6.8m和6.97cm,蓄积量的大小与胸径、树高、冠幅一致,依次是观光木>香樟>深山含笑>天竺桂>红豆树。郁闭度随着林木冠幅的增加而增加,大小顺序与蓄积量一致。说明林分的营养空间大,林木生长快,单位面积产量高,林分茂密,可通过抚育措施提高单位面积的产量。

Based on the investigation on the 7-year-old five precious tree species, Cinnamonum camphora, Michelia odora, Michelia maudiae, Cinnamomum japonicum and Ormosia hosiei, the results showed the survival rates of the five species were not significant difference, ranging from 92.7% to 95.3%. There were significant differences in tree height or DBH among the five species. The tree height and DBH of M. odora were the biggest, with 8.03 m and 8.57 cm, respectively, whereas the tree height and DBH of O. hosiei were the smallest, with 6.8 m and 6.97 cm, respectively. The stand volume was in accord with the growth of DBH, tree height and crown diameter, and the order was M.odora〉 C. camphora〉M. maudiae〉C. japonicum 〉O. hosiei. The canopy density increased with the increase of crown diameter, in accord with the stand volume. This indicated the tree grew quickly and the yield per unit area was high while the nutrient space was big and the stand was in high density, i.e. the yield per unit area could increase by tending measure.