红豆树老林分的群落特征

Community characteristics of virgin forest of Ormosia hosiei Hemsl et Wils

红豆树群落乔木层物种种类相对较少,红豆树、榕冬青、青冈栎、苦槠4个树种在乔木层中占居绝对优势地位,四者是红豆树群落的主要共建种;木荷、朴树、樟树、米槠、广东润楠、南岭黄檀6个树种的重要值分别为4.0、6.1、6.1、3.2、3.1、3.0,在红豆树群落中的生态环境资源的竞争能力相差不大。红豆树在群落中处于乔木上层,为林中霸王木,具有较显著的相对优势度,成林后对光照条件的竞争具有绝对优势。红豆树群落乔木层的垂直层次结构中,上层木为红豆树和米槠,中层木为榕冬青和青冈栎,苦槠、木荷、朴树、樟树、广东润楠、南岭黄檀为下层木。红豆树在群落中的水平层次地位最高,榕冬青、青冈栎、米槠次之。乔木层中处于上层地位的4个树种在灌木层中,其幼树的重要值仍然位居前列,红豆树、青冈栎、苦槠、榕冬青的重要值分别为7.94、5.94、2.57、2.48。可见红豆树群落的自然演替趋势仍然以红豆树、青冈栎、榕冬青、苦槠为主要共生结构,在无干扰状态下红豆树群落能够实现自然更替。

In arbor layer of Ormosia hosiei Hemsl et Wils community, the species are relatively few and O. hosiei, Ilex ficoidea, Cyclobolanopsis glauca, Castanopsis sclerophylla are absolutely dominant, which jointly form the community. The importance values of Schima superba, Celtis sinensis, Cinnomomum camphora, Castanopsis carlesi, Machihu kuangtungensis, Dalbergia hupeana are respectively 4.0, 6.1,6.1,3.2, 3.1,3.0, with insignificant difference in the competitive ability for eco-environment resources in the community. O. hosiei is on upper layer of tree species and has significant relative dominance and absolute advantages in competition for illuminanee in the forest. In the vertical layer structure of arbor layer in O. hosiei community, upper layer trees are O. hosiei and C. carlesi, middle layer trees are I. ficoidea and C. glauca, and lower layer trees are C. sclerophylla, S. superba, C. sinensis, C. camphora, M. kuangtungensis and D. hupeana. In the horizontal hierarchy of the community, O. hosiei is the highest, I.ficoidea, C. glauca and C. sclerophyUa are the second. On the arbor layer, the young trees of the four upper layer species still have the importance values listed at the top of the shrub layer, and those of O. hosiei, l..ficoidea, C. glauca and C. sclerophylla are respectively 7.94, 5.94, 2.57 and 2.48. It is proved that the natural sere trend of O. hosiei community still takes O. hosiei, C. glauca, I.ficoidea and C. sclerophylla as main symbiotic structure, and O. hosiei community can realize natural alternation without interference.