广州白云山常绿阔叶林的结构特征

Structural Characteristics of the Evergreen Broadleaved Forest in Baiyunshan, Guangzhou

在线路调查和样方调查的基础上分析了广州白云山常绿阔叶林的结构特征。群落主要由亚热带科属组成 ,优势科为芸香科、五加科、茜草科、山茶科、壳斗科、鼠刺科、樟科等。优势树种也以相应的优势科属树种为主。群落中胸径≥ 3cm的个体密度较小 ,只有 196 4株 / hm2 ;群落较为低矮 ,平均高度只有 6m;乔木垂直分化不明显 ,树种水平分布不均。白云山的植被是次生植被和人工造林改造的结果 ,只在山谷少数植被没受人类干扰 .其现状植被是天然次生植被和人工植被的混合体。在一些由马尾松发展起来的群落 ,天然侵入的阔叶树种已在主要层中居优势 ;群落中可见马尾松衰退的痕迹。

Structural characteristics of the evergreen broadleaved forest in Baiyunshan Scenic Spot, Guangzhou, were analyzed based on plot sampling. With an evergreen physiognomy, the forest communities consist mainly of the subtropical families and genera. Dominant families are Rutaceae, Araliaceae, Rubiaceae, Theaceae, Fagaceae, Escalloniaceae and Lauraceae,Which are also from the dominant families and genera. Tree density with DBH≥3 cm is only 1 964 individuals per hm 2. The forest community is relatively dwarf, with an average height of 6 m. Vertical tree stratification is not apparent, and their horizontal distribution is uneven. The vegetation of Baiyunshan is a combination of natural forest and silvicultural rehabilitation. The intruding broadleaved species have dominated over the community formerly dominated by Pinus massoniana, which show a tendency to recede in the vegetation.