作　　者： ; ; (叶永昌）; (朱剑云）; (刘颂颂）;

机构地区： 华南农业大学林学院

出　　处： 《广东林业科技》 2009年第1期16-22,共7页

摘　　要： 对广东省大岭山桉树、马尾松、马占相思三种人工林进行样方调查,分析了林分结构特征并提出林分改造对策。三种人工林的立木密度分别为1 268,2 232,1 524株/hm2,随着径级的增大,立木数减少。群落种群的频度级分布均为A>B>C>D=E=0。垂直结构明显,层间植物种类多,林下植被丰富。除草本层外乔木层、灌木层和层间植物这三个的Shannon-Weiner多样性指数和均匀度比较接近,而且和自然条件下的广东亚热常绿阔叶林的群落组成结构基本相符。林分结构特征表明三种人工林受到的人为干扰少,林分改造效果较明显,从演替的角度看,这三种林分有向南亚热带常绿阔叶林发展的趋势。 Based on field surveys in Dalingshan, Dongguan, structural characteristics of the three types of forest plantations, i. e., Eucalyptus, Pinus massoniana, and Acacia mangium plantations, were analyzed and the strategies for forest rehabilitation were put forward. The density of individuals （DBH≥3 cm） is 1 268 stems hm^-2, 2 232 stems hm^-2, 1 524 stems hm^-2 in the three plantations, respectively. Number of stems decreased with the increase of DBH. The frequency classes of species in the three communities were A 〉 B 〉 C 〉 D = E =0. The vertical spatial structures of the three plantations showed obvious stratification, with rich understory, interlayer, and sub-layer plant species. With the exception of herbaceous layer, the Shannon-Weiner diversity index and evenness index of arborous layer, shrub layer, and interlayer were close to each other. These results were consistent with those from evergreen broadleaved forests. Stand structure characteristics showed the three plantations experienced little disturbance, indicating significant effects of stand improvement. In light of forest succession, these forest plantations with stand improvement measures showed a trend of development to the zonal subtropical evergreen broa- dleaved forest.

关 键 词： 人工林 林分结构 林分改造

领　　域： [农业科学] [农业科学]