肇庆九龙湖水源涵养林黑桫椤群落植物物种多样性研究

Plant species diversity of Gymnosphaera podophylla community in Jiulong Lake Water-conservation Forest,Zhaoqing city,Guangdong Province

以肇庆九龙湖水源涵养林黑桫椤群落的代表样地调查资料为基础,研究九龙湖水源涵养林黑桫椤群落不同样地、不同层次的植物物种丰富度、物种多样性指数和群落均匀度。结果表明:在群落垂直结构中,乔木层物种多样性的各项指标除物种丰富度以外,其他指标都是最小的,灌木层物种多样性的各项指标除Pielou均匀度指数以外,其他指标都是最大的。各样地间多样性指数测值变幅不大,物种多样性在群落不同层次的变化规律为:灌木层>草本层>藤本>乔木层。人为因子的干扰对黑桫椤群落的物种多样性有较大的影响。

On the basis of field investigation, the species richness, species diversity index and community evenness in different plots and layers of Gymnosphaera podophylla community at Jiulong Lake Water-conservation Forest were studied. The results showed that in the community vertical structrue, the species diversity indexes of tree layer were the lowest except the species richness, and the species diversity indexes of shrub layer were the oiggest except the evenness. The variation patterns of species diversity of Gymnosphaera podophylla community were similar among the different plots. The order of the magnitude of species diversity was ： shrub layer 〉 herb layer 〉 vine 〉 tree layer. The species diversity of Gymnosphaera podophylla community was greatly influenced by artificial factors.