城乡环境梯度下植物群落的区系成分分析

分别以白云山、帽峰山、莲塘风水林作为广州市区、城郊和郊区常绿阔叶林群落代表，分析其植物区系组成和多样性特征。结果显示，广州帽峰山常绿阔叶林群落种类最丰富，维管束植物有87科155属212种，优势科为茜草科、大戟科、樟科、禾亚科、芸香科、紫金牛科、壳斗科；白云山维管束植物有72科121属168种，优势科为茜草科、樟科、桑科、禾亚科、大戟科、冬青科；而莲塘风水林森林群落有55科88属102种，优势科为茜草科、樟科、大戟科。从属的地理分布区类型来看，三个群落皆以泛热带分布属的比例最高，其次为旧世界热带分布属和热带亚洲分布属，群落缺乏典型的热带成分，但具有南亚热带植物区系的基本特征。其中白云山的东亚分布类型有3属；帽峰山的东亚分布类型有4属，中国特有分布类型有1属；而莲塘风水林则没有东亚分布和中国特有分布类型。

Floristic Analysis of the Evergreen Broadleaved Forest Community along an Urban-Rural Gradient in Guangzhou

Floristic composition of the evergreen broadleaved forest in Maofeng Mountain, Baiyun Mountain, and Liantang, as an urban-to-rural gradient of Guangzhou, was analyzed based on community data. The results indicated that the community in Maofeng Mountain was the richest in species diversity, with 87 families of vascular plants including 155 genera and 212 species, dominant families of the flora were Rubiaceae, Euphorbiaceae, Lauraceae, Agrostidoideae, Rutaceae, Myrsinaceae, and Fagaceae. Vascular plants in Baiyun Mountain plot consisted of 168 species, belonging to 72 families, and 121 genera. Dominant families of the flora were Rubiaceae, Lauraceae, Moraceae, Agrostidoideae, Euphorbiaceae, and Aquifoliaceae. However, Liantang community included only 55 families, 88 genera and 102 species. Dominant families of the flora were Rubiaceae, Lauraceae, and Euphorbiaceae. As for generic distribution, the pantropic areal-type represented the majority of genera, followed by old world tropics and tropical Asia, while typical genera were rare and showed the basic features of lower subtropical flora in these three communities. There were three genera of E. Asia in Baiyun Mountain, four genera of E. Asia and one genera of endemic to China in Maofeng Mountain.