增城市主要森林群落植物多样性研究

报道了增城市主要林区次生常绿阔叶林、马尾松林、湿地松林、南洋楹林等4种森林群落的植物多样性。调查了19个400m^2的样方，共记录了163种乔灌木植物种类。除5种未能鉴定外，其余158种分属50科97属，包括2种国家保护植物：穗花杉和白桂木。等级聚类分析和无偏对应分析（DCA）结果显示：次生林群落多样性较高，人工林较低。多样性变化的总趋势为：次生林＞南洋楹林＞马尾松林＞湿地松林。次生林与人工林群落在种类组成和多样性方面有较大的差异，次生林群落的树木种类较丰富，但大多数为早期的先锋树种，原生的地带性森林建群种，如壳斗科、樟科、木兰科等种类很少，而且相当多的次生林种类仅局限于天然林中，很少见于人工林中；人工林中常见的种类大都是那些具有鸟播种实的种类。

Floristic Diversity of Major Forest Communities in Zengcheng City,Guangdong Province

Nineteen 400 m 2 plots, including 7 plots in secondary forest and 4 plots in plantations of Pinus massoniana, P. elliottii and Albizia falcataria , respectively, were surveyed. A total of 163 species were recorded in these study plots, including two national protected species, Amentotaxus argotaenia and Artocarpus hypargyrea . The results of Hierarchy Clustering Analysis and Detrended Correspondence Analysis (DCA) showed similar trend: Secondary forest had the highest diversity, while the diversity of the plantations is relatively lower. Among the plantation communities, Albizia falcataria plantations had the highest diversity, followed by Pinus massoniana plantations, and the lowest is P.elliottii. The species composition and diversity varied among the forest communities. Secondary forests have richer species, but most are early successional pioneer species. The climax species or late successional species such as the species of Fagaceae, Magnoliaceae and Lauraceae are generally rare. Many native species are confined to secondary forest and are seldom to be found in plantations. The native species growing in the plantations are usually well dispersed by birds.