采用样方调查法,对清新县白湾镇石灰岩次生林的群落组成和植物多样性进行研究.在10个面积为400 m2的调查样方中,共记录维管植物151种,隶属61科119属.植物属的地理成分分析结果表明,79％的种子植物属为热带分布类群,以泛热带成分最为丰富(占34％),其次为旧世界热带和热带亚洲分布类型(均为16％)；温带成分仅占19％.物种多样性分析结果表明,物种丰富度以草本层最丰富,其次为灌木层,乔木层较低；Simpson指数(D)和Shannon指数(H')均以灌木层较高,草本层次之,乔木层较低；均匀度指数(E)以灌木层较高,乔木层次之,草本层较低.任豆Zenia insignis、阴香Cinnamomum burmannii、菜豆树Radermachera sinica、海红豆Adenanthera microsperma、朴树Celtis sinensis、麻楝Chukrasia tabularis、橙木Loropetalum chinense、千里香Murraya paniculata和小芸木Micromelum integerrimum等在风水林中生长良好,可应用于石灰岩山地的植被恢复.%Floristic composition and species diversity of Baiwan Fengshui woods in the limestone region of Qingyuan City, Guangdong were studied by plot method. A total of 151 vascular plants were recorded in the 10 plots with an area of 400 m . They belong to 61 families and 119 genera. Among the 100 non-cosmopolitan genera, 79% are tropical distribution elements. They are dominated by pantropic elements. There were also higher percentage of old world tropic and tropic Asian elements. The results showed that there was the highest species richness in herbal layer, followed by shrub layer, and the lowest one in tree layer. There were the highest Simpson and Shannon indices in shrub layer, followed by herbal layer, and the lowest one in tree layer. Evenness was the highest in shrub layer, followed by tree layer, and the lowest one in herbal layer. Zenia insignis, Cinnamomum burmannii, Radermachem sinica, Adenanthera mi-crosperma, Celtis sinensis, Chukrasia tabularis, Loropetalum chinense, Murraya paniculata, and Microme-lum integerrimum were found to grow well in Fengshui woods. They can be used in rehabilitation of degraded limestone areas in Qingyuan City and even in other subtropical areas of Guangdong Province.
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