中文摘要：

为了解深圳坝光银叶树群落的结构特征、物种多样性与演替情况以及群落内古树保护现状,采用样带法全面调查了深圳坝光银叶树群落,基于生境特点将群落分成3个不同生境类群,分析了不同生境群落多样性及演替趋势。结果表明：该群落由89个种群组成,隶属于35科73属,其中银叶树种群在乔木层、幼树层和幼苗层的重要值均为最高,阴香、九节、海芒果等也占有较大优势。群落中2.5 m以下的幼树占各种群数量的83.26%,其中78.37%的幼树是银叶树,表明银叶树群落的演替趋势处于＂金字塔＂型的正方向发展。3种生境类型群落多样性指数高低呈现为：邻海陆地生境群落〉远离海岸的陆地生境群落〉滨海沼泽湿地生境群落,随着群落的发展,邻海陆地和远离海岸的陆地生境群落种群的多度将增加,而滨海沼泽湿地生境群落则逐渐衰退。由于人为和自然因素的威胁,坝光银叶树已表现出一些濒危的特征,需加强保护。

英文摘要：

The structural characteristics,species diversity and succession of Heritiera littoralis community in Baguang,Shenzhen were comprehensively investigated by the transect method. The protection status of the ancient trees within this community was also evaluated. Based on the habitat characteristics,this community could be classified into three habitat groups and the diversity and succession tendency of each group were analyzed. Results showed that a total of 89 woody species,belonging to 35 families and 73 genera,were recorded. Among them,H. littoralis had the highest importance values in the arbor,sapling and seedling layers,followed by Cinnamomum burmanni,Psychotria rubra and Cerbera manghas,which also had high importance values.Saplings with a height less than 2. 5 m occupied 83. 26% of total individuals,among which,78.37% was H. littoralis,indicating that the succession pattern of H. littoralis followed the pyramid-like tendency. The community in the habitat group adjacent to sea（ seaward habitat） had the highest diversity index,followed by the habitat group furthest away from sea（ landward terrestrial habitat）,and the coastal marsh wetland habitat group had the lowest value. This finding indicated that as the community developed,the diversity in the first and the last habitat groups would increase,while that in the coastal marsh wetland habitat group would gradually decline. Due to anthropogenic and natural disturbances,H. littoralis in Baguang has already exhibited some endangered signs and more protection is urgently needed.