湛江特呈岛红树植物群落结构特征

2008年6月,采用样方调查法对湛江特呈岛红树植物群落结构及白骨壤(Avicennia marina)的种群特征进行了全面调查.结果表明:该地区红树林是白骨壤纯林以及白骨壤为主,有红海榄(Rhizophora stylosa)、木榄(Bruguieragymnorrhiza)和桐花树(Aegiceras corniculatum)的混交林.白骨壤在潮滩上连续分布,红海榄、木榄和桐花树生长于近陆林缘及潮滩的中部,物种多样性指数由陆缘向海缘呈降低趋势.通过分析白骨壤种群的株高、地径在潮滩上的变化规律得出年幼的个体聚集于近陆林缘,近海林缘较少.白骨壤种群的年龄结构为增长型,但是根据生境条件及白骨壤种群在海滩上的分布格局,分析得出该红树林资源处于退化的状态.

Characteristics of the community structure of mangrove communities of Techeng Island, Zhanjiang

The structure of mangrove community and the feature of Avicennia marina population of Techeng Island, Zhanjiang was surveyed using sample-quadrat method during June 2008. The results of the investigation showed that:the mangroves in the region are A.marina pure forest, and mixed forest of four species (A.marina, Rhizophora stylosa, Bruguiera gymnorrhiza, and Aegiceras corniculatum) in which A.marina is the dominant species. A.marina distributes continuously on the beach from the landward to the seaward. R.stylosa, B.gymnorrhiza and A.comiculatum grow in the landward and the central of the beach. The species diversity index decrease from the landward edge to the seaward edge. By analyzing the trend of plant height, base diameter of A.marina population, young individuals gathered landward, very little grow seaward. The age structure of A.marina population shows that this population is in growth form. However, according to the environment and the distribution of A.marina population, the mangrove in this area will degenerate in the future.