Abstract: Through analysis the mangrove community structure characteristics in different restoration modes, it provides a scientific basis for the implementation of pond-to-mangrove. Using natural mangrove forest as a control, the effects of three restoration models, artificial pond-to-mangrove, artificially assisted pond-to-mangrove and namely natural restoration in Dongzhaigang National Nature Reserve of Hainan were compared from the perspective of species composition, community structure and species diversity. After 25 years of restoration, the results showed that,there were 16 species of mangrove plants in the study area, the communities after artificial assisted restoration were more similar to the natural forest communities. The community structure of the three restoration models was well developed, and the distribution of the dominant species was Aegiceras corniculatum, Bruguiera sexangula, and Sonneratia apetala. The natural regeneration potential of each model community was high, while the seedlings of Bruguiera sexangula and Aegiceras corniculatum were well renewed. In the context of community development, the area of pond-to-mangrove would renew and succession in the direction of the native species such as Bruguiera sexangula and Aegiceras corniculatum. From the perspective of the species diversity index, the species richness, community complexity, and the homogeneity of community plant numbers in both artificial pond-to-mangrove and artificially assisted pond-to-mangrove were higher than those in the namely natural restoration and the natural forest. According to the site conditions, artificially assisted pond-to-mangrove can be chosen first in the project to speed up the process of mangrove vegetation restoration and increase the diversity of community species to quickly rebuild the good mangrove wetland ecosystem.

Key words: Dongzhaigang, Mangrove forest, Returning ponds to forest, Community characters, Ecological restoration