Abstract: Spatial structure to a large extent discloses the habitat of individual trees in a community and the quota of environmental resources they have. It is very important for maintaining the stability of plant community, and for analyzing interspecific competition and individual survival. In this study, a plot of 65 m×40 m with every tree positioned was established in the coastal zone of Fangchenggang, Guangxi Province, with the purpose to detect the spatial characters of natural Syzygium hancei Merr. et Perry community. The whole plot and trees with different sizes were analyzed by the bivariate distribution of structural parameters. The results showed that S. hancei population had a distinct advantage in both biomass and the number of individuals when compared with other species. Simultaneously, most individuals were randomly distributed and lowly mixed, regardless of the whole community, big or small trees. Only few trees belonged to high mixture, regular or cluster distribution. For the whole plot, trees with different superiority had a similar mixture and distribution pattern. Most big trees were in a superior status and low mixture, only a few belonged to middle or inferior trees. Almost all small trees were inferior individuals with low mixture, and they were in a state of random distribution and disadvantage at the same time. These features revealed that the community had a very complex structure and may be in a stable state. Our results could be beneficial to the protection and restoration of S. hancei community, and also provide a reference for the construction of structure system of protection forest in the coastal zone.

Key words: soil microorganism, soil enzyme, saline soil, vegetation restoration, canonical correspondence analysis, path analysis