Community structure and species diversity of Schima superba-Pinus massoniana communities in Dongbaishan Nature Reserve

Floristic composition,species composition,community structure and alpha diversity were preliminarily analyzed based on the statistics data of all free standing trees≥1cm DBH(diameter at 1.3mabove ground)in Dongbaishan(DBS)1hm2 forest plot,Zhejiang Province,China.The result indicates that there are 48 species,36genera and 23 families,5 493 individuals in total after removing withered.The evergreen tree species are dominant(i.e.25 species,total relative dominance is 98.18%,and the importance value is 95.22%,accounting for 96.65% of the total abundance).DBS forest plot has obvious dominant species,occasional species and rare species.Schima superba and Pinus massoniana are the main dominant species.Occasional and rare species account for 35.42% and 20.83% of the species richness,respectively.Temperate elements are relatively more than the tropical elements.Temperate genera and tropic ones account for 52.77% and 44.44% of floristic composition at genus level.Vertical structure is composed of canopy layer(18species),sub-tree layer(27species),and shrub layer(41species).Community is relatively rich in species,and the alpha diversity distributes in the order of shrub layersub-tree layercanopy layer.The structure of DBH size class of all species in the plot generally appears reverseJshape,which indicates successful community regeneration.As the seedling of Pinus massoniana is insufficient,the community type of DBS forest plot might be replaced by Schima superba forest,and grow into a typical subtropical evergreen broad-leaved forest in the future.