关键词: 构树, 群落, 组成, 结构, 城市近郊

Abstract: [Objective] The aim of this study was to know the composition and structure of Broussonetia papyrifera community in the suburban. The results may provide the basic data for the construction of ecological environment and research ideas of similar secondary forest. [Method] B. papyrifera communities, including 20 plots of 10×10 m², were studied by the methods of species composition, floristic characteristic, Raunkiaer frequency law, species richness-relative abundance, vertical structure of community and important values. [Results] ① It could represent the situation of the communities when the sampling area was approximately 2 000 m²; ② There were 51 species in the communities belonging to 29 families and 45 genera, which composition indicated incompactly; meanwhile the dominant family or genus did not exist; ③ The genera of community flora showed that the number of temperate types was greater than that of the tropical types, which mean the plant flora had the characteristics of transition in accord with the location; ④ The Raunkiaer frequency law was A > B > C > D > E in the communities; ⑤ The vertical structure of the communities was simple and the trees of > 7m had a high proportion in the tree layer; ⑥ The species important values showed that B. papyrifera(51.83%) and Rosa multiflora(23.63%) were the dominant species in the tree layer and in the shrub layer, respectively. [Conclusion] B. papyrifera community was one kind of unstable forest types, which had the tendency of differentiation and evolutionary. Because B. papyrifera community can adapt the environments strongly, which is very important to the urban ecology. It is worth of exploiting.

Key words: Broussonetia papyrifera, community, composition, structure, suburban