Abstract: The remnant vegetation in the isolated island-liked mountain fragment of conservation area of the Shanghai Chenshan Botanical Garden was inventoried to examine the features of species composition, flora composition, community structure, and species diversity after nearly five decades succession. There were only 94 vascular plant species, belonging to 50 family and 75 genera. The dominant species in the communities were deciduous broadleaf species Liquidambar formosana, Robinia pseudoacacia, Ailanthus altissima, Acer buergerianum, and Celtis sinensis, evergreen broadleaf species Cinnamomum camphora and Elaeocarpus glabripetalus, and Phyllostachys heterocycla. Robinia pseudoacacia+Cinnamomum camphora community had the highest Shannon-Wiener index (H) (1757) and Phyllostachys heterocycla+Acer buergerianum community had the highest Simpson index (D) (0163), but no consistency was observed between the curves of H and D. For vertical structure, most communities had no significant understory stratification. The regeneration insufficiency, development inadequacy, and low ecosystem stability in remnant forest were due to the lack of seedling recruitment by long-term isolation as well as the local and entire changes of the mosaic structure by human activities. It was suggested that deciduous broadleaf forest could be induced into evergreen and deciduous mixed forest through utilizing the suitable understory condition by introducing zonal evergreen species such as Castanopsis sclerophylla and Cyclobalanopsis glauca.

Key words: Chinese fir stand, Clear cutting land, Control burning land, Soil fertility