Study And Assessment On The Artificial Plant Community In Urban Spaces Of Shanghai City

Urban green space, as the green infrastructure of city and crucial part of city ecosystem, play an important role in improving urban living environment and maintaining ecological balance, urban green space is mostly made up of three ypes landscapes: artifical plant forest, natural vegetation and semi-natural vegetation. The function and structure of green space are based on special types of plant community. Therefore, plant community which is the essential unit of the urban green has an influence on the function of urban-green space system by its structure and species component, and furthermore, it shows us the characteristcs of urban vegetaiton and city green culture. Thus it can be see the tpye and function of plant community would be an impotant issue to which government and research department play attention.Shanghai has constructed urban green space from middle period of 20 century, and great progresses have been made. In 2003, it was awarded garden city for its beautiful living enviroment. In this paper, we did research on types and characteristcs of plant communities in urban green, and established the classification system of plant communities in Shanghai urban-green space. On the base of comprehensively research on urban green space in Shanghai urban area, an indices system was built by using the methods of Stratified analysis and Delphi. Some useful results are give as follows:1. After 489 green communities have been investigated in 63 green spaces, six vegetation type groups, seventeen vegetation types and 184 main plant formations were classified according to the vegetation classification system of "Chinese vegetation": vegetation type group, vegetation type, vegetation subtype, plant formation, plant association.2. On the one hand, the plant community tpyes are more abundance than which in natural forest. Deciduous broad-leaved forest and evergreen and deciduous broad-leaved forest are the main types of the artificial vegetation in Shanghai urban area. Although the appearance frequency of evergreen broad-leaved forest is high, its type is lacking, form. Cedrus deodara, form. Magnolia grandiflora and form. Ligustrum lucidum are the main tpyes of EBF. On the other hand, owing to lack of regional plant communities, the urban green can't present a local characteristcs of natural vegetation of Shanghai. Some regional plant community types, such as Cyclobalanopsis glauca community, Castanopsis sclerophylla community and...