In this research,the typical sample method was adopted to collect samples in forest communities of Yushan,Changshu.Based on different indictor species of tree layer,the communities were classified into eight types using data from 22 quadrats by TWINSPAN.CommunityⅠ～Ⅶ were natural communities composed of native plants,most of which were in the medial and later stage of succession,with the zonal or partially zonal characteristics of vegetation,such as Ass.Cyclobalanopsis glauca+ Liquidambar formosana-Gardenia jasminoides + Symplocos paniculata-Lophatherum gracile.With Pinus elliottii as the dominant species of tree layer,Community Ⅷ was semi-natural plant community which derived from planted forests,and had no zonal characteristics.By means of analyzing internal structures and external characteristics of the communities,the seven natural plant communities were simulated and thus 15 models of planting design for urban open green space were formed for guiding the construction of plant communities in urban open green space.This research could provide a basis for planting design with a variety of seasonal plant landscape in Changshu,and supply reference information for simulating natural plant communities in other areas as well.
