Assessment on Landscape Quality of Common Vegetation Community in Beijing Suburban Parks by Grey Relation Method

In order to evaluate landscape quality of vegetation community，twentyone appraisal indexes were selected and analysed by method of the factoranalysis weight. The weight coefficients varied from 0018 4 to 0084 6 and the highest weight coefficient was color richness（0084 6），while the lowest weight coefficient was herb height（0018 4）. Landscape quality of sixteen vegetation communities in five Suburban Parks of Beijing was evaluated by gray relational analysis method. The result showed that the correlation degrees varied from 0440 4 to 0663 3. Populus tomentosa+Fraxinus chinensis Comm.（γ=0663 3），Ginkgo biloba Comm.（γ=0629 6），Populus tomentosa Comm.（γ=0624 6） and Robinia pseudoacacia Comm.（γ=0564 5） were the closest to the ideal vegetation community, while Eucommia ulmoides Comm., Salix matsudana and Pinus tabuleeformis Comm. were the worst.