The planting site,size,and health condition of street tree Ginkgo biloba in Beijing urban area were investigated and the influence factors were analyzed based on filed survey.The results showed that G.biloba were mainly planted in tree pit within strip planting median.The average height,diameter at breast height and canopy diameter were 8.11 m,13.22 cm and 4.07 m,respectively,82.9％ trees were less than 10 m in height,and most G.biloba trees were still in the initial stage of height and diameter increment.The tree health status was described with three classes:class Ⅰ (healthy),class Ⅱ (fair) and class Ⅲ(unhealthy).The percentage of class Ⅰ,Ⅱ and Ⅲ for G.biloba trees in Beijing urban area accounted for 16.0％,37.2％ and 42.9％ respectively.The results of analysis showed that the health status of G.biloba was associated with the site condition,tree size and management practices.The trees planted in urban forest patch grew better than the trees planted in green belts and tree pits;meanwhile,the bigger trees were healthier than the smaller ones.In addition,the effects of urban heterogeneous environment and human activities on the health of Ginkgo biloba were analyzed and the suggestions on management were launched.
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