【摘要】 <正>银杏(Ginkgo biloba Linn.)在北京有着悠久的栽培历史[1]。随着北京城市建设的不断发展,大量的银杏树被广泛应用于城市绿化建设之中,银杏已逐渐成为北京城区的主要行道树种,其使用量已占到了城区乔木行道树总量的7%左右[2-3]。银杏行道树的广泛栽植不仅美化了城市景观,而且在遮荫、降噪、吸污和滞尘等方面也具有十分重要的生态效益。与此同时,城市的异质人工环境也对银杏的健康生长产生了较大影响,近年来,北京城区银杏树频频出现叶色焦枯、树势衰落、甚至植株死亡等现象,更多还原

【Abstract】 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.更多还原