银杏由于它优美的树冠、奇特的叶片，而在绿化中的应用越来越广，加之其可以带来丰富的经济效益而倍受人们的青睐，因此成为珍贵的园林绿化和经济树种。近年来随着我国城市化建设进程的加快，对大型（胸径８厘米以上）银杏的需求较多。但由于银杏特殊的生物学特性，导致很多地 Because of its gorgeous canopy, peculiar leaves, gingko is more and more widely used in afforestation. With its rich economic benefits, gingko is more and more popular, which makes it a precious landscaping and economic tree species. In recent years, with the acceleration of the process of urbanization in our country, there is a great demand for large-sized gingko (DBH 8 cm or more). However, due to the special biological characteristics of Ginkgo biloba, resulting in many