上海中心城区垂乳银杏资源调查与分析

垂乳银杏是银杏家族的一种特异种质,对研究这种我国独有的孑遗裸子植物存续、繁衍和长寿命机理有着重要意义。通过对上海市中心城区(中环线内)的69株古银杏及98株银杏大树的全面调查,共发现了39株垂乳银杏,其萌生比例远高于国内对野外自然生长的垂乳银杏资源的调查结果。这些垂乳银杏的不同生长形态揭示了都市非自然生态环境与银杏垂乳的低龄化及高诱发率有着直接的关系,为更有针对性地开展古树名木的科学保护和进一步开展银杏特异种质的科学研究提供依据。

Investigation and Analysis on Chichi Ginkgo Resources in the Central Urban Area of Shanghai

Chichi ginkgo is a distinctive germplasm in ginkgo family. It has important scientific research values to the reproduction, growth, and long-lived mechanism of this unique relic gymnosperm in China. Through a full investigation on 69 ancient Ginkgo biloba and 98 adult G. biloba within the central urban area of Shanghai, 39 chichi ginkgo trees are found among them for the first time. Their occurrence rate is much higher than that of the chichi ginkgo grown in the natural environment, which were found in the previous investigation. The investigation data revealed that the unnatural ecological environment of the urban area has a direct effect on higher occurrence rate and incidences in younger age of chichi ginkgo. It also provides a basis for the scientific studies on the protection of ancient and famous trees and for the further research on the specific germplasm of G. biloba.