【摘要】 同已有的调查相反 ,本文涉及的调查区域较大 ,含 1线 3点 15个自然村和 3个县的地域。着重研究银杏的区域地理分布特点。但其调查研究的方法和内容是相同的。包括快速踏查、目测、实测、记录、绘图及摄影等。对一些“多代同株”的银杏大树、则快中有慢、粗中有细。经 6次进出终于掌握了较丰富的第一手资料 ,取得三大系列数据 :“32 0国道贵阳昌明至景阳段及其邻近地区银杏调查总表”、“32 0国道调研地区的银杏种群物候型成分表”及“32 0国道研究区村落及银杏分布示意图”等。调查研究结果表明 :调查地区内至今还存在着一个树龄极大已处于濒死木阶段的古银杏群体。该群体至少出现于 2 0 0 0 - 30 0 0年以前的西州 (原始农业初期 )至三国时代 ,远远早于已知的银杏始种于宋的历史。因此 ,该古银杏群体应该是野生的。进一步分析表明 :其他小于该古树群的大量个体 ,应大部为该古银杏群的直接后裔。凭借自然繁殖的能力和人民群众的习俗爱护 ,野生或半野生地生长 ,发育和延袭至今。根据已发表和即将发表的资料得知 :32 0国道贵州昌明至景阳地区的古银杏群 ,应属贵州野银杏分布中心南缘古银杏群的一个残存部分。该残存部分以近村落、链珠状分布式集中分布于山谷盆地边缘 ,或呈斑点状或独株分布。其诸多特征表?更多还原

【Abstract】 WT5”BZ]This investigation involved a much larger area than previous reasearch, including 3 counties and 16 villages along 320 national highway in Guizhou province. The focus was on the regional distribution characteristics of Ginkgo biloba. The firsthand materials contained a general list of the standing ginkgo trees from Changming to Jingyang along 320 national highway in Guizhou province, a list of climate types of ginkgo population from Changming to Jingyang, and an illustration of villages and associated ginkgo distribution. Investigation shows that there are dying ancient ginkgo populations in these areas. They are at least 2 000-3 000 years old from the Xizhou dynasty (the begining of agriculture time in China), which is much earlier than the first recorded cultivation of ginkgo in the Song dynasty. So it is likely that the ginkgo populations are wild. The young trees and seedlings in this area should be the direct offspring of this ancient population from natural propagation. From our data, this ancient ginkgo population belongs to the southern part of Guizhou wild ginkgo distribution center. The tree is distributed as cluster in the edge of the valley, near the local villages or sporadic individually. We also report here “discovery of a gink go tree with branches with different sex status in Ong town” and “male Ginkgo population in Ong town”. Since ginkgo is normally dioecious, the discovery of a tree with both male and female flowers is quiet unusual. [WT5”HZ]更多还原