朝鲜银杏引种育苗试验

辽宁省是我国银杏分布的最北界。银杏不但是丹东的市树，也是该地区经济林发展的主要树种。丹东的银杏采种母树90％局限于市区内行道树，每年采种量仅为2000kg左右，满足不了当地育苗需要。由于种源匮乏，不得不从山东、江苏等地引进苗木。但由于引进苗木长势明显不如当地苗木，且冻害严重，造成引种失败。从1997年由纬度相近，地理环境、气候条件相似的朝鲜新义州引进银杏种子，进行育苗试验获得成功。文章对银杏的引种育苗及苗木生长情况进行了报道。经试验看出，朝鲜种源培育出的苗民当地苗木长势无明显差异，为引种朝鲜银杏种源提供了科学依据。

Experiments on introduction and seedling cultivation of Ginkgo biloba from North Korea

Liaoning province is the north boundary of Ginkgo biloba distributed in China. Ginkgo biloba is not only the city-tree of Dandong, but also the main tree of economic stands in this region. 90% of mother trees for seed collecting of Ginkgo biloba is restricted into shade trees in urban areas, quantity of collecting seed is only 2t per year that doesn't meet the need of seedling cultivation. For the provenance is scanty, seedlings have to be introduced from Shandong and Jiangsu. However, introduced seedlings don't grow as well as native seedlings, and frozen damage is serious, so that introduction is failure. In 1997, seed of Ginkgo biloba was introduced from Xinyi city in North Korea which altitude, geological environment and climatic conditions are similar to Dandong city for the first time, seedling cultivation experiments were got with success. In this paper, seedling cultivation and growing of introduced Ginkgo biloba are reported. The results show that the difference of growing between introduced seedlings from North Korea with native seedlings isn't significance, that provides scientific basis for introducing provenance of Ginkgo biloba.