树木引种,特别是经济树木的引种,在发展林业生产和科学研究工作中,都占有很重要地位,在树种资源贫乏的国家和地区,已经引起极大的重视。通过不同方式的引种活动,不仅能够改变一个国家和地区的树种布局、丰富本地种质资源、提高林业生产水平、满足社会特殊需要;而且与育种工作相比,花费时间短、收效快、节省开支。所以 The introduction of trees, especially the introduction of economic trees, plays an important role in the development of forestry production and scientific research, and has drawn great attention in countries and regions where tree resources are scarce. Through different kinds of introductory activities, it can not only change the tree species distribution in a country or region, enrich local germplasm resources, raise the level of forestry production and meet the special needs of the society, but also save time and money as compared with breeding work . and so