近些年米,为了丰富当地树种资源,提高经济价值,引种已成为人们改变生产面貌增加收入的重要手段,也是林业生产中一项重要的内容。所谓引种,即是将当地没有的经济价值高的树种由外地(或野生)引来在当地栽培,它包括木材、经济、药用、化学等诸方面的树种。在这个过程中,必然会出现两种情况:一种是原产地与引种的生长环境条件基本吻合,树木并不需要改变它的遗传特性,即能适应新的环境条件,并顺利生长和发育;另一种是原产地与引种地的自然条件有显著差异,或由于引进树木对风土 In recent years, rice has become an important means for people to change their production outlook and increase their income in order to enrich local tree resources and increase economic value. It is also an important content in forestry production. The so-called introduction, that is, there is no local high economic value of species introduced from the field (or wild) locally cultivated, which includes timber, economic, medicinal, chemical and other aspects of the species. In this process, there are bound to be two situations: one is the origin and introduction of the growing environment is basically consistent with the tree does not need to change its genetic characteristics, that can adapt to the new environmental conditions and smooth growth and development; The other is the natural conditions of origin and the introduction of significant differences, or due to the introduction of trees on the terroir