引种可以丰富树种资源,调整本地区现有树种布局,提高林业生产水平,增加经济效益。廿多年来我师垦区进行了大量的引种工作。先后引入15科,18属,约128种。通过较长时间的栽培,多数已经安家落户,有的己成为我垦区造林绿化的主要树种。据不完全统计,推广面积达4000公顷左右,占全师人工林面积的71.8％。现将引种工作简结如下。 Introduction can enrich species resources, adjust the layout of the existing tree species in the region, improve the level of forestry production and increase economic benefits. Twenty years I division reclamation area conducted a large number of introduction. Has introduced 15 families, 18 genera and about 128 species. Through a long period of cultivation, most have settled in settlements, and some of them have become the major tree species in afforestation in our reclamation area. According to incomplete statistics, the promotion area is about 4,000 hectares, accounting for 71.8% of the total plantation forest area. The introduction of the work is summarized as follows.