前言木材是工业建设和国防建设重要的原材料之一,随着祖国社会主义建设的高速度发展,国家对木材的需要量愈来愈大。因此,除充分利用现有森林资源以外,还必须大力发展速生树种,以满足木材供应日益增长的需要。若干年来,我省已从国外引入许多速生树种,但直到目前为止,引种比较成功而且已经大量发展的主要是银桦(Grevillea ro Foreword Timber is one of the important raw materials for industrial construction and national defense construction. With the rapid development of socialist construction in the motherland, the country’s demand for timber is getting larger and larger. Therefore, in addition to making full use of existing forest resources, fast-growing tree species must be vigorously developed to meet the growing demand for timber supply. In recent years, our province has introduced many fast-growing tree species from abroad, but up to now, the introduction of more successful and has been a large number of development is mainly Silver Birch (Grevillea ro