当前,世界木材清耗量迅速增加,现有森林资源难以满足日益增长的木材需要,因此,扩大造林,尤其扩大速生树种造林,以增加森林资源,是林业生产主要趋势。速生树种造林开展的较早的国家中,意大利在速生杨树树种选种育种方面做了较大量的工作,突出的成果是选育一批生 At present, the world’s wood consumption is rapidly increasing. Existing forest resources can not meet the growing demand for timber. Therefore, expanding afforestation, especially expanding afforestation of fast-growing tree species to increase forest resources, is a major trend in forestry production. Among the earlier countries where the planting of fast-growing trees started, a large amount of work has been done in the selection and breeding of poplar tree species in Italy. The outstanding result is that a batch of students