山东平原绿化尤其在农田林网中,绝大多数是欧美类杨树和小美类杂种。这些杨树树冠大、寿命短、材质差、胁地重,不是进农田的适宜树种。毛白杨虽系优良乡土树种,但树冠宽大遮荫重,生长较慢;近年来选出的抱头毛白杨属窄冠型,但生长太慢。本课题研究的目的,是通过杂交育种选出速生、材质优良、树冠窄、深根型适于进农田的白杨派新品种。 Shandong plain green especially in farmland forest network, the vast majority of European and American poplar and small American hybrids. These poplar crown, short life expectancy, poor material, threatening, not suitable for farming fields. Although Populus tomentosa is a good native tree species, the canopy is broad-shade and slow-growing. The poplar is a narrow-crown type selected in recent years, but its growth is too slow. The purpose of this research is to select new Populus tomentosa varieties which are suitable for growing in farmland through selecting cross-breeding, high quality materials, narrow canopy and deep roots.