毛白杨是我省优良用材树种,分布广泛,栽培历史悠久。它在长期系统发育过程中,受到自然环境和人工栽培的影响,产生了很大变异。我们在毛白杨育苗、造林和良种选育的实践中,从1971年开始,以我所渭河试验站1963年营造的速生丰产试验林为基点,进行观察研究,并在毛白杨分布较多的户县、周至、武功、宝鸡等县进行普遍调查。通过调查研究和定位观察,选出一个速生的毛白杨优良类型,拟名截叶毛白杨。截叶毛白杨数量较少,但在调查地区的4 Populus tomentosa is a good timber species in our province, widely distributed, cultivation has a long history. It is in the long-term phylogenetic process, under the influence of the natural environment and artificial cultivation, had a great variation. In the practice of raising poplar, afforestation and breeding of poplar, starting from 1971, based on the fast-growing and high-yield experimental forest built by Weihe Experimental Station in 1963, we observed and researched, and in the households with more poplar County, Zhou Zhi, martial arts, Baoji and other counties to conduct a general survey. Through the investigation and positioning observation, select a good type of fast-growing Populus tomentosa, named fake leaf cut poplar. The number of cut leaf poplar is less, but in the survey area 4