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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,发现毛白杨的物候期不一致,生长速度也表现出较大的差异。于是从一九六六年开始,注意观察其形态变异,从一九七一年开始,以我所渭河试验站一九六三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
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 Populus tomentosa, we found that the phenophase of Populus tomentosa is inconsistent and the growth rate also shows a big difference. Since 1966, attention has been paid to the observation of its morphological variation. Starting from 1971, based on the fast-growing and high-yield experimental forest that I Weihe Experimental Station built in 1963, Poplar more distribution of Huxian, Zhou