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毛白杨,在我县栽培历史悠久,它生长快、寿命长、材质好、树干高大通直、树姿雄伟壮丽,是四旁植树和营造农田林网的重要树种。目前省内正大力研究提高毛白杨栽培技术,关于毛白杨的生长规律和适生立地条件,也必须深入探讨,1980年我们在汶河林场进行了观察试验,现将试验情况总结如下。一、观察材料及方法(一)物候期观察:观察的内容包括雄花显露、雄花脱落、芽膨胀、芽展开、开始出叶、完全出叶、新芽形成、叶初落、叶全落、芽封顶。(注)
Populus tomentosa, cultivation in our county has a long history, it grows fast, long life, good material, tall tree trunk straight, magnificent tree pose, is surrounded by trees and create an important species of farmland forest network. At present, the province is vigorously studying and improving the cultivation techniques of Populus tomentosa, Populus tomentosa growth rules and conditions for habitats must also be explored in depth in 1980, we conducted an observation test in Wenhe Forestry Center, the test is summarized as follows. First, the observation of materials and methods (A) observation of the phenophase: observations include the male flowers revealed that the male flowers off, bud expansion, bud expansion, began to leave, completely leaves, the formation of new buds, . (Note)