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毛白杨为雌雄异株树种。在我场营造的毛白杨丰产林中,通过观察、调查,发现在相同的立地条件下,同样管理措施的同龄林中,雌雄株生长量具有很大的差异。根据我们对同三村营林区和讲武城营林区毛白杨丰产林中雌雄株生长量调查证明:雌株比雄株生长量(单株材积)可大1—2倍。所以,加强对毛白杨雌雄株生长规律的调查、研究,选择优良类型造林,在林业生产实践中具有重要意义。一、毛白杨雌雄株物候期、形态特征差异
Populus tomentosa is a dioecious tree species. In the field of poplar cultivation in my field, through observation and investigation, found that in the same site conditions, the same management practices in the same age forest, male and female plant growth has a great difference. According to our survey of the growth of male and female plants in the forest of Tongsan Village and in the forest area of Wuchengying, the growth of female and male plants is proved to be 1-2 times larger than the male plant growth. Therefore, to strengthen the male and female Populus growth rules of the investigation, research, selection of good type afforestation, in the practice of forestry production is of great significance. First, male and female Populus phenological period phenotypic differences