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一、前言杨树,是“三北”地区造林的主要树种之一。在彰武县人工林面积1247km~2中,有各种杨树林1093km~2。以小叶杨、小青杨居多。近年来已开始引进各种杂交杨,截至目前为止造林面积200km~2。从多年的造林实践中观察,各种杨树在彰武县的各类立地条件下虽均能成活、生长,但由于品种的不同,则表现了明显的差异。小叶杨虽然较耐干旱、耐瘠薄,适应性广,
I. Preface Poplar is one of the main tree species for afforestation in the “Three Norths” region. In Zhangwu County plantation area of 1247km ~ 2, there are a variety of poplar 1093km ~ 2. To poplar, young green mostly. In recent years, various hybrid poplars have been introduced, so far the area of afforestation is 200km ~ 2. Observed from many years of afforestation practices, all kinds of poplar trees in Zhangwu County under the conditions of all kinds of sites can survive and grow, but because of the different species, showed significant differences. Although Populus tomentosa more resistant to drought, barren, wide adaptability,