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秦岭地区是我省重要的水源涵养林带,也是我省主要的木材生产基地。多年来,特别是十年动乱时期,由于乱砍滥伐,毁林开荒,使森林资源急剧减少,植被破坏十分严重,森林环境发生了根本性变化,不少地方气候失调,木材产量下降。为了尽快恢复秦岭林区的本来面貌,增强秦岭林区涵养水源的效能,并提高木材生产率,急需解决的问题是积极选育适宜秦岭高寒地区生长的速生用材树种。根据多年的调查研究,冬瓜杨是适宜秦岭高寒山区生长的速生用材树种。在秦岭林区,群众所叫的冬瓜杨计有三种,一是小青杨 Populus pseudo-simonii Kitagawa(也称青杨树、冬瓜杨)。树冠广卵形。中龄树皮淡灰绿色,光滑;老龄树皮灰白色。树干下部有浅纵裂。叶菱状卵圆形或卵圆形,
Qinling area is an important source of water conservation in our province, is also the main timber production base in our province. Over the years, especially during the ten-year turmoil, deforestation and land reclamation have brought about a drastic reduction of forest resources and serious destruction of vegetation. As a result, fundamental changes have taken place in the forest environment. In many places, the climate is out of balance and the output of timber is declining. In order to restore the original appearance of Qinling forest area as soon as possible and enhance the efficiency of conserving water source in Qinling forest area and improve the timber productivity, the urgent problem to be solved is to actively select the fast-growing timber species suitable for growing in the alpine area of Qinling. According to years of research, winter melon Yang is suitable for growth in the Qinling Mountains alpine timber species. In the Qinling Mountains, there are three kinds of poplar pseudo-simonii Kitagawa called Populus pseudo-simonii Kitagawa. Crown wide oval. Middle-aged bark grayish green, smooth; gray bark aging. The lower part of the trunk has a shallow longitudinal split. Leaves rhombic-oval or oval,