华家岭是耸立在甘肃中部干旱地区的一座孤岛式高山。高寒而阴湿,自然条件相当差。西兰公路顺山梁蛇行而过。1970年以来采用片、带、网相结合的形式,沿公路两侧营造防护林带62,000多亩。十年来,林带虽然发挥了一些效益,但由于受自然条件、营林技术等多方面原因的影响,有一部分林木生长停滞,树体老化,缺乏生机,形成“小老树”。通过调查分析,以林木生物学特性和所处生态环境应该统一的原则找出影响林木生长的主导因子。针对存在问题,对林带经营方面提出抚育改造提高等几项措施。以促进林木生长。 Huajialing is an island-style mountain towering in arid areas of central Gansu. Alpine and damp, very poor natural conditions. Zeeland Highway along the mountain snake by. Since 1970, a combination of film, tape and net has been used to create 62,000 mu of shelterbelts along both sides of the road. Although the forest belt has exerted some benefits over the past decade, due to the natural conditions and the technology of silviculture, some of the forest trees have stagnated, and the trees have become old and lacks vitality, forming a “small old tree.” Through investigation and analysis, the dominant factors that affect the growth of trees are identified based on the principle that the characteristics of forest biology and the ecological environment should be unified. In response to the existing problems, several measures have been proposed to improve the tending and improvement of forest management. To promote forest growth.