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1978年五月国家林业总局在西安召开的“三北”(西北、华北、东北)地区防护林建设规划座谈会上,针对风沙危害和黄河中游水土流失重点地区的实际情况,着重强调了营造灌木林的重要性,指出:“从群众生产生活需要,从恢复森林植被,增强防护效益需要都必须实行乔灌结合,长短结合。……在乔木生长困难的地方,先灌后乔,这是一条客观规律。我们要重视灌木林的营造,实行乔灌结合,统一安排,就是营造用材
In 1978 May State Forestry Administration held in Xi’an in the “Three Norths” (Northwest, North China, Northeast) area shelter forest construction planning seminar, in view of the risk of sandstorm and the actual situation of key areas of soil erosion in the middle reaches of the Yellow River, emphasizing the construction of shrubs , Pointed out: "From the mass production and living needs, from the restoration of forest vegetation, and enhance the protection of the benefits must be combined with the length of the combination of ... ... in the arbor growing difficulties in the first irrigation after Joe, which is an objective We should pay attention to the construction of shrubbery, implement the combination of arbor and shrub, and unify the arrangement, that is, to create timber