我国东北、华北、西北建设防护林体系,是我国林业史无前例的伟大工程。是中华民族向大自然的宣战。这条缘色长城,可以和国家南水北调工程比美。从经济效果看,建成“三北”防护林体系后,将从根本上改变大半个中国农业低产和缺林少付的面貌,实现黄河流碧水,赤地变青山的美好愿望。所以人民日报发表文章称为造福于人民的伟大工程。从经济角度看,由于大规模造林土地利用结构改善,林产品日益增加,不仅改变自然生态系统,同时还将从根本上动摇单一的农业经济结构,出现一个农林牧相结合的多种经济结构。防护林体系将在这一地区,形成稳定的生产系统。因此,“三北”防护林的经济意义,远比其名称的 The construction of the shelterbelt system in Northeast China, North China and Northwest China is a great and unprecedented project of forestry in our country. It is the declaration of war of the Chinese nation to nature. The color of the Great Wall, and the South Water Diversion Project can be more than the United States. From the perspective of economic results, the completion of the “Three Norths” shelterbelt system will fundamentally change the face of more than half of China’s low-yield agriculture and lack of forests, and realize the beautiful aspirations of the Yellow River flowing clear waters and turning red mountains into green mountains. So the People’s Daily published an article called a great project for the benefit of the people. From an economic point of view, due to the improvement of land use structure for large-scale reforestation, increasing forest products will not only change the natural ecosystem, but will fundamentally shake the single agricultural economic structure and emerge a variety of economic structures combining agriculture, forestry, animal husbandry and animal husbandry. Shelterbelt system will be in this area, forming a stable production system. Therefore, the economic significance of the “Three Norths” shelter forest is far beyond its name