位于坝上高原的张北县,曾经是个生态条件十分恶劣的地方,“一年一场风,年初到年终,春天刮出土豆籽,秋天刮到犁底层”是当年恶劣环境的真实描写。全县仅有960亩桦树天然次生林残留在坝头一线的深山区中。近四十年来,张北人民在当地党委、政府的领导下,持续地开展了旨在改变生态环境、改善生存生活条件的造林绿化活动。全县林果面积已达到109万亩,其中农田防护林32万亩,防风固沙林31万亩,沿坝水源涵养林45万亩,经济林1万 Zhangbei County, located on the dam plateau, once was a very poor ecological condition. “There was a wind in a year. From the beginning of the year to the end of the year, the potato seeds were scraped out in the spring and scraped to the bottom of the plow in the autumn.” . The county only 960 acres of birch natural secondary forest residue in the first line of the mountainous area. In the recent four decades, under the leadership of the local party committees and governments, the people of Zhangbei continued to carry out greening and afforestation activities aimed at changing the ecological environment and improving living and living conditions. The county has reached 1090000 acres of fruit area, of which 320000 acres of farmland shelterbelts, windbreak sand forest 310000 mus, 450000 acres of water conservation forest along the dam, economic forest 10000