我县位于燕山南麓,长城脚下。原有荒山宜林地35万余亩,解放后,全县人民响应毛主席“绿化祖国”的伟大号召,自力更生,艰苦奋斗,积极开展植树造林,大部分荒山已实现了绿化,目前仅剩下8万余亩石多土薄、干旱缺水的大阳坡,造林比较困难。1972年春,我县在省林研所的协助下,学习了外地经验,在长城沿线的冷口大队试育了800个营养钵苗,春、秋两季进行了栽植,成活率在80％以上。1973年春在全县推广, My county is located in the southern foot of Yanshan, at the foot of the Great Wall. After the liberation, the people of this county responded to the great call of Chairman Mao’s “greening the motherland,” relying on their own efforts and hard work to actively carry out tree planting and afforestation. Most of the barren hills have been afforested and only eight More than a thousand acres of stone more soil thin, dry and waterless sunny slope, afforestation more difficult. In the spring of 1972, my county, with the help of the provincial forestry research institute, learned the experience in other fields. In the cold brigade along the Great Wall, 800 nutrition seedlings were planted and planted in spring and autumn. The survival rate was over 80% . The spring of 1973 to promote the county,