敖汉旗在“三北”防护林体系建设的最初几年,造林面积虽然大幅度增加,但成活率和保存率很不理想。近两年,他们认真总结经验教训,在科学造林上下功夫,取得了可喜成绩,造林79万亩,保存率达83.5％。一、造林前一定要整地。敖汉旗的大部宜林地是黄土丘陵,土质瘠薄,水土流失严 Aohanqi In the early years of the “Three Norths” shelterbelt system construction, although the area of ​​afforestation increased substantially, the survival rate and preservation rate were not satisfactory. In the past two years, they earnestly sum up experiences and lessons and made great efforts in afforestation of science. They achieved gratifying results with an afforestation of 79 million mu and a preservation rate of 83.5%. First, before afforestation must be prepared. Ao Han flag most of the forestland is loess hills, infertile soil, soil erosion and strict