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建国初期,有林地51万亩,覆盖率仅为4.4%,到1978年林地增加到80万亩,平均每年增加1万亩.党的十一届三中全会后,尤其是改革后的近10年,经过“三北”防护林体系一期工程和二期工程前四年的建设,使林地面积达到404万亩,森林覆盖率达到16.9%.自1989年确立为生态经济型防护林示范区以来,他们遵照林业部三北局“突出重点,搞好样板,提高效益,示范推广”的精神,在黄土残垣丘陵区综合治理和全面开发上作了大胆地尝试与探索,取得了显著的成效.一、应用先进技术,大搞科技兴林.听水河流域的六县生态经济型林业建设,注重科学技术,认真总结先进经验.在培育苗木、整地栽植、抚育管理上都能推广和应用适合当地生产的新技术.整地造林时,因地制宜地采取了条带、水平阶、隔坡水平沟等方式,达到蓄水保响,增强苗木抗旱能力,夏、秋季整地,翌年春季栽植,
In the early days of the founding of the PRC, there were 51 million mu of forest land with a coverage rate of only 4.4%. By 1978, the area of forest land increased to 800,000 mu, an average of 10,000 mu per year. After the Third Plenary Session of the 11th CPC Central Committee, especially after the reform, Year, after the construction of the first phase of the “Three North” shelterbelt system and the first four years of the second phase of construction, the forest area has reached 404 mu and the forest coverage rate has reached 16.9%. Since it was established as an eco-economic shelter demonstration area in 1989, In line with the spirit of “highlighting the key points, improving the efficiency, demonstrating and popularizing” of the Three North Bureau of the Ministry of Forestry, they have made bold attempts and exploration in the comprehensive management and comprehensive development of the loess hilly areas and achieved remarkable results. First, the application of advanced technology, vigorously promote forestry science and technology. Listen to the six counties in the river eco-economic forestry construction, focusing on science and technology, conscientiously sum up the advanced experience in cultivating seedlings, site preparation, tending management can promote and apply suitable Local production of new technologies. Land preparation afforestation, according to local conditions to take a strip, level, level slope ditch and other means to achieve water conservation, enhance seedling drought resistance, summer, autumn soil preparation, planting the following spring,