近日，经国家计委和国家林业局正式批复，“十五”期间，国家将在甘肃投资近12亿元，全面启动三北防护林体系四期建设工程。工程涵盖12个地（市、区）的70个县（市区），总土地面积39.1万hm2，占全省总土地面积的86.1%，造林总规模达80.8万hm2。通过三北四期防护林体系建设，要 Recently, the State Planning Commission and the State Forestry Administration formally approved that during the “Tenth Five-Year Plan” period, the state will invest nearly 1.2 billion yuan in Gansu Province to launch the fourth phase of the Three-North Shelterbelt Program in an all-round way. The project covers 70 counties (urban districts) in 12 prefectures (cities and districts) with a total land area of ​​391,000 hm2, accounting for 86.1% of the total land area of ​​the province and a total afforestation of 808,000 hm2. Through the Three North four shelterbelt system construction, to