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三北防护林体系建设工程从1978年起,工程建设期限73年,规划造林5.34亿亩,三北地区的森林覆盖率将由5.05%提高到14.95%,沙漠化土地得到有效治理,水土流失得到基本控制。三北防护林建设工程横跨我国东北、华北、西北13个省(自治区、直辖市)的551个县(旗、市、区),占国土面积的42.4%。
Since 1978, the Three-North Shelterbelt Program has been in operation for 73 years with a planned afforestation of 534 million mu. The forest cover in the Three-North Region will increase from 5.05% to 14.95%. Desertification will be effectively managed and soil and water loss will be basically controlled. The Three-North Shelterbelt construction project covers 551 counties (banners, cities and districts) in 13 provinces (autonomous regions and municipalities directly under the Central Government) in northeast China, north China and northwestern regions, accounting for 42.4% of the total land area.