山西省地处黄土高原,境内40%以上为黄土丘陵地带,面积7900多万亩。近年来,由于“三北”防护林工程、退耕还林工程、天保工程和治沙工程的开展,林草覆盖率已大有增加。但从整体上看,这一地区的生态环境还很脆弱,水土流失还没有从根本上得到遏制,农业发展仍然受到生态环境的制约 Shanxi Province is located in the Loess Plateau, more than 40% of the territory of the Loess Plateau, an area of ​​more than 7900 mu. In recent years, due to the “Three Norths” shelterbelt project, the project of returning farmland to forestry, the project of natural forest protection and the project of sand control and desertification, the coverage rate of forest and grass has greatly increased. However, on the whole, the ecological environment in this area is still very fragile, soil erosion has not been fundamentally deterred, and agricultural development is still constrained by the ecological environment