黄土高原地处我国东部经济区向西部经济区扩展的一个中间地带 ,在西部大开发中处于开发的前沿。但长期以来 ,因受人为活动的干扰和其特殊的地质地貌和生物气候条件限制 ,生态系统处于极不稳定的状态。改善生态环境 ,治理水土流失 ,离不开林草植被。为了使该区的植被建设能在较? The Loess Plateau, located in the middle of the expansion of the economic zone in the eastern part of the country to the western economic zone, is at the forefront of development in the western development. However, for a long time, the ecosystem is in a very unstable state due to the interference of human activities and its special geomorphology and bioclimatic conditions. Improve the ecological environment, soil erosion control, can not do without forest and grass vegetation. In order to make the area of ​​vegetation construction in more?