黄土高原的水土流失,曾举世闻名,是国家重大生态环境问题之一。作为黄河中游一级支流的无定河,流域面积达3万平方公里,是全国水土保持的重点治理区。在过去,无定河流域气候条件恶劣,地质地形复杂,风蚀水蚀剧烈,水土流失严重,对无定河流域乃至黄河下游人民的生产生活构成了巨大的威胁。 Soil and water loss of the Loess Plateau, once famous all over the world, is one of the major ecological and environmental problems in the country. As a tributary of the middle reaches of the Yellow River Wuding River, the basin area of ​​30,000 square kilometers, is the focus of soil and water conservation areas. In the past, the Wudinghe basin had bad weather conditions, complicated geological topography, severe wind erosion and severe water and soil loss, posing a huge threat to people’s life and production in the Wudinghe River basin and even the lower reaches of the Yellow River.