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最具特色的黄土高原,在中国地势的第二级阶梯上。黄土高原北起长城,南达秦岭,西抵祁连山,东至太行山,横跨陕西、山西等六个省区,总面积达58万平方公里,是世界上黄土分布最广阔、最深厚、也最典型的黄土地貌区。黄土高原水土流失严重。据统计,该区侵蚀模数大于1.5万吨/平方公里的面积达3.67万平方公里,占全国同类侵蚀强度面积的89%。局部侵蚀模数达到3万-5万吨/平方公里。多沙粗沙区面积达7.86万平方公里,产沙11.82亿吨。
The most unique loess plateau, the second level ladder in China’s terrain. Loess Plateau north of the Great Wall, South Qinling, West Qilian Mountains, east Taihang Mountains, across Shaanxi, Shanxi and other six provinces and autonomous regions, with a total area of 580,000 square kilometers, is the world’s loess is the most extensive distribution, the deepest and most Typical loess landform area. Soil and water loss in the Loess Plateau is serious. According to statistics, the area with an erosion modulus of more than 15,000 tons / square kilometer has reached 36,700 square kilometers, accounting for 89% of the similar erosion intensity area in China. Local erosion modulus reached 30000-500 tons / square kilometers. Sandy sand area of 78,600 square kilometers, 11.82 tons of sediment production.