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陕北丘陵沟壑区总土地面积6.4万平方公里,占全省黄土高原总面积的50%。这一广大地区梁峁起伏、地形破碎、植被稀疏、耕垦指数高,是水土流失最严重的地区,也是黄河泥沙的主要产地。该区一般侵蚀模数都在1万吨/平方公里左右,白于山河源和无定河、清涧河流域达2万吨/平方公里,皇甫川、佳芦河一带高达3万吨/平方公里以上。全区年产粗沙量3.2亿吨,为黄河粗沙总量的43.7%。
Hilly and gully areas in northern Shaanxi total land area of 64,000 square kilometers, accounting for the province’s total area of the Loess Plateau 50%. The vast area of Liangbi ups and downs, terrain broken, sparse vegetation, cultivation index is high, is the most serious soil erosion areas, but also the main producing areas of the Yellow River sediment. The general erosion modulus in this area is about 10,000 tons per square kilometer. Baiyunshan Heyuan and Wudinghe, Qingjianhe basin reach 20,000 tons per square kilometer. Huangfuchuan and Jialuhe areas have an area of 30,000 tons per square kilometer. Km above. The annual gross output of 320 million tons of coarse sand, 43.7% of the total volume of the Yellow River.