介绍: 大河小流域幅员面积29.79km2,水土流失总面积14.97km2,占幅员面积的50.3 %,其中:轻度流失面积880.67hm2,占流失总面积的58.8%;中度流失面积462.34hm2,占30.9%;强度流失面积154.01hm2,占10.3%。年土壤侵蚀总量5.58万t,平均侵蚀模数1875.0t/km2.a。