一、试验区概况庆阳黄土高原沟壑区水土流失严重,沟壑占总面积的62.4％,流失面积达82.5％,侵蚀模数为7300吨/平方公里。每亩土地一年流失表土2—6吨,流失降水26立米。特别是残塬区,沟壑纵横。梁峁参错流失量更大。全区宜草面积一千多万亩,普遍植被稀疏,保持水土能力差。近 First, the experimental area Overview Qingyang loess plateau gully area of ​​serious soil erosion, gully accounts for 62.4% of the total area, drainage area of ​​82.5%, erosion modulus of 7300 tons / square kilometers. The loss of topsoil 2-6 tons per acre of land a year, loss of precipitation 26 meters. In particular, the remaining area, ravines aspect. Liang 峁 Senate mistakes larger. The whole area of ​​grass area of ​​more than 10 million mu, the general vegetation sparse, poor soil and water conservation. near