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一、概况: 陇东西南部黄土高原沟壑区属于陕甘宁盆地的一部分,行政位置属平凉东部。地质基础为长期稳定的鄂尔多斯地台边沿,基岩上覆盖着深厚的第三纪保德期三趾马红土和第四纪黄土,深度约七十至一百米。本区原为森林草原,由于人类的长期经营活动,自然植被破坏,水土流失严重,塬面切割破碎,沟壑纵横,由泾河及其支流汭河、黑河、达溪河、红河分割成大小不等的黄土阶地和丘陵。
I. Overview: The Gully Region of the Loess Plateau in the southwestern part of Gansu belongs to the part of the Shaan-Gan-Ning Basin. The administrative location is east of Pingliang. Geological foundation for the long-term stability Erdos platform edge, the bedrock is covered with deep Tertiary Paeodian Triodon red earth and Quaternary loess, depth of about 70 to 100 meters. The area was originally a forest steppe. Due to long-term man-made activities and natural vegetation destruction, serious soil erosion, the plateau was cut and broken and the ravines were ravaged by the Jinghe River and its tributaries. The Heihe River, the Heihe River, the Daxi River and the Honghe River were divided into small and small And other loess terrace and hills.