Bad weather, such as the heavy summer rains, after drouth, which saturate ploughed soil, reduce soil shear strength, facilitate masse soil movement, and instigate gullying.

• 恶劣的气候条件，比如久旱之后的夏季强降雨，使土壤耕地饱和，降低土壤切变力，容易使土壤移动，形成冲沟。