我区黄土丘陵属栗钙土类型,土层深厚,水位较深,结构坚实,透水性差,肥力较低。粟钙土有季节性淋溶特点,形成钙积层。过去,黄土丘陵地区造林前常不整地,或一锹一镐地小块整地,或脱离实际进行机械整地,效果都很不理想,保存率很低,甚至形成一坡一坡的“小老树”。 Loess Hill in my area is a type of chestnut soil, deep soil, deep water, solid structure, poor water permeability, low fertility. Travertine soil seasonal leaching characteristics, the formation of calcium accumulation. In the past, the loess hilly area often reforestation, or spade a pick a small piece of soil preparation, or from the actual mechanical preparation, the effect is not ideal, the preservation rate is very low, and even the formation of a slope of a “small old tree ”.