坝上地区的风沙土,群众又叫犯风地或起风地,约占坝上总耕地面积的10%,其中沽源高达29%。由于风蚀危害,土层薄、砂砾多、肥力极低。播种后种子及幼苗常被风吹走或吹死,以致严重缺苗断咙,甚至毁种回放。因此,产量很低,亩产量仅四十至六十斤,严重地影响着当地农业生产。作者曾于1960年参加了张北高原的综合考察,对坝 Windy soil in the dam area, the masses also known as windy or windy land, accounting for about 10% of the total area of ​​arable land on the dam, which Guyuan up to 29%. As a result of wind erosion, thin soil, grit more fertility is very low. After sowing seeds and seedlings are often blown away or blown to death, resulting in severe shortage of seedlings cut throat, or even replanted. Therefore, the output is very low, only 40 to 60 tons of mu yield, seriously affecting the local agricultural production. The author participated in a comprehensive study of the Zhangbei Plateau in 1960, dam