陕北农民因受地力瘠薄,劳、畜力,肥料供应不足的限制,一般耕作粗放,垦种陡坡,放荒轮种,造成严重的水土流失,生产力不断低降。针对上述情况,延安站自1950年起开始在几个主要山头进行全面的水上保持规划,并试 Due to the limited land supply, labor, livestock and fertilizer supply, peasants in northern Shaanxi are generally cultivated extensively, steep slopes are cultivated, and abandoned farmland is rotated and rotated, causing serious soil erosion and loss of productivity. In response to the above situation, Yan’an Station began to conduct a comprehensive water conservation plan on several major hills since 1950