河南省中牟县南部有高大砂丘,1950年开始封砂育草和人工造林,流砂基本固定。但尚有部分流砂未固定,树木稀少,寸草不生,丘高5—6丈以上,迎风面坡度30—4O度,背风面坡度50—60度,砂岗常因大风而前移。1951— In south of Zhongmu County, Henan Province, there are tall sand mounds. In 1950, sand-sealing and grass-planting and artificial afforestation started and sand was basically fixed. But there is still part of the quicksand is not fixed, sparsely populated, the grass is not born, Qiu Gao 5-6 feet above the windward slope of 30-4O degrees, the leeward slope of 50-60 degrees, sand Kong often due to the wind and move forward. 1951-