地球上干旱和半干旱沙丘面积的总数估计占陆地面积的1/7左右。尽管巨大的开垦计划已经完成或正在进行着,但沙漠面积仍然不断地在增加。多年来人们一直在探索用一种保护层来覆盖沙丘,但这常常是困难的,因为甚至是中级风也能从沙丘脊部把沙粒吹走。沙丘如能固定,在雨季大多能够贮存降雨的沙丘上可以造林或者至少可以栽植灌木。长期以来,科学家们就了解到,在沙丘上喷一层石油 The total area of ​​arid and semi-arid dunes on Earth is estimated at about one-seventh of the land area. Despite the huge reclamation project completed or in progress, the area of ​​the desert continues to increase. Over the years people have been exploring to cover the sand dunes with a protective layer, but this is often difficult because even moderate winds can blow sand away from the ridges of the sand dunes. Dunes can be planted, or at least they can be planted with shrubs, on dunes that are mostly raining during the rainy season if they are stable. For a long time, scientists learned that spraying a layer of oil on the sand dunes