地理学报 ›› 1965, Vol. 31 ›› Issue (2): 142-156.doi: 10.11821/xb196502005

• 论文 • 上一篇    下一篇

宁夏河东沙区沙丘沙的来源

徐俊名   

  1. 中国科学院地理研究所西南地理研究室
  • 出版日期:1965-04-15 发布日期:1965-04-15
  • 基金资助:

THE SOURCES OF THE DUNE SANDS IN THE REGION EAST OF THE YELLOW RIVER IN NINGHSIA

HSU CHUN-MTN   

  1. Institute of Geography, Academia Sinica
  • Online:1965-04-15 Published:1965-04-15

摘要: 宁夏河东沙区包括宁夏黄河东面有沙丘分布的陶乐、灵武、金积、盐池和同心五县。沙丘的移动给本区牧业、农业、甚至交通和工矿带来不同程度的危害。防风治沙的工作早巳开展,但是与防风治沙关系极为密切的本区沙源问题,迄今还未解决。

关键词:

Abstract: The total area occupied by sand dunes is about 1050 square kilometers or 5.8%of the investigated. 77.5%of the sand dunes are concentrated in Taolo and Lingwu, ex-tending as continuous belts. While in the other districts, they are only scattered. The extensive Quaternary deposits of varied origin, which are rich in sand, are the primary sources of the sand grains of the dunes. In other words, the sand dunes are formed in situ. This is revealed by the close relationship between the granulometric and morphoscopic characters of the dune sands and that of the nearby quaternary deposits. There axe four basic ways in which the dunes are formed in this region: Firstly, the wind works on the sand grains from the product of the disintegration of bed rocks to form dunes; Secondly, the sand grains, which were deposited abundantly in the dry valley in the wet season are picked up by the wind to form dunes in the dry season; Thirdly, the wind picko up the sand from the recent and ancient alluvial deposits of the Yellow River to form dunes; Fourthly, owing to the improper extension of the cultivated land, the improper grazing or collection of the firewood and medicinal plants, the semi-fixed and fixed sands are turn into drifting sand by the wind.