中国沙漠 ›› 1992, Vol. 12 ›› Issue (4): 41-49.

• 论文 • 上一篇    下一篇


刘玉璋, 董光荣, 李长治   

  1. 中国科学院兰州沙漠研究所
  • 出版日期:1992-12-20 发布日期:1992-12-20

Study on Some Factors Influencing Soil Erosion by Wind Tunnel Experiment

Liu Yuzhang, Dong Guangrong, Li Changzi   

  1. Institute of Desert Research, Academia Sinica, Lanzhou
  • Online:1992-12-20 Published:1992-12-20

摘要: 利用风洞实验技术,对影响土壤风蚀的诸因素进行模拟实验,进而定量或半定量地确定各因素在风蚀过程中的作用与关系。土壤风蚀是由自然因素和人为因素相互作用的综合产物,人为因素作用是叠加于自然因素作用之上的加速过程,实验表明,由人为因素引起的风蚀量占总风蚀量的78.6%,而自然因素只占21.4%。

关键词: 土壤风蚀, 风洞实验

Abstract: Soil wind erosion can be influenced by wind regime,vegetative cover,soil moisture content,soil texture,cultivation,grazing,and collection of fuelwoods etc..By the wind tunnel experiment,the influences of these factors on wind erosion are quantitatively and semi-quantitatively studied Experimental results showed that the erosive intensity of sand-carrying wind is 4.36-72.9 times higher than that of the wind without sand at the same wind velocity.The high soil moisture content favours wind erosion control.The erosive intensity of semi-fixed sandy land is 12.9 and 2.84 times higher than that of the aboriginal grassland and the vegetated sandy land respectively.Under the same physical conditions,the irrational human activities,such as over-cultivation,over-grazing and undue collection of fuelwoods,can greatly accelerate the natural wind erosion.Wind erosion process is an intergrated phenomenon related with many natural factors and human ones,human factors play an important role in wind erosion,the wind erosion loss caused by human factors occpies 78.6% of the total value and that caused by natural factors occupies 21.4%.