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％。
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 f uelwoods, can greatly accelerate the natural wind erosion. Wind erosion process is an intergrat-ed 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%.
出处
《中国沙漠》
CSCD
北大核心
1992年第4期41-49,共9页
Journal of Desert Research
