土壤风蚀量随风速的变化规律研究

Study on the changing laws of wind-blown mass affected by wind speed

使用野外风洞作为风蚀研究的试验手段,通过农田土壤、沙及生土的风洞试验研究发现,农田土壤的风蚀量随风速呈指数函数变化,沙及生土的风蚀量随风速呈幂函数变化。试验研究还表明,农田土壤的风蚀量与表土层(3cm)的含水量呈显著负相关,沙的风蚀量与含水量的相关性不显著。风蚀导致土壤中的细颗粒成分大量损失,这是土壤颗粒粗化的原因所在。

The field experiment was conducted on the cultivated soil, sand and immature soil by using field wind tunnel. The results show: that the relationship between wind erosion quantity and wind velocity is fitled well in exponential functions for the cultivated soil, and in power functions for the sand and immature soil. There is a negative correlation between the quantity of wind erosion and the topsoil (30 cm) water content for the cultivated soil, but there is no evident dependency relation between the quantity of wind erosion and water content for sand. A large amount of fine particles in the soil is lost during the wind erosion, which is the main causation of siol particle coarsening.