Abstract:
Objective Soil starting wind speed is a key component in the development of soil wind erosion, and particle size is one of the most important factors affecting the soil starting wind speed, knowledge of the characteristics of the variation of starting wind speed of soil with different particle sizes and its influencing factors is essential for the control of soil wind erosion.
Method In this study, taking the black soil of the arable layer in Northeast China as the research object, the method of wind tunnel simulation was used to explore the characteristic features of the change of soil starting wind speed based on the division of different particle size groups and to analyze the main influencing factors of the soil starting wind speed in combination with its physicochemical properties.
Result The results showed that the particle size was the most critical factor affecting the starting wind speed, and the relationship between the starting wind speed and the particle size was non-linear. The relationship was shown as an increase in particle size and a decrease in starting wind speed between the three particle size groups of <0.063 mm, 0.063 ~ 0.1 mm, and 0.1 ~ 0.25 mm, and an opposite trend between the four particle size groups of 0.1 ~ 0.25 mm, 0.25 ~ 0.5 mm, 0.5 ~ 1 mm and 1 ~ 2mm. It was found that four factors (such as d, c, SBD and CEC) constituted the main set of factors influencing soil starting wind speed.
Conclusion By increasing the proportion of coarse particulate matter on the surface of arable land and improving the cohesion between soil particles, the movement of surface soil particles can be effectively controlled, thus providing better resistance to soil wind erosion. The above research is expected to provide some scientific basis for controlling the starting wind speed of arable soil, preventing and controlling soil wind erosion in the black soil area, as well as composite erosion that includes the wind erosion process.
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