Variation in Grain-size Characteristics of Stimulated Shrubs As a Novel Sand-barrier in a Wind Tunnel Experiment

Sand transport is the main manifestation of sand damage in the arid and semiarid desert regions globally. It is still a challenge for ecologists to stabilize mobile sandy and to change them into stable productive ecosystems. The establishment of stimulated shrubs is one of the most effective measures as a novel sand-barrier. Meanwhile, it has a beautiful visual effect in deserts. To better understand its role in the process of ecological restoration, we conducted a wind tunnel experiment to analyze the overall characteristics of soil grain-size variation of different spatial configurations with simulated shrubs in row spaces under different net wind speeds. The results present that the average grain-size content was dominated by medium sand and fine sand, and the total percentage was more than 90%. The average grain-size content for other soil grain-size was almost the same and the proportion was less than 10%. Moreover, the sand deposition of simulated shrubs with different spatial configurations increased with the improvement of wind speed. And the average sand deposition of spindle-shaped simulated shrubs in 17.5×17.5cm and broom-shaped simulated shrubs in 17.5×26.25cm under different wind speeds was the least. There was less variation of the soil grain-size parameters among different spatial configurations of stimulated shrubs, row spaces, and net wind speeds. The effects of row spaces on average grain-size parameters would be improved with the increase of wind speed. By calculating the “correct” characteristics of any specific shelter device, all of these findings suggest that the application of the simulated shrubs will be an important component to further extend ecological engineering projects in arid and semiarid desert regions.