College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, China.
Inner Mongolia Academy of Forestry, Hohhot, Inner Mongolia, China.
Sci Prog. 2021 Apr-Jun;104(2):368504211009368. doi: 10.1177/00368504211009368.
Sand transport is the main manifestation of sand damage in the arid and semiarid regions globally. It is a huge challenge to stabilize mobile sandy and change them into stable productive ecosystems. The establishment of simulated shrubs is one of the most effective measures to solve the above difficulties as a novel sand-barrier. To clarify simulated shrubs' role in the process of ecological restoration. It will be greatly helpful to incorporate the shelter device proposed in the present work into landscape models for aeolian soil transport, to optimize the parameters associated with the sand-barrier characteristics for aeolian soil stabilization at the field scale. A series of wind tunnel experiments were conducted to analyze the variations of soil grain-size of simulated shrubs with different spatial configurations, row spaces, and net wind speeds. Further, the soil grain-size parameters were calculated by the classic method proposed by Folk and Ward to clarify the change of soil particles resulted from the blocking effects. The average grain-size content of simulated shrubs with different spatial configurations, row spaces, and net wind speeds was dominated by medium sand and fine sand, and the total percentage was more than 90%. Moreover, the sand deposition of simulated shrubs with different spatial configurations increased with the improvement of wind speeds. The average sand deposition of spindle-shaped simulated shrubs in 17.5 × 17.5 cm and broom-shaped simulated shrubs in 17.5 × 26.25 cm under different net wind speeds was the least. The effects of row spaces on average grain-size parameters increased with the improvement of net wind speeds. By calculating the correct characteristics of specific shelter devices proposed in the present work, all of these findings suggest that the application of simulated shrubs will be an important component to further extend ecological engineering projects in arid and semiarid regions.
风沙输运是全球干旱半干旱地区风沙危害的主要表现形式。将活动风沙固定并转化为稳定的生产力生态系统是一项巨大的挑战。模拟灌木林的建立是解决上述困难的最有效措施之一，它是一种新型的风沙障。为了阐明模拟灌木林在生态恢复过程中的作用。将本工作提出的遮蔽装置纳入风沙输运的景观模型中，对于优化与风沙障特征相关的参数以实现田间尺度的风沙固定，将有很大的帮助。进行了一系列风洞实验，以分析具有不同空间配置、行列间距和净风速的模拟灌木林的土壤粒径变化。进一步，采用 Folk 和 Ward 提出的经典方法计算土壤粒径参数，以阐明由于阻挡作用导致的土壤颗粒变化。具有不同空间配置、行列间距和净风速的模拟灌木林的平均粒径含量主要由中砂和细砂组成，总百分比超过 90%。此外，不同空间配置的模拟灌木林的风沙沉积随风速的提高而增加。在不同净风速下，17.5×17.5cm 纺锤形模拟灌木林和 17.5×26.25cm 扫帚形模拟灌木林的平均风沙沉积量最小。行列间距对平均粒径参数的影响随净风速的提高而增大。通过计算本工作提出的特定遮蔽装置的正确特征，可以得出所有这些发现表明，模拟灌木林的应用将是进一步扩展干旱和半干旱地区生态工程项目的重要组成部分。
