毛乌素沙地常见灌木单株对土壤风蚀的影响

选取沙蒿、柠条、杨柴3种灌木单株为研究对象，对其周围风速及输沙量进行观测，应用空气动力学原理分析这3种植物单株对土壤风蚀的作用，结果表明：1）在春季植株尚未展叶的时期，相似横截面的3种单株，透风系数小的沙蒿植株比其他植物的防风阻沙作用显著，且防护距离最大；2）不合理的配置格局会导致灌丛之间形成的流场空间产生狭管效应，加重土壤的风蚀，今后的植被建设中，植株要进行合理的配置，才能使其产生更好的防护效果。

Effect of single shrub on wind erosion in Mu Us Sandland

Artemisia sphaerocephala、Caragana intermedia、Hedysarum fruticosum var.mongolicum are common plants in Mu Us Sandland,and are main species for preventing soil wind-erosion.This paper takes the single shrub of these species as research subjects,and the wind velocity and sediment delivery around them was measured,and their wind flow field based on aerodynamics principle was analyzed,It is concluded: 1) before the leaf-expansion period in spring,the protective effect of Artemisia sphaerocephala is superior and its protection distance is biggest one among three single shrub with similar cross section.2) The unreasonable disposition structure can cause the channeling effect in the current flow field between shrubs,and aggravate wind erosion.In order to improve the protective effect in the future,the plant disposition must be rational.