敦煌-格尔木铁路穿越西北干旱荒漠区，地表裸露、沙源丰富、风沙活动强烈。通过野外风沙定位监测和地表沉积物粒度特征分析，揭示了铁路沿线灌丛路段风动力环境和地表沉积物特征。结果表明：研究区年均风速和起沙风频率分别为2.13 m·s^-1和3.91%，年输沙势19.89 VU，属低风能环境，年际变率小，季节变化明显，冬季输沙势最高。主导风向相对单一，以南风和西风为主，且随季节变化差异显著。灌丛地表细颗粒占绝对优势，<250 μm细颗粒含量超过85%，并以<63 μm粉沙为主；无植被覆盖路基边坡<250 μm细颗粒含量60%~80%，>500 μm粗颗粒含量高达22%。灌丛沉积物平均粒径43.85 μm、偏度0.29、峰度1.41、分选系数2.06，边坡处对应值分别为117.18 μm、0.16、1.00、2.09，两地沉积物分选较差，灌丛沉积物更细且粒径分布更集中，说明灌丛保护下地表物质较为稳定，细颗粒被较好地保存。

The Dunhuang-Germany Railway passes through the desert area in northwest China， with bare surfaces， abundant sand sources and strong windblown sand activities. This paper reveals the wind dynamic environment and surface sediment characteristics of the shrub sections along the railway through field wind fixed position monitoring and surface sediment grain size analysis. The results show that the annual average wind speed and the frequency of sand-driving in the study area are 2.13 m·s^-1 and 3.91%， and the annual sand transport potential is 19.89 VU， which is a low wind environment with little inter-annual variation and obvious seasonal variation， and the highest sand transport potential in winter. The dominant wind direction is relatively homogeneous， mainly south wind and west wind， and with significant seasonal variation. The sediment in the shrub desert is dominated by fine particles， with <250 μm fine particles exceeding 85% and dominated by <63 μm silt； The <250 μm fine particles content on the unvegetated roadbed slopes ranges from 60% to 80%， with >500 μm coarse particles content reaching up to 22%. The mean grain size of the shrub sediment was 43.85 μm， with a skewness of 0.29， kurtosis of 1.41 and sorting coefficient of 2.06， and the corresponding value at roadbed slope is 117.18 μm， 0.16， 1.00 and 2.09， respectively. The sediments on the two sampling points are poor sorting， and the sediments under shrub are finer with a more concentrated grain size distribution， indicating that the surface material is stable due to shrub protection and fine particles are well preserved.