为探究黑河中游荒漠绿洲过渡带典型灌丛植物防风固沙效应，通过野外调查观测，定量分析了固沙植物梭梭（Haloxylonam modendron）、泡泡刺（Nitraria sphaerocarpa）、沙拐枣（Calligonum mongolicum）对风沙流流量及风沙流结构的影响规律，并应用空气动力学原理分析了影响机制。结果表明：固沙植物防风效果表现为梭梭>沙拐枣>泡泡刺，且在迎风面和背风面差异显著，梭梭与其他灌丛植物相比防风效果更加显著，风速降幅可达到62.9%，有效防护距离最大；梭梭、泡泡刺、沙拐枣的阻沙效率分别为60.7%、51.0%、46.3%，且各灌丛植物在相同风速下输沙率随高度呈阶梯式递减；灌丛植物输沙率与风速符合指数函数或多项式函数关系，风速超过7.0 m·s^-1时输沙率增加速度最为剧烈。梭梭的阻风效果优于泡泡刺和沙拐枣，但其近地表防风蚀效果一般，泡泡刺因为低矮密集的植株结构表现出较好的防风蚀性，但有效防护距离最小，且在高度较大时防风效果较差。

In order to explore the windbreak and sand-fixation effects of typical shrub plants in the desert-oasis transitional zone in the middle reaches of the Heihe River， through field investigation and observation experiments， the influence laws of sand-fixation plants Haloxylon ammodendron， Nitraria sphaerocarpa， and Calligonum mongolicum on the quantity and structure of wind-blown sand flow were quantitatively analyzed， and the influence mechanism was analyzed using the principles of aerodynamics. The results showed that the windbreak effect was Haloxylon ammodendron>Calligonum mongolicum>Nitraria sphaerocarpa， and there was a significant difference between the windward side and the leeward side. The windbreak effect of Haloxylon ammodendron was more significant than that of other shrub plants， with the maximum wind speed reduction ratio of 62.9% and the maximum effective protection distance. The sand blocking efficiency of Haloxylon ammodendron， Nitrariasphaerocarpa and Calligonum mongolicum were 60.7%， 51.0% and 46.3% respectively， and the sediment transport rate of each shrub plant decreased with height in a stepwise manner under the same wind speed. The relationship between sediment transport rate of shrub vegetation and wind speed conforms to exponential function or polynomial function. The sediment transport rate increases most rapidly when the wind speed exceeds 7.0 m·s^-1. Comprehensive analysis shows that the wind resistance effect of Haloxylon ammodendron is better than that of Nitraria sphaerocarpa and Calligonum mongolicum， but its near surface wind erosion prevention effect is average. Nitraria sphaerocarpa exhibits good wind erosion resistance due to its low and dense plant structure， but its effective protection distance is the smallest， and its wind erosion prevention effect is poor when the height is large. This result can provide a reference basis for the construction of sand-fixing vegetation in the desert oasis transitional zone in the middle reaches of the Heihe River.