Nitraria tangutorum is a widely distributed shrub in the Jilantai Salt Lake at the southwest edge of Ulan Buh Desert. Due to their role in increasing soil fertility, nebkhas (coppice dunes) are regarded as important components of arid land ecosystems. Yet, despite their frequent occurrence, little information exists regarding their dust fall effect and influence range. We investigated the grain size distribution around N. tangutorum at a small scale (within 10 m) according to four wind directions and analyzed the spatial heterogeneity of particles. The amount of non-erodible particles (>0.85 mm) increased with distance from the shrub. The amount of erodible (<0.45 mm) and semi-erodible particles (0.45–0.85 mm) showed an opposite trend, indicating that the shrubs have a protective effect. The dominant particles around the shrubs were non-erodible due to long term accelerated wind erosion and subsequent removal of fine particles.

唐古特白刺（Nitraria tangutorum）是在乌兰布赫沙漠西南边缘的吉兰泰盐湖中广泛分布的灌木。由于其在提高土壤肥力中的作用，nebkhas（矮沙丘）被视为干旱土地生态系统的重要组成部分。然而，尽管它们频繁发生，但关于其降尘效果和影响范围的信息很少。我们调查了唐古特猪笼草周围的晶粒尺寸分布根据四个风向进行小规模（10 m以内）的观测，并分析了粒子的空间异质性。不可蚀颗粒（> 0.85 mm）的数量随与灌木的距离增加而增加。可蚀性（<0.45 mm）和半蚀性颗粒（0.45-0.85 mm）的数量呈现相反的趋势，表明灌木具有保护作用。由于长期加速的风蚀和随后的细小颗粒清除，灌木周围的主要颗粒是不可侵蚀的。