为揭示雅鲁藏布江山南宽谷段爬坡沙丘的形成过程、物源及沉积学意义，对山南宽谷段朗赛岭爬坡沙丘进行断面采样，分析爬坡沙丘不同地貌部位沉积物的粒度和地球化学元素特征。结果表明：爬坡沙丘表层沉积物以细沙和中沙为主，河漫滩和阶地表现出明显的风水交互特点，迎风坡和背风坡则表现为明显的风成特点；不同地貌部位沉积物粒度特征不同，从河漫滩到迎风坡坡顶，沉积物粒度整体变细，分选逐渐变好，从迎风坡顶到背风坡，分选变差。沉积物的地球化学元素以Si、Al、Fe、Na为主，在不同地貌部位分布差异较小，表明其具有相似的沉积环境，和上陆壳（UCC）相比，除Si以外其余常量元素均有亏损。微量元素集中分布于河漫滩沉积物中，部分存在于稳定矿物中的微量元素可分布于坡麓地带。A-CN-K图解及CIA值揭示了朗赛岭爬坡沙丘处于化学风化的初期，A-CNK-FM图则表明Fe、Mg元素在空间上存在差异，是差异风力风选的结果。从化学风化指标来看，从河漫滩到迎风坡，沉积物的风化程度增强。综上所述，物源和风动力是导致爬坡沙丘粒度和化学元素存在空间差异的重要因素，朗赛岭爬坡沙丘属于近源沙丘，沙源主要是雅鲁藏布江河流相沉积物，不同地貌部位沉积物特征的差异性是对风、水交互作用的积极响应。

In order to reveal the formation process， material source and sedimentological significance of the climbing dunes in the Shannan wide valley section of Yarlung Tsangpo River， cross-sectional sampling was conducted on the climbing dunes of Langsailing， and the particle size and geochemical elemental characteristics of the climbing dunes sediments in different topography parts were analyzed. The results show that the grain size composition of the surface sediments of the climibing dunes is mainly fine and medium sands， while the river floodplain and terraces show obvious wind-water interaction， and the windward and leeward slopes show obvious aeolian characteristics； The particle size characteristics are different in different terrain. The particle size gradually becomes finer and better sorted from the riverbed to upwind slope， while the opposite trend is observed from upwind slope to the leeward slope. The geochemical element composition of the sediments is dominated by Si， Al， Fe and Na， and the small difference in the climbing dune section indicates that they have similar depositional environment. Compared with the upper continental crust （UCC）， all the elements are deficient except Si. The A-CN-K ternary diagram and CIA index reveal that chemical weathering of the surface sediments is in the early stage， while the A-CNK-FM diagram indicates that the spatial distributions of Fe and Mg elements are spatially different， which is the result of sorting action of wind. From the chemical weathering index perspective， the weathering of the sediment is enhanced from the river bed to the windward slope. In summary， material source and wind dynamics are important factors leading to the spatial differences in grain size and chemical elements. Therefore， we determine the climbing dunes of Langsailing are near-source dunes， and the material source is mainly from the river sediments of the Yarlung Tsangpo River. Meanwhile， the variance of sediment characteristics at different topography part are the active response to the interaction of wind and water.