Disturbance increases ecosystem functioning in productive habitats but its effect in stressful conditions is less documented, although this is crucial for understanding the resilience of disturbed systems to natural and anthropogenic disturbances. Our goal is to assess the influence of physical disturbance for ecosystem functioning in coastal sand dunes. We set up an experimental design, including two treatments in four blocks, in a four km-long dune site from South West France. We simulated physical disturbance from marine and wind origin, digging Experimental Notches (EN), in the incipient (West EN treatment) and established foredunes (East EN treatment), respectively and compared the effects of EN to controls along transects including 13 positions from the beach to the transition dune behind ENs. We sampled litter decomposition rate, elevation variation, wind abrasion, sand grain size and vegetation composition. We also used drones to quantify sand deposition sheets during severe winter storms. Litter decomposition rate was the highest where sand accumulated the most, at the ecotone between the established foredune and transition dune and in the East EN treatment. This increase of ecosystem functioning was correlated to wind patterns. However, there was also a strong alongshore variability, with important sand deposition sheets occurring in some blocks depending on dune geomorphology. Vegetation composition was mainly influenced by shoreline distance, but also by the block and EN treatment, with a strong interaction between these three effects. We conclude that physical disturbance increase ecosystem functioning in the stressful conditions of the Atlantic sand dunes, only when sand accumulates, whereas excessive disturbances enhancing sand erosion are not favorable for ecosystem functioning.

干扰增加了生产性生境中的生态系统功能，但在压力条件下的影响却鲜有记载，尽管这对于了解被干扰系统对自然和人为干扰的适应能力至关重要。我们的目标是评估物理干扰对沿海沙丘生态系统功能的影响。我们在距法国西南部四公里长的沙丘站点中建立了一个实验设计，包括在四个街区中进行两种处理。我们分别模拟了来自海洋和风源的物理扰动，在初始阶段（西部EN处理）挖出了实验缺口（EN），并建立了预警（东部EN处理），并比较了EN与沿样线的控件的影响，包括从该位置的13个位置到达EN后面的过渡沙丘。我们采样了垃圾分解率，海拔变化，风蚀，沙粒大小和植被组成。我们还使用无人驾驶飞机来量化冬季严峻风暴期间的沙尘沉积量。在既定的前沙丘和过渡沙丘之间的过渡带以及东部EN处理中，凋落物的分解率最高，其中沙子堆积最多。生态系统功能的增加与风型相关。但是，沿岸也存在很大的变化性，根据沙丘的地貌，一些区块中会出现重要的沙粒沉积。植被组成主要受海岸线距离的影响，但也受区块和EN处理的影响，这三种影响之间的相互作用很强。我们得出结论，在大西洋沙丘的压力条件下，物理干扰会增加生态系统的功能，