Topographic heterogeneity provides a potential opportunity for seedling recruitment in the disturbance-dynamic ecosystem. Micro-topography manipulation is the typical way to imitate or recover the natural topographic heterogeneity for the degraded salt marsh restoration. However, it is still not clear how different micro-topographic structures work along the lateral gradient of a tidal creek. In this study, we performed three micro-topographic treatments, i.e., hollow topography, fine and coarse biotic grille structures, to restore the degraded Suaeda salsa wetlands. The results showed that the effectiveness of micro-topography restorations varied with structures and elevation levels. The hollow topography performed well in high marshes by relieving salinity stress and enhancing seeds retention. Moreover, in middle and low marshes, fine biotic grille structure improved the seeds retention and soil conditions better, including soil salinity and moisture, which were critical physico-chemical factors for Suaeda salsa biomass restoration according to redundancy analysis. In contrast, coarse biotic grille structure showed little significance on Suaeda salsa restoration. The findings of this work emphasized that seeds retention and post local soil conditions were significant aspects for salt marsh restoration. Meanwhile, it provided an alternative design for micro-topographic structures by native biotic materials in the complex and dynamic salt marshes.

地形异质性为干扰动态生态系统中的幼苗募集提供了潜在的机会。微观地形操纵是模仿或恢复自然地形异质性以降低盐沼恢复的典型方法。然而，尚不清楚不同的微地形结构如何沿着潮汐小溪的横向梯度工作。在这项研究中，我们进行了三种微观地形处理，即空心地形，精细和粗糙的生物格栅结构，以恢复退化的Suaeda salsa湿地。结果表明，微地形修复的有效性随结构和海拔高度而变化。通过缓解盐分胁迫并增强种子滞留性，中空地形在高沼泽地区表现良好。此外，在中，低沼泽地，细格栅生物结构提高的种子保持和土壤条件更好，包括土壤含盐量和水分，这是关键的物理化学因素碱蓬根据冗余分析生物量恢复。相比之下，粗糙的生物格栅结构对Suaeda salsa的意义不大恢复。这项工作的结果强调，种子的保留和当地土壤状况是盐沼恢复的重要方面。同时，它为复杂动态的盐沼中的天然生物材料提供了微地形结构的替代设计。