Sedimentation is a key process affecting wetland sustainability and carbon burial flux. In context of sea level rise, climate change and human activities, further understanding about the sedimentary dynamic in wetland is critical in predicting the landscape evolution or the change in carbon burial flux. In this study, based on the field hydrological observation in a mangrove system in the Nanliu River estuary, we found the net flux of suspended sediment to mangrove is 39–72 kg/m in tidal cycles with Turbidity Maximum Zone (TMZ) forming in surface layer and only is 9–18 kg/m in tidal cycles without TMZ. The higher net flux of suspended sediment to mangrove in tidal cycles with TMZ forming in surface layer is attributed to high SSC in rising tide and intense flocculation in mangrove. The significant discrepancy in sedimentation rate in the mangrove patches also can be explained by the probability of TMZ forming in the surface layer of estuary. In future, rapid sea level rising may lead to the change of TMZ pattern in estuary, which will result in non-negligible variation in sedimentation rate in wetlands. According to the present data of sedimentation rate in wetlands, the fragility of wetlands in river estuary may be miscalculated.

沉积是影响湿地可持续性和碳埋藏通量的关键过程。在海平面上升、气候变化和人类活动的背景下，进一步了解湿地沉积动态对于预测景观演变或碳埋藏通量的变化至关重要。本研究通过对南流河口红树林系统的现场水文观测，发现潮汐循环中悬浮泥沙对红树林的净通量为39~72 kg/m，并在地表形成最大浊度带（TMZ）。层，并且在没有 TMZ 的潮汐周期中仅为 9-18 kg/m。在潮汐循环中，表层形成TMZ，悬浮沉积物向红树林的净通量较高，这归因于涨潮时的高SSC和红树林的强烈絮凝。红树林斑块沉积速率的显着差异也可以用河口表层形成TMZ的可能性来解释。未来，海平面快速上升可能导致河口TMZ格局发生变化，从而导致湿地沉积速率发生不可忽视的变化。根据现有的湿地沉积率数据，河口湿地的脆弱性可能存在误判。