The high carbon (C) sequestration potentials of coastal wetlands play an important role in mitigating climate change associated with the greenhouse effect. In the present study, soil samples were collected from the 0–30-cm topsoil layers and from 0 to 100-cm cores for the analysis of the spatial dynamics and vertical distribution of organic carbon (OC) and biomass in different vegetation zones in a small tidal basin in Chongming Dongtan wetland. According to the results, sediments in the region were a mixture of terrestrial and marine sources and the proportions of terrestrial components decreased with an increase in depth. In addition, soil properties were quite similar in the top-soil layer. In the study area, the OC concentration was in the 0.7–10.93 g/kg range, which was positively correlated with halophyte biomass and negatively correlated with soil salinity and particle size. Furthermore, OC content decreased with an increase in depth. The OC content in different halophyte communities was in the order of Phragmites australis community > Mixed community > sedge community, and was consistent with the gross biomass. The total C sequestered of 100-cm depth in the area was 31,177 ton, with the P. australis community, mixed community, sedge community, and water sequestering 57.7, 49.2, 25.5 t/ha, and 8 t/tidal cycle, respectively. Tidal marshes in Chongming Dongtan exhibited a high C sequestration capacity, indicating that they play a major role in the C cycle in the Yangtze Estuary.

沿海湿地的高碳（C）固存潜力在缓解与温室效应有关的气候变化中起着重要作用。在本研究中，从0–30 cm表土层和0至100 cm岩心中收集土壤样品，以分析土壤中不同植被带中有机碳（OC）和生物量的空间动态和垂直分布。崇明东滩湿地小潮池。根据结果​​，该地区的沉积物是陆源和海洋的混合物，并且随着深度的增加，陆地成分的比例下降。此外，表层土壤的土壤性质非常相似。在研究区域中，OC浓度在0.7-10.93 g / kg范围内，与盐生植物生物量呈正相关，与土壤盐分和粒径呈负相关。此外，OC含量随着深度的增加而降低。不同盐生植物群落中的OC含量为芦苇群落>混交群落>莎草群落，与总生物量一致。该地区100 cm深度的固碳总量为31,177吨，其中澳大利亚磷虾社区，混合社区，莎草群落和水固存分别为57.7、49.2、25.5 t / ha和8 t /潮汐周期。崇明东滩的潮汐沼泽表现出较高的碳固存能力，表明它们在长江口的碳循环中起主要作用。