Coastal wetlands are sensitive to global climate change and may play an important role in the global carbon cycle.However,the dynamics of carbon cycling in coastal wetlands and its response to LUCC is still poorly understood.In this study,the influence of LUCC from native reed wetland to tidal aquaculture land,paddy field,grassland,abandoned land and pond aquaculture land on sediment or soil(0-50 cm) organic carbon and labile soil organic carbon(LSC) concentration was investigated in the wetland of Min River estuary.The results showed that the concentration of SOC in 0-50 cm soil layer under tidal aquaculture land,paddy field,pond aquaculture land,grassland and abandoned land was 27%,75%,67%,1%,60% lower than that under native reed wetland,respectively.When native reed wetland was converted to tidal aquaculture land,paddy field,pond aquaculture land and abandoned land,the SOC stocks decreased by 11%,50%,37% and 24%,but when native reed wetland was converted to grassland SOC stocks was increased by 44%.The decreasing magnitude of SOC concentration and SOC stocks with soil profile depth under grassland was greater than native reed wetland.Vertical distribution characteristic of SOC concentration and SOC stocks under paddy field was not distinctness;the SOC concentration(0-30 cm layer) increased when paddy field was abandoned,Vertical distribution characteristic of SOC concentration was distinctness.In general,the difference in LSC among the different land use types and changes with depth were greater for the SOC concentration.The concentration of LSC under tidal aquaculture land,paddy field,pond aquaculture land and grassland was 24%,83%,84%,42% lower than that under native reed wetland,respectively.The concentration of LSC was increased by 47% when paddy field was abandoned.