SOC decreased with increasing depth in the soil.
The SOC density averaged 65 kg C m− 3 in the top 1 m of the soil of wetland
The SOC stock in the top 1 m of wetland soils totaled 514 Tg C.
This stock was 8.3 to 10.2% of SOC in the top 1 m of the soils of China's wetlands.