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The carbon cycle is significantly affected by  Spartina alterniflora  invasion through its impact on blue carbon in many salt marshes. To determine the impacts on soil organic carbon (SOC), we studied the vertical and horizontal distribution of SOC. And stable carbon isotopes were used to explore the impact of the age of  S. alterniflora  invasion on SOC in Chongming Dongtan wetland located in the Yangtze River estuary, China. The results showed that the SOC concentration was higher in the  S. alterniflora  community than that in the native  Phragmites australis  community. The age of invasion and the SOC concentration increased with increasing elevation, while the SOC concentration decreased with increasing soil depth. The δ 13 C value became less negative at greater depth, which was related to the contribution from  13 C- enriched carbon sources after 3 years of invasion. After 7 and 10 years, the δ 13 C value became more negative at greater depth in both communities.  S. alterniflora  had a positive effect on the soil carbon pool, and its contribution was related to soil depth. In the low tidal marshes, the contribution of  S. alterniflora  was negatively correlated with soil depth, while it was positively correlated with soil depth in the high tidal marshes. The results from this study will contribute to improved understanding of future ecological consequences.

Spartina alterniflora invasion affects soil carbon in a C3 plant-dominated tidal marsh