Title：
Impacts of Spartina alterniflora invasion on soil organic carbon andnitrogen pools sizes, stability, and turnover in a coastal salt marsh ofeastern China
tPlant invasion may impact ecosystem structure and function, and further affect soil organic matter (SOM)dynamics. However, the influence of plant invasion on soil organic carbon (C) and nitrogen (N) poolssizes, stability, and turnover in SOM of invaded ecosystems is not fully understood. In this study, soil Cand N contents, and 13C and 15N values of free light fraction (LF), intra-aggregate particulate organicmatter (iPOM) and mineral-associated organic matter (mSOM) were investigated in an invasive Spartinaalterniflora community, adjacent bare flat and native Suaeda salsa and Phragmites australis communities.Short-term S. alterniflora invasion significantly enhanced organic C and N contents in SOM, free LF, iPOM,mSOM compared with bare flat and increased the proportion of allocated C in iPOM compared withS. salsa and P. australis soils (0–0.30 m depth). The proportion of the S. alterniflora-derived C in free LFand iPOM were significantly higher than that in mSOM, and the highest S. alterniflora-derived C contentwas found in iPOM of S. alterniflora soil. The most enriched 15N values were found in S. alterniflorasoil. Increased 15N values and decreased C:N ratios from the free LF to iPOM to mSOM in S. alterniflorasoil indicated a greater degree of decomposition. The results suggest that 10-year S. alterniflora invasionsignificantly alters soil organic C and N pools sizes and stability through changing plant residuals input,physical distribution of S. alterniflora-derived C and C turnover in SOM fractions.
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