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Mangroves are critical in global carbon budget while vulnerable to exotic plant invasion.  Spartina alterniflora , one of typical salt marsh plant grows forcefully along the coast of China, has invaded the native mangrove habitats in Zhangjiang Estuary. However, the effects of  S .  alterniflora  invasion on soil carbon gases (CH 4  and CO 2 ) emission from mangroves are not fully understood. Accordingly, we conducted a field experiment to investigate the soil CH 4  and CO 2  emission during growing seasons in 2016 and 2017 at four adjacent wetlands, namely bare mudflat (Mud),  Kandelia obovata  (KO),  Avicennia marina  (AM) and  S .  alterniflora  (SA). Potential methane production (PMP), potential methane oxidation (PMO), functional microbial abundance and soil biogeochemical properties were measured simultaneously. Our results indicate that  S .  alterniflora  invasion could dramatically increase soil CH 4  emissions mainly due to the enhancement in PMP which facilitated by soil EC, MBC, TOC and  mcrA  gene abundance. Additionally,  S .  alterniflora  invasion decreases soil CO 2  emission. Both heterotrophic microbial respiration ( 16S rRNA ) and methane oxidation ( pmoA  and  ANME-pmoA ) are responsible for CO 2  emission reduction. Furthermore,  S .  alterniflora  invasion greatly increases GWP by stimulating CH 4  emissions. Thus, comparing with mangroves, invasive  S .  alterniflora  significantly ( p  < 0.001) increases CH 4  emission while reduces CO 2  emission.

Exotic Spartina alterniflora invasion increases CH4 while reduces CO2 emissions from mangrove wetland soils in southeastern China