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Many studies have found that plant invasion can enhance soil organic carbon (SOC) pools, by increasing net primary production (NPP) and/or decreased soil respiration. While most studies have focused on C input, little attention has been paid to plant invasion effects on soil respiration, especially in wetland ecosystems. Our study examined the effects of  Spartina alterniflora  invasion on soil respiration and C dynamics in the Yangtze River estuary. The estuary was originally occupied by two native plant species:  Phragmites australis  in the high tide zone and  Scirpus mariqueter  in the low tide zone. Mean soil respiration rates were 185.8 and 142.3 mg CO 2  m −2  h −1  in  S .  alterniflora  and  P .  australis  stands in the high tide zone, and 159.7 and 112.0 mg CO 2  m −2  h −1  in  S .  alterniflora  and  S .  mariqueter  stands in the low tide zone, respectively. Aboveground NPP (ANPP), SOC, and microbial biomass were also significantly higher in the  S .  alterniflora  stands than in the two native plant stands.  S .  alterniflora  invasion did not significantly change soil inorganic carbon or pH. Our results indicated that enhanced ANPP by  S .  alterniflora  exceeded invasion-induced C loss through soil respiration. This suggests that  S .  alterniflora  invasion into the Yangtze River estuary could strengthen the net C sink of wetlands in the context of global climate change.

Effects of Spartina alterniflora Invasion on Soil Respiration in the Yangtze River Estuary, China