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Understanding the functional relationship between greenhouse gas fluxes and environmental variables is crucial for predicting the impacts of wetlands on future climate change in response to various perturbations. We examined the relationships between methane (CH 4 ) emission and temperature in two marsh stands dominated by the  Phragmites australis  and  Cyperus malaccensis , respectively, in a subtropical estuarine wetland in southeast China based on three years of measurement data (2007–2009). We found that the  Q   10  coefficient of CH 4  emission to soil temperature ( Q   s10 ) from the two marsh stands varied slightly over the three years ( P  > 0.05), with a mean value of 3.38 ± 0.46 and 3.89 ± 0.41 for the  P .  australis  and  C .  malaccensis  stands, respectively. On the other hand, the three-year mean  Q   a10  values ( Q   10  coefficients of CH 4  emission to air temperature) were 3.39 ± 0.59 and 4.68 ± 1.10 for the  P .  australis  and  C .  malaccensis  stands, respectively, with a significantly higher  Q   a10  value for the  C .  malaccensis  stand in 2008 ( P  < 0.05). The seasonal variations of  Q   10  ( Q   s10  and  Q   a10 ) differed among years, with generally higher values in the cold months than those in the warm months in 2007 and 2009. We found that the  Q   s10  values of both stands were negatively correlated with soil conductivity, but did not obtain any conclusive results about the difference in  Q   10  of CH 4  emission between the two tidal stages (before flooding and after ebbing). There were no significant differences in both  Q   s10  and  Q   a10  values of CH 4  emission between the  P .  australis  stand and the  C .  malaccensis  stands ( P  > 0.05). Our results show that the  Q   10  values of CH 4  emission in this estuarine marsh are highly variable across space and time. Given that the overall CH 4  flux is governed by a suite of environmental factors, the  Q   10  values derived from field measurements should only be considered as a semi-empirical parameter for simulating CH 4  emissions.

Variations in Temperature Sensitivity (Q10) of CH4 Emission from a Subtropical Estuarine Marsh in Southeast China