Extended Data Fig. 3: Temperature dependence of the CH4:CO2 emission ratio (EM:C) at different water table depth intervals and soil C:N intervals.

The temperature dependence was characterized using the linear mixed effects (LME) model after fitting the Boltzmann-Arrhenius function to the data of the CH4:CO2 emission ratio and the standardized temperature (Methods). Different soil C:N intervals were classified using the results of the sliding window-LME model. Different water table depth intervals are classified according to the results of Chen et al. (ref. 3, 10.1038/s41558-021-01108-4).