A long-term analysis (1951-2013) was conducted on the fixed wetlands (i.e., the areas that remained
wetlands from 1978 to 2008) to investigate the effects of precipitation and temperature on wetland
CH4 emissions. The correlation coefficient and the significance level between the CH4 emission rate
and precipitation or temperature were calculated for each wetland grid cell, and only those grid cells
with statistical significance and a determination coefficient greater than 0.3 are shown in Figure 3b,