The mean annual magnitudes and trends of wetland CH 4 emissions estimated by TD and BU models, compared with those of the upscaled wetland CH 4 emissions (red circle). For TD models, dark-blue markers indicate that the trends are significant, that is, P < 0.05, and light-blue markers indicate that the trends are not significant, that is, P > 0.05. For BU models, orange markers indicate that the trends are significant, and yellow markers indicate that the trends are not significant. The P values can be seen in Supplementary Table 5, obtained from a two-sided t-test.
