Fig. 1: Global patterns and shifts in forest age between 2010 and 2020.
From: Global covariation of forest age transitions with the net carbon balance
a,b, Average forest age for 2010 and 2020 at a one-degree pixel resolution (a) and the total area of each forest age class for 2010 (blue) and 2020 (green) (b). The total area represents the median values across the 20 ensemble members, with error bars in b indicating the 5% and 95% quantiles of the total area across the ensemble. c, The forest age difference map between 2020 and 2010, relative to the expected 10-year ageing. This map was calculated by subtracting ten years from the difference between 2020 and 2010. A value of zero indicates that forests have aged as expected over the decade, consistent with the gradual maturation of undisturbed forests. Positive values indicate slower-than-expected ageing or ageing stagnation, potentially due to disturbances. By contrast, negative values reflect forests becoming younger, probably due to stand replacement, disturbances or shifts in forest composition favouring younger stands. In a and c, the median estimates across the 20 ensemble members are shown. One-degree grid cells with less than 20% forest cover have been masked.
