Fig. 4. Global patterns of surface SOC stocks (SOCS) (0-20 cm) of mid- and large cities and national estimates of SOCS in urban greenspaces.

a Predicted SOCS of urban greenspaces for mid- and large cities (urban population > 0.5 million) (Supplementary data 1). b, c Total SOCS (b) and urban greenspace areas (UGSA) (c) estimated for the globe and top ten countries. The size of brown circle in Fig. 4a indicates the variations of predicted SOCS. Error bars in Figs. 4b and 4c represent the 95% confidence intervals. The estimates of national SOCS were based on the total national areas of urban greenspaces (Supplementary data 2).