Fig. 1

The relationship between carbon stock and tree cover for 6 of the 14 global biomes using global datasets (black regression line and gray points). The red lines for total carbon indicate the assumed increase in tonnes of C per hectare for every increase in tree cover in the original analysis, while the red lines in aboveground carbon represents the original estimates minus the fraction of soil organic carbon. The global datasets were randomly sampled for land points within protected areas globally and querying the aboveground biomass, 1 m soil organic carbon, percent tree cover, and the corresponding biome. Aboveground biomass was converted to carbon stock by multiplying by 0.5. Total carbon is aboveground carbon plus soil organic carbon for each queried point. Note the difference in scales of the y-axis (see Fig. 2 for relationships of all 14 biomes)