Figure 1 : The relationship between soil organic carbon density (mg cm−3) and depth in urban soils.

From: Organic carbon hidden in urban ecosystems

Figure 1

Capped soils represented by open square data points (□); herbaceous soils represented by open circular data points (), and; tree and shrub soils represented by open triangular data points (Δ). The vertical lines indicate the depth below which the fitted curve was applied to (a) areas of non-vehicle load bearing impervious surface, (b) urban greenspaces (c) vehicle-load bearing impervious surface.