Figure 4. The ln of the soil organic matter (ug SOM g⁻¹ dry soil) versus the ln of the microbial biomass carbon (ug MBC g⁻¹ dry soil) for all of the samples (pane 1), at the six sites (panes 2–7), and regional effects (pane 8).

Significant relationships have been noted for panes 1 and 8 (*) and a ≠ in panes 2–7 indicates that the within site relationships are statistically different across sites (i.e. a local contextual effect was found).