Fig. 9: Changes in selected ecosystem properties across climates and time.
From: The influence of soil age on ecosystem structure and function across biomes

Changes in soil C stocks, N:P ratios, and total microbial biomass (mean ± SE) across soil ages and biomes (n = 5 replicates per chronosequence stage). C stocks in kg C m−2; microbial biomass in nmol PLFA g−1 dry soil. Soil age (years) in brackets. Green circle = temperate; yellow circle = arid; blue circle = cold (continental and polar); red circle = tropical.