Figure 3. Effects of aridity on the relationships between plant
species richness and ecosystem functioning. Relationships between plant
species richness and aboveground biomass (a) and SOC (b), and effects of
plant species richness on ecosystem functions (c, the slope of the
relationships between plant species richness and aboveground biomass and
SOC) along aridity gradients. * P ≤0.05,** P ≤0.01, ***P≤0.001.