Figure 3.

Sum of Akaike weights of four moderator variables from multi-level meta-analytic models for biomass responses in experiments examining warming and drought effects. The higher the Akaike weights, the greater is the importance of the variable in explaining the variation of an effect size. The statistical significance of a given moderator variable is indicated by an asterisk, and when those without any asterisk sign are non-significant. Asterisks represent p-values < 0.05 (*) or p-values < 0.01 (**). (Online version in colour.)