Activation energy for hydrolytic and oxidative enzymes.

<p>E_a in (a) A horizon and (b) B horizon for β-glucosidase (BG), cellobiohydrolase (CB), peroxidase (PER) and phenol oxidase (POX). Activation energy calculated from three subsamples taken from each soil and depth combination. The number of study locations per biome were tropical n = 2; temperature n = 3; subarctic n = 1; arctic n = 1. The “*” indicates a significant effect of biome with a 0.05≤<i>P</i>≤0.1 and “**” indicates a significant effect of biome with a <i>P</i>≤0.01.