Table 1.
Soil characteristics and environmental variables.
Table 2.
Activation Energies (kJ mol−1) with standard error in parentheses (analytical replicates n = 8 for BG, CB; n = 16 for PER, POX) for extracellular enzymes. “*” indicated n = 1.
Figure 1.
Activation energy for hydrolytic and oxidative enzymes.
Ea 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≤P≤0.1 and “**” indicates a significant effect of biome with a P≤0.01.
Table 3.
Linear and polynomial regression statistics relating Ea for four enzymes to four different environmental variables.
Figure 2.
Hydrolytic and oxidative enzyme activities in the A horizon.
Enzyme activities at (a) 4°C, (b) 21°C, and (c) 30°C for hydrolytic enzyme activities in order by average air temperature 30 days prior to sampling. Oxidative enzyme activity at (d) 4°C, (e) 21°C, and (f) 30°C in order by average air temperature 30 days prior to sampling.