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Enzyme dynamics are being incorporated into soil carbon cycling models and accurate representation of enzyme kinetics is an important step in predicting belowground nutrient dynamics. A scarce number of studies have measured activation energy (E a ) in soils and fewer studies have measured E a  in arctic and tropical soils, or in subsurface soils. We determined the E a  for four typical lignocellulose degrading enzymes in the A and B horizons of seven soils covering six different soil orders. We also elucidated which soil properties predicted any measurable differences in E a . β-glucosidase, cellobiohydrolase, phenol oxidase and peroxidase activities were measured at five temperatures, 4, 21, 30, 40, and 60°C. E a  was calculated using the Arrhenius equation. β-glucosidase and cellobiohydrolase E a  values for both A and B horizons in this study were similar to previously reported values, however we could not make a direct comparison for B horizon soils because of the lack of data. There was no consistent relationship between hydrolase enzyme E a  and the environmental variables we measured. Phenol oxidase was the only enzyme that had a consistent positive relationship between E a  and pH in both horizons. The E a  in the arctic and subarctic zones for peroxidase was lower than the hydrolases and phenol oxidase values, indicating peroxidase may be a rate limited enzyme in environments under warming conditions. By including these six soil types we have increased the number of soil oxidative enzyme E a  values reported in the literature by 50%. This study is a step towards better quantifying enzyme kinetics in different climate zones.

Activation Energy of Extracellular Enzymes in Soils from Different Biomes