Catalase activity of podzolic soils and its changes in conditions of natural reforestation at spruce forest cuts in the middle-taiga zone

The present paper reviews vegetation cover restoration at clear-cut bilberry spruce forests and how it impacts the catalytic activity of texturally-differing podzolic soils. The catalytic activity variation parameters were identified for soils under native bilberry spruce forest and secondary deciduous-coniferous stand formed instead of forest cut in 2001/2002. In organic horizons of podzolic soils, contribution of catalase activity into total catalytic activity made 47-55 % and 25 % in mineral podzolic horizons. The highest catalase activity was found for organic soil horizons whereby in mineral horizons it was less by 6,5-8,3 times. There was no statistically true difference in catalase activity value between soils under native and cut stands. Enzyme activity parameters were largely impacted by annual weather conditions, not anthropogenically.