Authors:
E. M. PERMINOVA, junior researcher,
E. M. LAPTEVA, doctor of biological sciences, associate professor, head of department,
Institute of Biology Komi SC, Russian Academy of Science, Ural branch (28 Kommunisticheskaya str., 167000, Syktyvkar; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it., This email address is being protected from spambots. You need JavaScript enabled to view it.)
Abstract. The paper reveals the mechanism of catalytic activity changes in podzolic texturally-different soils from middle taiga spruce and different-aged deciduous-coniferous stands after clear cutting. The highest catalytic activity level (8.4–16.9 cm3 О2 ·g-1·min-1) attributes to upper organic soil horizons which are not as acidic (pH 4.7) as mineral podzolic part (pH 4.0) but contain large amounts of organic carbon and nitrogen (about 36.4 % and 1.56 % respectively). Organic soil horizons contain average amounts of catalase whereas mineral horizons are poor or even extremely poor by catalase. Share of enzyme (catalase) component in total catalytic activity varies from 47 to 63 %. In mineral soil part, catalase activity decreases by 6.8–10.2 times and, consequently, non-enzyme catalysts preferably respond for total catalytic activity. There are no significant differences by catalytic activity parameters in organic soil horizon between young deciduous-spruce after-cut and native spruce forest. But both total catalytic activity and catalase activity tend to increase in organic soil horizon under mature birch herbaceous stand which is forty years old. The catalase soil activity coefficient calculated as the ratio of catalase activity in podzolic horizon to total catalase activity in organic and mineral soil parts is an instable value which varies from zero to 8–12 % depending on collection terms. By ANOVA (analysis of variance), the main factors affecting the soil catalase activity level are weather, soil horizon, and collection terms. Type of community does not seriously impact the activity of catalase enzyme.
Keywords: middle taiga, spruce forests, clear cutting, podzolic soils, enzymatic activity of soils, catalase.
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