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| 1 | The redox potential of soils seems to be a critical environmental factor because it governs the chemical and biochemical form of many compounds and their availability for plants and soil microorganisms. Dissolved and total organic carbon, total nitrogen and activity of reeducates, xanthine oxidase, phenol oxidase and peroxides were determined in the peat samples. The aim of this study is to compare the activity of enzymes participating in redox potential at two depths of profile Tagan peatland: acrotelm and catotelm. The study has shown the impact of two depths of profile peatland on activities enzymes participating in redox potential like nitrate reductase, xanthine oxidase, phenol oxidase and peroxidase. In soil profiles activity of xanthine oxidase, phenol oxidase and peroxidase increased with the depth in the points 2, 3 and 4 and also xanthine oxidase in point 1. Together with extending into the depth of soil, there was the increase in nitrate reductase activity in points 1, 3 and the decrease in points 2, 4. Keywords: peat soils, activity of nitrate reductase, xanthine oxidase, phenol oxidase and peroxidase | 1051 | ||||