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EFFECT OF pH ON THE RELEASE OF ORGANIC MATTER FROM MUCKS // Tomsk State Pedagogical University Bulletin. 2009. Issue 3 (81). P. 105-109

The effect of high pH values on the release of organic matter (OM) from mucks was investigated. This study was conducted on homoionic hydrogen forms of 7 mucks (Terric Histosols). Concentration of dissolved organic matter (DOM) released were determined colorimetrically at l=465 nm. Parameters Q2/6 and Q4/6 were calculated from spectra in visible region. The dissolution of soil OM was significantly affected by pH. The relationship could be satisfactorily described by the equation: DOM = 0.01Чexp(b1ЧpH). The b1 parameter quantified the DOM release process in relation to the changes in soil pH. The investigations proved correlations among W1, Q and b1 indexes.

Keywords: dissolved organic matter (DOM), mucks, pH, state of secondary transformation

Function of peatland located on secondary transformed peat-moorsh soils on the rates of the elution of organic matter // Tomsk State Pedagogical University Bulletin. 2011. Issue 5 (107). P. 144-149

The elution of soil organic matter from 4.5 km long consisting peat-moorsh soils transect in broad range of pH was investigated. This transect is located in the Agroecological Landscape Park in Turew, 40 km South-West of PoznaD, West Polish Lowland. There is this transect along Wysko ditch. pH and pseudo first-order reaction constants were measured. Peat-moorsh soils were described and classified according to Polish hydrogenic soil classification and World Reference Base Soil Notation. There are four investigated points along to Wyskoc ditch. Two times a month during entire vegetation season the following material was taken from this four chosen site – samples of peat, from the depth of 0–20 cm. The rates of the reaction were calculated from the kinetics of first order reaction model. All experiments were repeated at different pH 6.0, 6.5, 7.0, 8.0, 8.5 of 0.5 M ammonium acetate buffer solution. The rates of organic matter elution for all samples of peats were significant different at four used wavelengths » = 272 nm, » = 320 nm, » = 465 nm, and » = 665 nm. It was observed that the rates increased between » = 272 nm and » = 320 nm and decreased from » = 465 nm to » = 665 nm.

Keywords: peat-moors soils, dissolved organic matter, kinetics of dissolved organic matter

ACTIVITIES OF ENZYMES PARTICIPATING IN REDOX POTENTIAL IN THE TWO DEPTHS OF TAGAN PEATLAND // Tomsk State Pedagogical University Bulletin. 2011. Issue 8 (110). P. 70-77

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