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Vliv vybraných stanovištních faktorů na proteolytickou aktivitu lesních půd s důrazem na organické a anorganické látky
Holík, Ladislav
PhD thesis focuses on soil biochemistry, namely the effects of organic and inorganic substances on proteolytic ktivity in forest soils. The thesis is composed of several impacted journal articles and two manuscripts. Selected organic compounds feature L- and D-tartaric acid, phenolics, proteinogenic and non-proteinogenic amino acids, auxins and cytokinins, whilst inorganic substances are represented by salts. Furthermore, an article dealing with the effects of different forest management practises on soil enzymatic ktivity (including proteases) is adjoined. Its aim is to monitor the effect of forest regenerative elements (forest stand gaps) on enzymatic ktivity, whereas the intervention into forest ktivity changes the moisture and thermal conditions of the site. The results show that out of the organic substances tested L- and D-tartaric acid, proteinogenic and non-proteinogenic amino acids and auxins have a positive effect on the proteolytic ktivity. Conversely, phenols and cytokinins acted as inhibitors. Soil salinization also had a negative effect on proteolytic ktivity of forest soils. The Influence of forest management through forest regenerative elements on soil protease ktivity was not detected. Potential urease ktivity was the only enzyme that reacted to the change of climatic conditions of forest habitat; however, ktiv not a principal topic of this work.
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