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Analýza tvorby dřeva buku lesního (Fagus sylvatica L.) na buněčné úrovni na výzkumné ploše Rájec - Holíkov
Porvalík, Radim
The content of this diploma thesis is the analysis of the formation of beech wood (Fagus sylvatica L.) at the cellular level, ie xylogenesis in the research area Rájec - Holíkov, which is located in the Drahanská Highlands. Specifically, this study focused on the activity of cells in the cambial zone and the differentiation of the new annual ring on individual days (DOY) during the 2016 growing season compared to 2015, when samples were taken (Trephor tool) regularly once a week using so-called micro-bore. Permanent microscopic slides were created from these, which were subsequently examined. The activity of cells in the cambial zone was started in 2015 and 2016 in the last week of April at a temperature of 8.3 ° C. The zone of secondary cell wall (SW) formation and gradual cell lignification was evident two weeks after the onset of postcambial growth until the end of August. After the application of the Gompertz function, the creation of a new annual ring took an average of 91 days in 2015 and its size was 1252.7 μm. The year 2016 was similar, the size was 1229.2 μm. The average time of creation of a new annual ring was higher, namely 117 days.
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MICROCLIMATIC INFLUENCES ON WOOD PHENOLOGY OF TREES AND SHRUBS IN TREELINE ECOTONE
Hejda, Tomáš ; Treml, Václav (advisor) ; Chuman, Tomáš (referee)
This thesis deals with the influence of microclimatic conditions (air temperature near tree/shrub top, temperature of the stem and root zone) on the wood phenology of trees (Picea abies) and shrubs (Pinus mugo) growing on the same site in the alpine tree line (ATL) ecotone. Phenological and microclimatic research was carried out in the Giant Mountains at 1,370 m a. s. l. in the 2017 vegetation period, with the aim to compare the course of wood formation depending on the microclimate, to determine the temperature thresholds of wood growth and differences in the morphology of trees and shrubs. Based on the microclimate analysis of trees and shrubs, individual variables were determined (average, average minimum, average maximum, daily amplitude of air, stem and root zone temperatures) characterizing the growing season. The collection of micro-drills of trees and shrubs took place from April to October in an interval of 6 - 11 days, which were subsequently processed and examined in the laboratory. The following phenophases of wood development were distinguished: cambial, enlarging, wall-thickening, mature cells and cells of the previous ring. Subsequently, differences in the number of cells of individual phenophases were identified between trees and shrubs. Furthermore, the temperature thresholds for...
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