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Construction and scientific implementation of mathematical models for tree compartments of broadleaved trees in growth stages of seedlings and young stand
Pajtík, Jozef ; Konopka, Bohdan (advisor) ; Monika, Monika (referee)
Importance of precise estimation for tree biomass in forests has been continuously increasing. Regarding to the climate change, scientists have started to quantify all tree components not only in terms of energetic utilization but also for carbon stock estimation. Increasing relevance of biomass models for young trees relates to expanding area of young forest stands during the last period due to decay of old forests often caused by disturbances (especially: windstorms, outbreaks of bark beetles, drought episodes, and forest fires). Models for biomass stock estimations constructed for stands with age to 10 years are rare and usually are focused on aboveground tree parts. Thus, this work aims at filling knowledge gaps in this field. Its main objectives are:
1) construction of regression models applicable for estimation of dry mass in the particular tree components (i.e. stem, branches, foliage, roots) for young stands of some broadleaved species,
2) implementation of regression models for calculation of biomass conversion and expansion factors (BCEF), allocation coefficient, growth efficiency and leaf area index (LAI) and their inter-specific comparison,
3) utilisation of allometric relations for estimation on forage potential for ruminating ungulate game (i.e. browsing and stripping).
To make up the models, destructive tree sampling will be implemented. The sample trees will be excavated, separated into tree components, dried for constant weight and weighed. Log-transformed relationships will be used for construction of regression models.
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The Production and Ecological Potential of Pine Stands on Anthropogenic Soils of Post-Mining Sites
Dragoun, Lukáš ; Merganič, Ján (advisor) ; Konopka, Bohdan (referee)
Extraction of mineral resources constituted the development of industrial companies worldwide. But it has a major impact on the landscape and environment. Restoration of areas disturbed by mining is current issue especially on large surfaces after surface mining. In the Sokolov region, the forest reclamation was carried out on the Antonin spoil bank in the years 1969-1972, where forest stands of different species composition were established under the same conditions. The aim of this work is to compare the mixed pine stands on anthropogenic soils more than 40 years after their foundation, to assess their suitability for reclamation and to describe the influence of admixed deciduous trees on the production and ecological potential of the site. On the plots the basic mensurational and production quantities of the stand were measured. The dendrochronological analysis was performed and the diameter increment was detected for the main species Scots pine. Based on the diameter increment, the tolerance analysis was carried out for the highest risk factor on these sites - drought. The most appropriate in local conditions seems to be a structure of pine stands with an admixture of lime trees, which is characterized by the highest production, soil formation and ecological potential. The work also points to two important factors that significantly influenced the silviculture on the Antonin spoil bank. It is the neglect of stand tending, and thus significant disruption in stand stability, and limiting intake of water, causing significant declines in increment regardless of an admixture or character of the stands.
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