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Qualitative evaluation of production and qualitative increment in stands at forest district Klokočná
Švec, Otakar ; Remeš, Jiří (advisor) ; Pulkrab, Karel (referee)
This thesis investigates the production and economic characteristics of forest stands in transformation process from even-aged forest stands to irregular forest stands. In the research area of Forest District Klokočná originally pure pine (Pinus sylvestris L.) and spruce (Picea abies L.) stands are being transformed to stands with complex forest structure characterized by selection harvest with the purpose of production and struc-tural equilibrium. Data was collected from eighteen 0.25 ha study plots; nine of them on forest develop-ment type (FDP) A -- acidic forest sites (predominantly 3K - Querceto-Fagetum aci-dophilum) and nine on FDP B -- waterlogged forest sites (predominantly 4P - Querce-to-Abietum variohumidum acidophilum). Within each study plot all woody stems of diameter more than 10 cm were measured. For each stem, the diameter in mm at 1.3 m above ground (dbh), the total height and the crown height (hypsometer Vertex, accuracy 0.1 m) were measured. For selected trees in particular diameter classes increment cores were sampled. For each FDP and stand structural segment a set of trees was sampled before and after the harvest and local assortment tables were crated for spruce and pine. Based on sampled data, financial value of standing timber, annual value incre-ment and target diameter for spruce and pine were calculated. Based on research results it is shown that lower homogeneity of forest stands has led to higher diameter increment of individual trees. On the contrary, negative effect of higher structural complexity of forest stands is lower quality of spruce timber in the range of 3 -- 4% per 1 m3. Generally better quality of pine and spruce timber, and thus also higher value, was confirmed for the FDP A. In this FDP target diameters for both investigated tree species are 8 -- 13 cm higher than for FDP B. It is concluded that forest transformation has strong impact on the production and eco-nomic characteristics of forest stands in the Forest District Klokočná, nevertheless studied forest stands still cannot be considered as stands with ideal selection structure in production and economic optimum. For future transformation efforts model charac-teristics differentiated according to site and structural characteristics are needed.
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Risk elements contamination in Kutná Hora region and possibilities of its usage in paleoenvironmental research
Horák, Jan ; Hejcman, Michal (advisor) ; Jaromír, Jaromír (referee)
The dissertation focuses on topic of using risk elements contamination as a stratigraphic marker in palaeoenvironmental research. The contamination is not studied only as itself, but is viewed as a way to analyse and interpret the sedimentary record of historical events. The contamination carries the information about its original place, its original activity, about development of the landscape.
The Kutná Hora region (central Bohemia; 49°57'0.170"N, 15°15'59.877"E) is a region of important historic mining and smelting activity. The mining started in 13th century and lasted until half of 16th century. Then only sporadic attempts of renewal were made. Spatially limited mining was renewed in second half of the 20th century. Therefore, it is highly probable to find here the contaminants in the role of stratigraphic markers. In the research were used mainly As, Be, Cd, Co, Cr, Cu, Hg, Pb, V and Zn as these are the most analysed in contamination studies performed in the region.
The aims of the dissertation were to answer these questions:
To characterize the contamination
- Are some risk elements typical for the contamination originating from the mining and smelting?
- If so, is their environmental (spatial, sedimentary) manifestation diversified?
- Is possible diversity spatially related to particular landscape features or areas?
- Is possible diversity connected to particular activities?
To use the answers in analysis of particular sites
- Is it possible to use the risk elements contamination as stratigraphic marker in fluvial sediments?
- How is the interpretation of particular site influenced by the whole context of regional contamination?
The core of the research is the metaanalysis of contamination data coming from region (the data obtained by our research and also from other studies). The results have brought not only basic characteristics of contamination, mainly concentrations. The crucial result was the structure of studied elemental complex. Only As, Cd, Cu, Pb and Zn are connected to contamination originating in mining and smelting. Other elements - their concentrations and spatial distributions - are uninfluenced by mining and smelting activities. More, the information about connection of As and Cd to mining and Cu, Pb and Zn to smelting was revealed. Both groups recorded with different spatial distributions. Also comparison of results by different approaches has shown that some statistical processing (clr-transformation) of such dataset was much better for interpretation than analyses of only concentrations values.
We studied also the area of confluence of two rivers - Klejnárka (main river draining contaminated region), which is tributary to Labe (Elbe) river. The contamination is still recognizable here, but the diversity between contamination elements is not. The confluence of rivers strongly dilutes the contaminated material. The concentrations decrease. Also here clr-transformation of data enabled to analyse structures of contaminants spatial distribution unrecognizable by concentrations values.
We performed also two vertical profiles analyses. It was shown, that it is highly risky to interpret data of such origin without the complex information about regional contamination context. It was revealed by contextual interpretation of data from one of the profiles, that there is a mixing of geochemical data coming from different statistical populations. The contamination works there as only one of the factors influencing sedimentary record. The site is therefore suitable for statistical testing of two populations mixing, outliers` detection and the like.
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The importance of vitamin D and calcium in the human diet
Bártová, Magdaléna ; Hejtmánková, Alena (advisor) ; Michlová, Tereza (referee)
Vitamin D refers to a group of fat soluble steroids. The most important forms are
cholecalciferol occurring in foods of the animal origin and ergocalciferol of the plant origin. Human
accept them in the diet; the fatty fishes, fish liver, and some other foods like milk, eggs or yeasts are
rich resources of vitamin D. Unlike the other vitamins, the synthesis of vitamin D can also take place
in the living body. Cholecalciferol is formed in the skin from its precursor 7 - dehydrocholesterol by
the effect of UVB radiation. The conversion efficiency depends on various factors.
Two successive reaction steps are necessary for the activation of vitamin D. The first step of
hydroxylation occurs in the liver to be formed calcidiol. Calcidiol is the principal form of vitamin D in
the blood acting also as the indicator of body supplies. The second one takes place in the kidneys
where calcidiol is transformed to calcitriol. Calcitriol is assumed as the active hormonal form of
vitamin D binding to the receptor for vitamin D - VDR. The best known and the most explored
function is the effect of vitamin D on the calcium and phosphorus homeostasis. Consequently, vitamin
D also influences the proper functions of muscles and the immune system. It reduces the risk of the
cancer and cardiovascular diseases by various mechanisms as well. However, there are assumed
another effects of vitamin D on the human body, which are not fully yet understood and are the subject
for further research.
Calcium constitutes the major mineral component of bones and teeth. It is an essential nutrient
and therefore it is necessary to supply it with food. Its content in foods is various as well as its
usability from these. The major resources of calcium are milk and dairy products. Calcium is also
present in eggs, mineral waters, certain fishes and food of plant origin. Especially, the plant resources
usability of calcium is limited because of the insolubility of some calcium complexes. Calcium is
essential for the composition structure of bones and teeth. Besides of structural function, it has a main
role in the blood coagulation, neuromuscular transmission or muscle contraction.
Vitamin D has an influence on the usability of calcium because of the efficiency increase of
calcium absorption in the intestine. The lack of both micronutrients leads to skeletal diseases -
osteoporosis, osteomalacia and rickets. The adequate intake of both essential part of food, vitamin D
and calcium, is important especially for the growing children, elderly people, and pregnant and
lactating women.
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The most important dietary sources of lipophilic vitamins
Šafránková, Simona ; Hejtmánková, Alena (advisor) ; Táborský, Jan (referee)
Basic piece of knowledge about nutrition and its need should be integral to every mans general knowledge. One of the vital nutritions ensuring a full-functioning organism are vitamins. Vitamins are essential ingredients, which play an important role in the human body and also in the processes of absorption and the exchange of substances between the external environment and living organism. They were discovered recently during the 20th century. The researches on their effects on the human body are still ongoing.
The vitamins are divided into two basic groups, water soluble vitamins, the so called hydrophilic (vitamins B and C), and fat soluble vitamins, the so called lipophilic (vitamins A, D, E and K).
The vitamin A is important to ensure good vision and recognizing colors. It support the quality and growth of bones, affects the egg and sperm and is needed for proper fetal development.
Vitamin A is found in foods of animal origin, such as dairy products, milk, meat and liver. In the food of plant origin, the vitamin A is replaced with many provitamins, of which most important is the beta carotene. A very rich source of these provitamins are leafy greens such as spinach or cabbage.
The recommended daily intake of vitamin A is 800 microgram, according to the standards of Czech republic. This need depends on the gender and age of each individual. The lack of vitamins A causes photophobia and impaired vision. The excess of vitamin A may be toxic for the organism. The interesting fact is that the beta carotene is not considered to be toxic.
Vitamin A is one of the labile vitamins. It is sensitive to heat, light and oxygen. At a gentle meal preparation and usual diet, the losses are around 20 %.
The vitamin D is consisted of group of several biologically active substances, of which the most important are vitamin D2, ergokalciferol, to be found in foods of plant origin, and vitamin D3, cholekalciferol, to be found in foods of animal origin.
In the human body, vitamin D acts as a hormone, it is formed at one point of the organism, but affects a different part of the body. The vitamin D ensures the intake and absorption of calcium and phosphorus and maintain their balance. It supports the immune system and may help in the psoriasis treatment.
The recommended daily intake of vitamin D is about 2,5 to 10 microgram. Pregnant and lactating women have a greater need for it, as well as infants and children. The lack of vitamin D disturbs the homeostasis of calcium and phosphate metabolism. The excess of vitamin D causes hypercalcaemia.
The most important foods source of vitamin D are liver, oil from fish liver, oil sea fish, fortified margarine and milk.
Vitamin D is sensitive to oxygen and light, its activity is not significantly affected by food storage or preparation.
Vitamin E is a major antioxidant. It is important to maintain the healthy cell wall and skin, muscles, nerves, erythrocytes, heart, and it is also responsible for the proper function of blood circulation.
The recommended daily intake of vitamin E is 8 to 20 mg. Its need is increased during exposure to sunlight and harmful influences, during increased physical exertion and when receiving large amounts of unsaturated fatty acids. The lack of vitamin E almost does not occur in healthy people, since it is present in nearly all basic kind of foods. The hypervitaminosis of vitamin E occurs only rarely, because there is no risk of overdose when receiving a normal diet.
The most important foods source of vitamin E are vegetal oils (such as sunflower and rapeseed), nuts, corn, pea, corn products, dark green leaf vegetables, eggs, liver and viscera.
Vitamin E is considered the most stable lipophilic vitamin. There is only a minimal loss of tocopherol during food processing, these losses are approximately 10 %.
The vitamin K supports blood clotting in the human body and, along with the vitamin D, is involved in the constant bone development and remodeling.
Both foods of plant and animal origin are sources of vitamin K, such as meat, liver, milk, vegetables and fruit. The recommended daily intake of vitamin K is around 0,01 to 0,14 mg. The infants and children up to three years have lower need of vitamin K intake. The most common cause of vitamin K hypovitaminosis is disruption of intestinal microflora caused by various drugs, e.g. antibiotics. Too high doses of vitamin K can accumulate in the body and lead to the breakdown of erythrocytes, damage the liver and cause jaundice in children.
There is not much information known about the stability of vitamin K yet. It has been found that vitamin K decomposes rapidly in the light, however its losses during food processing are minimal.
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Design of original piece of furniture for modern interior
Schořovská, Veronika ; Bomba, Jan (advisor) ; Podlena, Milan (referee)
This bachelor thesis is focused on issues of multifunctional furniture design which would be suitable for all apartments featuring a small surface area. The first chapter contains a partial overview of the historical progress in multifunctional furniture design, description of a variety of projects designed by worldwide known designers and a summary of trends in housing. The second chapter gives a detail description of the procedure of the furniture design. The third chapter is focused on my own multifunctional furniture design including a selection of suitable materials and its price calculation. In the attachments of this thesis there are sketches of the furniture in many different stages as the formation, constructional design and visualization.
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Landscape memory in the memory of its inhabitants - Hostavice district.
Tančevová, Laura ; Skaloš, Jan (advisor) ; Josef, Josef (referee)
This bachelor thesis attempts to create the most detailed summary of changes in the landscape for the past 175 years of Hostavice which is located in the eastern suburbs of Prague. The primary purpose of this study is to compare changes in terms of maps and from the perspective of original residentst, and provide an overview about the cadastral area from different perspectives. One of the ways to get to the main goal of this research work is to analyze the trends of most signficant changes in the land use of a small cadastral territory called Hostavice. This will be done primarily by reviewing historical maps, statistics, chronicles and others. Based on results of this analysis, another objective is to conduct semistructured interviews with the original residents of this cadastral territory to find out their recollections of as well as opinions on these changes. There is also more specific study of characteristic of the area. The work will contribute its share to the overall processing memory of the landscape in the memory of people.
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The Role of Agriculture in the Care of the Historical Mountain Meadows in Sklenářovice
Wolfová, Tereza ; Vaněk, Jindřich (advisor) ; Fedurcová, Alena (referee)
This Bachelor´s theses informs about the degradation of the highland meadows in the Krkonoše region. The process was closely connected with the ressetlement of the original Germans after the 2nd World War. After that nobody wanted to move to this region because of very hard living conditions and mountain landscape. That is why many villages (including Sklenářovice) declined and became desserted. The village of Sklenářovice has very rich history, for example gold mining, a typical activity for the whole Rýchory highland massif. Therefore this Bachelor´s theses icludes also the summary of the most important historical events of this small mountain village situated in the northtern part of Trutnov region. For gaining all the information I used scientific literature and other information resources.
The postwar transfer of the original German inhabitants influenced the life in the village and its surrouding landscape as well. It started to decline because of the lack of experienced farmers. Our forfathers made regular mow of meadows and bred the cattle in the pastures. Diversity of natural species was therefore very rich not only in the Sklenářovice valley but in the whole region. Unfortunately after the 2nd World War new comers didn´t know how care about the meadows properly. That is the reason why the meadows changed a became more and more overgrown. In the following years many things happened for example the establishing of forest brigades or state farming. All these things made the quality of meadows worse.
The situation got better in the 90´s of the 20th century. People realised the necessity of returning to original farming so that its natural and landscape values can be renewed. We can see the start of many programmes for renewal of the original Krkonoše landscape. Most of them are under the leadership of the Administration of Krkonoše Mountains National Park. This Bachelor´s theses suggests the effiecient ways of farming in the meadows so that its natural biological diversity can be preserved. It also informs about its protected biotopes.
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The beginning, evolution and breeding of Lipizzan horse in National Stud Farm Topoľčianky
Bedeová, Linda ; Navrátil, Jan (advisor) ; Marko, Marko (referee)
Bachelor thesis provides comprehensive information about the origin, development and Lipizzan horse breeding in the National Stud Farm Topoľčianky. The work consists of four parts. The first part informs about the National Stud Farm Topoľčianky itself, its location and surroundings. It describes formation of stud farm, its major milestones and formation of Lipizzan horse breeding in stud farm, which forms its integral part. The first part ends with description of current status of horses, while except for the number of horses and foals bred in the stud farm it includes characteristics of stallions for years 2015 and 2016. The second part informs about another stud farms that are breeding the Lipizzan horses in Europe, in particular the National Stud Farm in Lipica where the breed originated, the National Stud Farm in Piber and other stud farms in Central and Eastern Europe. The third section characterizes the Lipizzaner horse, describes the beginning of its breed in Slovakia and characterizes the breed through breeding standard, labelling of horses and their colouring. As next, a part of this chapter consists of a brief characterization and division of the stud book and there are also described various lines of stallions and mare families. The penultimate part of the third section of work is the provincial breeding and labour exploitation of the Lipizzan horses, in the Spanish riding school and tandem driving. The last part introduce the statistology of mare vital statistics aberrancy from the breed standard. For creating the summary sheet of that statistics, the stud books with bodily rates of 1921 to 2007 brood mares form the National Stud Farm Topoľčianky were used. The conclusion of this own research part is finding that the National stud farm, despite small variations still holds the breed standard, which confirms to us the correctness of line breeding, high breeding professionalism and especially conscientious work of all employees of the stud farm. The goal of the work was the approximation of the Lipizzan horse, his journey from place of origin to Slovakia and its settling down in the National Stud Farm Topoľčianky, as well as the work of stud farm in area of breeding, but also in sports, where riders achieve remarkable results both in tandem driving and the Spanish riding school.
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Selected Mechanical Wood Properties of Douglas Fir from Sites in the Czech Republic
Pilař, Ondřej ; Zeidler, Aleš (advisor) ; Holeček, Tomáš (referee)
Abstract
Introduced tree species are still undoubtedly, despite the current short-term politico-economic and environmental turbulences, an object of interest of the Czech forestry sector. Worldwide the most important tree species, and thus both in the areas
of its original extension and in the large regions where it was successfully introduced,
is the Douglas fir (Pseudotsuga menziesii), which is considered as one of the most perspective tree species. Information about the quality of its wood from our territory
is missing for the time being.
That´s why the aim of this work was to evaluate the quality of Douglas fir wood from different regions of the Czech Republic through selected mechanical properties. Especially the compressive strength, impact strength, flexural modulus and flexural strength were determined by standardized procedures. As well as, the variability
of the trunk features and that one of the locality were taken in consideration.
The final results of the mechanical features compared with the values measured on the wood from the original extension areas are better in compression strength, similar in flexural strength and slightly worse in the flexural modulus.
Comparing the resultant values of Douglas fir with the values of domestic spruce, the Douglas fir shows better values, apart from the values of flexural modulus, which are higher in case of the spruce.
A statistically significant difference between the location and the measured feature is demonstrated only in the elastic modulus and density. At the variability
in frame of the trunk there was found a statistically significant difference between
the vertical and horizontal position of the trunk and all the measured features. At the same time, the value of the measured feature increases together with increasing position from the pulp.
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