National Repository of Grey Literature 12 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Correlation analysis among the distribution of forest vegetation zones, selected climatological parameters and actual vegetation status in Hostýn-Vsetín Mountains subregion of natural forest region 41
Pšenko, Martin ; Černý, Tomáš (advisor) ; Ulbrichová, Iva (referee)
Hostýnské mountains are part of the most frequently visited forests in Moravia. Whether because of the numerous cottage and recreational areas with abundant occurrence of fungi, these forests were subject to great anthropogenic influence since its origin. Therefore, it was created on the territory of several protected areas and nature reserves, which were designed to preserve the natural vegetation potential of local vegetation and protection of rare species of local phytomass and zoomass. The goal of this thesis is the verification of the respective forest vegetation zones of the investigated plots, which had been historically assigned in several respects. In the past, namely the allocation of forest vegetation zone was entirely an empirical matter, which scientists have not been able to verify the correctness of his judgment by means of statistical analysis, as is the case nowadays. The plots were therefore selected to characterize best the local conditions, whether in terms of species composition of vegetation or climatic conditions. On the 20 selected plots there were collected data within individual tree layers (based on Kraft-Zlatník scale), species composition and level of development of individual trees by circuits measured at breast height and height measurements according to average individuals. As additional data for the overall evaluation were used climatological maps using GIS software creating a mosaics from which it can be acknowledged how much of the forest stands is affected by abiotic factors such as the length of the snow or the average air temperature. The data assembling the complete image of the plot characteristics were subsequently analysed by regression and multivariete statistical analysis. The obtained results show the context between the actual stage of the forest stands and the used climatic parameters. I believe that this work could be a model for those who do not rely on empiricallly-derived forestry maps and admit that the overall climate in our country is changing and evolving. It is therefore important to consider these causes not only for the purposes of forest management, but also for the protection of existing vegetation.
Floristic survey of the surroundings of the abandoned village Malonin (Prachatice region)
Kadlec, Jakub ; Karlík, Petr (advisor) ; Ulbrichová, Iva (referee)
Abandoned villages and belonging landscape structures are significant due to high biodiversity. The former village Malonín in the Prachatice region is an example of medieval settlement with well-preserved landscape structures, therefore multidisciplinary research is focused on understanding the origin and development of its specific long-strip field patterns. As a part of this research, floristic survey was being carried out during the period 11. 4. 2015 to 14. 9. 2015 in the 5,25 km2 defined study area. The survey was aimed at plant indicator species, vulnerable and endangered species or rarities concerning the phytogeographical aspect. Within 7 visits, 70 findings of 18 plant species were recorded. Every finding was mapped using the ArcGIS software and described including ecological requirements, former land-use categories and forest typology. As well, the findings were interpreted if possible. Additionally, distance between each finding and the abandoned village, the nearest existing village and the nearest stream was measured and the results were displayed using box plots. Relation between these distances and Ellenberg indicator values was tested statistically. Certain species indicate former settlement (Vinca minor, Syringa vulgaris), some species take the advantage of specific man-made biotopes e.g. Corydalis cava. The majority of recorded species is listed in the Red List of vascular plants of the Czech Republic. The results confirm the uniqueness of abandoned settlements and the worthiness of studying and preserving its heritage.
Environmental control over growth of coniferous trees with attention to Norway spruce
Kníř, Tomáš ; Čada, Vojtěch (advisor) ; Ulbrichová, Iva (referee)
Norway spruce belongs to the pine family. It has conical shape of the crown and straight trunk, the height ranges from 20 to 35 meters. Its natural habitat in the Czech Republic is in high elevations. The optimal temperature is 6 °C and the rainfall in the vegetation period is 490 580 mm. The thesis also contains data about growth and the requirements for influential processes and regulators. I also review the formation of the growth rings - i.e. growth ring definition, formation and internal and external influences. The thesis also focuses on dendrochronology. This science is a basis for obtaining information from dated growth rings. Using dendrochronology we can determin the annual diameter increment and the age of the tree. This science is divided into several different subdisciplines according to the usage of the growth rings data such as dendroclimatology, dendroecology, dendrogeomorphology, dendrohydrology and dendroarcheology. The selection of the area where samples are collected for the data analysis is the key factor. The environment influences the growth of the trees both in the positive and the negative way. The climate is one of the most important factors that influence the growth. Climatic influences are mainly rainfall and air temperature where the influence differs between low and high altitudes. Anthropogenic influences, mainly air pollution (ozone, carbon dioxide, nitrogen, sulfur dioxide), play important part for the tree growth as well. From the gained knowledge is clear that Norway spruce should be in the future planted in higher altitudes where in case of global warming better conditions are for the tree.
Overstory-understory neighborhood effect in mountain mixed forest
Matouš, Marek ; Bače, Radek (advisor) ; Ulbrichová, Iva (referee)
The object of this study is to describe overstory-understory neighbourhood effects in natural mountain mixed forests in environmental conditions of central Europe. Namely, the neighbourhood effect of European beech (Fagus sylvatica L.), silver fir (Abies alba Mill.) and Norway spruce (Picea abies [L.] Karst. ). The sample plots are situated in central Slovakia. On 60 plots, counts of individuals of these species were recorded and divided by social status (from 6 cm of DBH). Regeneration of these species, was divided into 4 high categories. For 30 trees of each species, regeneration was also counted under specific crown in the area of 4 m2. The data was evaluated mainly by the generalized linear model in R statistical program. Here was evaluated the relationship between individuals of different categories of understory and overstory and the dependence between counts of regeneration of each species under specific crown. The strongest positive overstory-understory neighbourhood effect, was observed for the silver fir in all categories of regeneration (p<0.001). It also weakly negatively affected the regeneration of beech. For spruce, the positive neighbourhood effect was demonstrated only among the trees of upper level and saplings from 0.5 to 1.3 meters. Other categories of spruce saplings, were in too small quantities for demonstrating these relationships. Positive overstory-understory neighbourhood effect of beech was weak, or neutral for advanced regeneration. But seedlings to 0,5 m height, were in minimum quantity under spruce and fir crown. Beech also significantly negatively influenced all regeneration categories of silver fir (p<0.001). So, for each species, the overstory-understory neighbourhood effect is more or less positive, at least for lower height regeneration categories. This effect suggest also to small scale species stability of these forests.
Climatic factors influence to the broadleaves growth in temperate forests
Nedbal, Tomáš ; Ulbrichová, Iva (advisor) ; Janeček, Vladimír (referee)
The research summarizes knowledge about the influence of climatic factors on radial growth of broadleaves in temperate zone in Europe. The research follow up with effect of climatic change to distribution of broadleaves species especially beech (Fagus sylvatica) and oaks (Quercus petraea, Q. robur).
Canopy effect on the Scotch pine regeneration in understory
Kostohryzová, Aneta ; Ulbrichová, Iva (advisor) ; Bílek, Lukáš (referee)
The Pinus sylvestris natural regeneration growth and site characteristics effect were evaluated in the area of VLS ČR, s. p. divize Mimoň-Doksy in september of 2015. The dendrometric parameters of seedlings as listed: the total height, the diameter, the last 5 years height increment, the crown diameter, the quality and vitality of plants and the branch angle) were measured at nine plots. Also microsite characteristics, such as: herbal layer composition, light conditions, litter horizons and distance to the nearest adult tree) were noted at these sites. The 416 seedlings were measured in total. The main site characteristic with significant effect on the mean increment was direct photosynthetical radiation (r = 0,47). Other significat factors were the total and the diffuse photosynthetical radiation, the canopy and the amount of small bushes in herbal layer. There can be also concluded that good light conditions have statistically significant effect on the quality of seedlings. Influence of other site characteristics was not statistically significant.
Environmental factors effect to the Scotch pine seedlings survival
Pourová, Marie ; Ulbrichová, Iva (advisor) ; Janeček, Vladimír (referee)
The survival and mortality of the Scots Pine (Pinus sylvestris) seedlings during the vegetation season of 2015 are evaluated in the thesis. The seedlings in greenhouse conditions in Truby were exposed to water deficiency, three variants of shading and simultaneously to environmental temperature, which, due to weather, was extraordinary high at the time of the experiment. The highest number of grown seedlings from the seed material from Plasy was 89 % from the total of 224 outplanted ones, namely in conditions of mean shading and slightly reduced watering. The highest mortality of the seedlings was found in unshaded environment with slightly reduced watering, in mean shading with the second lowest watering and in the highest shading with the second lowest watering, the mortality was 100 % there. The seedlings from the seed material from Doksy were much more hard put to it. The seedlings grew only in four cases in unshaded environment with the highest watering (4 % from 224 outplanted ones), in mean shading with the highest watering (38 %) and in the environment with the highest shading together with the highest watering (68 %) and slightly lowered watering (1,3 %). In all cases the seedlings mortality was higher than 70 %. The lowest number of grown seedlings occurred in unshaded environment and between the variants with mean and high shading, there was only a small difference. The results were strongly affected by extraordinary warm vegetation season.
Characterization of soil units within the forest site complexes in ČLA Trutnov
Kejklíčková, Iva ; Penížek, Vít (advisor) ; Ulbrichová, Iva (referee)
The objective of this master thesis is the evaluation of the most frequent forest soil types in forest district of the Czech Forestry Academy (ČLA) Trutnov. The ČLA forest district covers area 670,41 ha. Soil survey and phytocenose analysis was performed on eight most frequent forest site complexes (FSCs) within the district. This work is focused on the phytocenose analysis in the particular FSCs, soil types determination physical and chemical soil properties on the particular FSCs. Additionlly conditions and possible differencies between coniferous and deciduous stands were investigated on three forest site complexes. According to the results of measurement when evaluating the relationship between the forest and soil type it shows that in given natural conditions of the forest district of the Czech Forestry Academy Trutnov there are FSCs corresponding with the given conditions on the forest grounds. Particular FSCs occur in the direct dependence on natural conditions and their soil profiles correspond with pedogenesis on the particular sites. The hypothesis was confirmed, that a long term vegetation influence characterized by FSCs has substantially influence over soil environment and the other way round. The interaction between the phytocenose and soil environment was found on all monitored sites. Different fytocenosis composition of broadleve and coniferours forest stands influences the chemical and physical properties, humus forms and some of the morphological properties of soil profiles with different intensity in all three detailly studied FSCs. However, this influence was less considerable, when compared with assumptions.
Forestry potential of Carpathian birch on extreme mountain sites
Skibková, Lucie ; Kuneš, Ivan (advisor) ; Ulbrichová, Iva (referee)
After a pollution calamity with its peak in the 70s-80s the Jizerské Mountains were quite fast reforested. The new generation of stands with spruce as a dominant species needs a differentiation of the species, age and structure. Not just the climatic conditions but also the predation pressure of hoofed game and rodents causes big difficulties to the possibility of enrichment of other tree species on some places. One of potentially suitable tree species in the acid and exposed mountain sites is Carpathian birch (Betula carpatica). This species is so far not well researched. The main aim of this thesis is to evaluate the prosperity of experimental planting of Carpathian birch. This planting was established in 2008 close to the hamlet Jizera in the locality of Panelová cesta. Other aims of this thesis are to follow up on former measurements on the research plot, to carry out another series of biometric investigation, to set the mortality, height and height increment and according to this research to evaluate the forestry potential of Carpathian birch on extreme mountain sites.
Formulace zásad lesnického hospodaření a péče o půdu s ohledem na dlouhodobou acidifikaci‚ nutriční degradaci a eutrofizaci lesních půd
Česká zemědělská univerzita v Praze, Fakulta lesnická a environmentální, Praha ; Ústav systémové biologie a ekologie AV ČR, České Budějovice ; Ústav pro výzkum lesních ekosystémů, s.r.o., Jílové u Prahy ; Cudlín, Pavel ; Kunš, Ivan ; Ulbrichová, Iva ; Podrázský, Vilém
Příloha 4.3: Česká zemědělská univerzita obsahuje dodatek k výroční zprávě projektu sumarizuje podklady pro finální výstup, jímž bude soubor konkrétních opatření a prostorová doporučení pro aplikaci postupů chemické a biologické meliorace půd (stanovišť) v Jizerských horách. Zabývá se shrnutím diagnostických metod pro zjišťování potřeby meliorace, cílovými parametry lesních půd revitalizovaných stanovišť, optimalizovanými postupy chemické meliorace, využitím ekologických sukcesních procesů v revitalizaci stanovišť. Obsahuje shrnuté syntetické výstupy a výsledky konkrétních výzkumných projektů a praktická doporučení a zásady. Příloha 4.4: Ústav ekologie krajiny AV ČR obsahuje dílčí projekt Retrospektivní sledování defoliačních a regeneračních procesů asimilačních orgánů smrku ztepilého.

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