National Repository of Grey Literature 98 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Reakce sazenic vybraných druhů dřevin na zaplavení
Ryšavý, Jan
The thesis investigates the response to flooding of five species types of trees occurring in floodplain forests of South Moravia. This work aimed to evauate different lengths of the seedling flooding and examined seedling vitality and mortality. The investigated tree species were summer oak (Quercus robur L.), hornbeam elm (Ulmus minor Mill.), heart linden (Tilia cordata Mill.), hornbeam (Carpinus betulus L.) and field maple (Acer campestre L.). The flooding experiment was conducted from April to July 2022 and at different time intervals (7-14 days) the seedlings were flooded up to the root collar. Control seedlings were not flooded but only watered. 140 seedlings of each species were flooded and were gradually removed from the flood. The results show that relatively low mortality was observed for the flooded trees in all intervals. It was lowest for Quercus robur and Tilia cordata, which were characterized by high vitality in addition to low mortality. Ulmus minor was characterized by moderately vital seedlings. Acer campestre and Carpinus betulus had the highest mortality and their vitality decreased significantly towards the end of the experiment. The hypothesis of Quercus robur's resistance to flooding has been confirmed, which means the seedlings of this tree can probably cope well with flooding even in the conditions of floodplain forests. Tilia cordata also coped very well with flooding. It has probably invested in trunk thickness in response to water stress, adapted to flooding and thus gained a competitive advantage over other tree species. The thesis confirmed the assumption that Quercus robur is a resilient tree species to flooding and Tilia cordata showed higher resilience than expected.
Otestování vlivu termínu aplikace růstových stimulátorů na efektivitu obrany dřevin vůči hemiparazitické rostlině jmelí bílé Viscum album L.
Javorský, David
This thesis focuses on finding the appropriate timing for the use of chemical defences to eradicate white mistletoe (Viscum album L.) using growth regulators designed for plant protection. The thesis is divided into two main parts, namely, the literature review related to the problem addressed and the practical implementation of the research. In the research, two growth regulators were applied in a regular interval of fourteen days between November and March. The results of this work, the showed effectiveness of the application of growth regulators used for mistletoe eradication in February. The efficacy of the two chemical agents used is different 73 % and 92 % over the entire period under study.
Hodnocení přirozeného zmlazení ve vybraných maloplošných chráněných územích Školního lesního podniku "Masarykův les" Křtiny
Mareš, Viktor
The objective of this work is to evaluate natural regeneration in two reserves and one management stand in school forest company Křtiny. Two field surveys were carried out, one before the growing season and second after the growing season. The work focused on sessile oak (Quercus petraea), which forms the upper storey at all sites, and it is commercial and natural species to these areas. The success and effect of habitat on regeneration was investigated. The surveys were conducted and based on the fact that 2020 was a strong seed year for sessile oak. Seedlings were evaluated in a network of plots for each site to determine the status of regeneration, and what influences it if any and also the condition of the shelterwood. In the NPR Hádecká planinka, a very poor state of natural regeneration was found, which is probably due to lack of light and competition from other tree species. In contrast, the condition at the U Vojáků site in the clearing area segment clearly shows that oak regeneration is much better in open areas with sufficient light.
Mortalita podsadeb buku lesního a jedle bělokoré vyzvednutých z přirozené obnovy
Gattnar, Matyáš
The main aim of this bachelor thesis was to evaluate the mortality of seedlings of white fir (from three different natural forest areas) and beech, which were collected and transplanted under spruce forest. The research was carried out in the Moravian-Silesian Beskydy Mountains in the Kyčera area, which is under the administration of the Forestry Service of the Czech Republic. Two decaying spruce monocultures were used. Several variants of forest beech and white fir from three different natural forest areas (Beskydy, Jeseník, Žďár) were planted on the nutrient habitats. The best results were obtained for the variant of rooted beech, which was planted in the spring of 2022. Of the fir trees, those taken from the Beskydy area fared best.
Zhodnocení zdravotního stavu a perspektivy výsadeb dřevin rostoucích u silnic II. a III. třídy, v okresech Hodonín a Břeclav
Prášek, Petr
Abstract The aim of the bachelor thesis was to evaluate the perspective of plantings along roads in order to find the cause of reducing the perspective of newly planted road alleys. Three sites with different conditions with different taxa were selected for the research. The dependence of perspective on the given conditions was investigated. Furthermore, the subsequent treatment of plantings was proposed to positively influence the perspective on the basis of the amended Tree Evaluation Standard. The results of the research showed that the prospect of new planting is poor. The reasons for the reduced perspective were determined as the absence of post-planting care, mechanical damage to the machine trunks and loss of planting due to theft. Another investigation of this survey was the financial demands of new plantings. Based on the findings of a reduced perspective, it was possible to determine the financial costs of green maintenance beyond standard care.
Species-specific and individual predictors of birds' collisions with glass obstacles in the Czech Republic
Semeráková, Anna ; Sedláček, Ondřej (advisor) ; Viktora, Lukáš (referee)
Recent landscape transformation is associated with the emergence of various artificial obstacles that change the natural form of habitats and biocorridors of free-ranging animals. Glass obstacles represent a particular problem due to their transparency and reflectivity. Collisions with glass represent one of the most significant causes of bird mortality worldwide, accounting for over hundreds of millions bird deaths annually. Many authors consider this source of mortality to be completely non-selective. In that case, total collisions mortality would represent a function of population size. However, here I assume that the relationship between collision mortality and population size is more complex and that certain avian ecological groups may be differently susceptible to glass collisions based on their specific ecological characteristics. Long-term records of bird-glass collisions in the Czech Republic were provided by the Czech faunistic databases. These records were compared with the population size of analysed species and with selected ecological and morphological species characteristics. Consistently with the premise, I found out that the greatest amount of collision mortality is explained by the species' population size. However, other species characteristics, such as higher body weight,...
Prognosis in Ischemic Stroke Patients and Related Prognostic Faktors
Kielbergerová, Lenka ; Rohan, Vladimír (advisor) ; Holečková, Irena (referee) ; Petrák, Ondřej (referee)
Stroke is a significant cause of morbidity and mortality in the developed world. In the theoretical part of the thesis, we try to summarize the overall knowledge of stroke, the definitions and the general approach to the diagnosis and treatment, with a focus on ischemic stroke. Furthermore, the issue of acute phase treatment and secondary preventive treatment of ischemic stroke is reviewed and the modalities of the subsequent neurological deficit evaluation, the occurrence of mood disorders and the assessment of the quality of life of individuals after stroke are discussed. Our research aimed to assess the perspective of ischemic stroke patients admitted to the hospital. The first part is focusing on the mortality of patients with ischemic stroke in the period 2003-2019 in the Westbohemian region and its relation to secondary prevention. The second part aims to identify the main clinical and psychosocial factors affecting the quality of life of chronic stable post-stroke patients after their first in-life episode of stroke. The relation of poor quality of life indicators, mortality and conventional cardiovascular risk factors is prospectively assessed. The mortality of patients after first-in-life ischemic stroke hospitalization the years 2003- 2019 is higher compared to worldwide trends. In the...
Long-eared owl (Asio otus) migration within Central Europe
Fraitágová, Iveta ; Řezníček, Jan (advisor) ; Klvaňa, Petr (referee)
The aim of the present thesis is to give a review of the ringing recoveries of the Long - eared owl (Asio otus) in the territory of the former Czechoslovakia and the Czech Republic. The bird ringing data used in this thesis come from the archive of the National Museum in Prague. The parts of the thesis are as follows:1) history of the ringing in the Czech Republic; 2) bird adaptation on the flight and migration; 3) control of the migration; 4) the data of the Long- eared owls ringed as the young birds in the nest (pulli); 5) the data of the Long - eared owls ringed as adults (ad), that were caught and checked during their wintering in the Czech Republic; 6) the recoveries of the Long- eared owls ringed by various European Bird Ringing Centres and found in the Czech Republic; 7) cause of the mortality of the Long eared owl;8) census of the Long - eared owl recoveries in the Czech Republic from 1934 till 2011 (appendix). Key words: Migration, the Long-eared Owl, Ringing, Ringing Recoveries, Mortality
Bird mortality at transparent barriers
Houdová, Monika ; Reif, Jiří (advisor) ; Koleček, Jaroslav (referee)
Bird mortality at transparent barriers (noise barriers or common house windows) is undoubtedly very important environmental issue, because of the rapid development of human society and even more rapid growth of very dangerous places for birds. At this time there is no review article yet, that would synthesize each sub-study on the extent to which individuals can die on those obstacles, which factors are critical for the ability of obstacle avoiding, how much collision threaten the vitality of bird populations and if we can prevent such unintended damage. This bachelor thesis handle with these questions as a literary review. From the available information we can suggests that the most important factor is migration behavior of birds, individuals migrating through the night are much more at risk than those migrating during the day, mostly because of light pollution, which can confuse them. The most dangerous time of year in this direction is clearly autumn, and that also relates with migration. Population losses caused by collision to the transparent barriers can be up to 20 % of the total population per year. Thesis in addition to a summary of available information on the issue proposes and evaluates possible preventive aplications, which may further serve to effective conservation for birds among...

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