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Leaf physiological and optical properties in relation to the Phytophtora × alni infection of black alder (Alnus glutinosa)
Oramová, Viktorie ; Lhotáková, Zuzana (advisor) ; Tomášková, Ivana (referee)
A current problem is the infestation of the black alder (Alnus glutinosa) by the pathogen P. × alni, which causes the loss of alder stands and disrupts riparian ecosystems. The spread of the 'phytophthora disease' occurs through water, the host is infected through the root system and the pathogen attacks the conductive tissues. As a result of the disease, the tree gradually loses its root system, lesions appear on the trunk, defoliation occurs and the individual inevitably dies. The only solution to the situation is preventive measures to prevent further spread by careful removal of infected alder trees. The aim of this paper is to discuss the relationship between black alder and P. × alni in the context of the physiological changes that occur in the foliage of the infested individual. Leaf functional traits, chlorophyll fluorescence and optical properties of black alder exposed to P. × alni (inoculation into soil or confirmed occurrence of the pathogen in natural conditions) were measured using non-invasive methods. The results of the chamber experiments suggest that the mean values of the measured parameters do not change significantly in the initial stages of infection, but there is a widening of the variance of the values in infected individuals. We tested whether the genetic origin of the...
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Drought stress response of European beech seedlings monitored using physiological and optical indicators.
Červenka, Ondřej ; Lhotáková, Zuzana (advisor) ; Gebauer, Roman (referee)
One of the manifestations of global climate change is an increase in extreme temperatures and drought waves, while forecasts of future development indicate deepening negative impacts. The effect of these abiotic stress factors is reflected in the physiological state of the vegetation. It is therefore necessary to find suitable stress indicators that will help detect the worsening of physiological state of vegetation in time series. Indicators can be detected not only by physiological methods, but also optical ones, for further use of vegetation monitoring by remote sensing methods. Forest beech (Fagus sylvatica L.) is a native tree in our context, currently widely used in forestry for planting more species-varied communities of trees that are more resistant to the effects of climate change. The aim of the thesis was to study the responses of beech to drought stress using physiological and optical indicators. Beech seedlings (planting material from the nursery) were placed in containers in the experimental greenhouse for two experimental seasons, water supply was mediated by drip irrigation. The experimental material was divided into three groups with graded irrigation (control, moderate drought and drought). The watering regime consisted of three periods of drought and recovery phases with uniform,...
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Physiological status of young silver fir on stands with different microclimate using biochemical, and optical needle traits.
Kabilková, Eva ; Lhotáková, Zuzana (advisor) ; Pokorný, Radek (referee)
Silver fir (Abies alba Mill.) is a candidate tree species in the process of forest transformation especially of spruce monoculture stands (Picea Abies (L.) H. Karst.), thanks to its better growth characteristics in conditions of mild drought. However, fir, as a very shade tolerant tree, may be more susceptible to various abiotic stressors in more open forest canopies, and therefore it is necessary to study its ecological requirements in connection with the most effective possible application in forestry. In this thesis, the physiological state of young fir stands affected by different light microclimatic conditions, which were represented by different types of forest regeneration, was studied. Specifically, it is shelter-wood cut, which represents the likely highest degree of shading by mature trees, then natural regeneration under sparse canopy, gap cut and small clear cut, which represent a moderate degree of shading by mature trees, and last but not least, clear cut, which represents the lowest degree of shading. Physiological status was evaluated using biochemical and optical properties of the needles, and additional microclimatic conditions of the habitats, namely temperature and soil moisture, were also evaluated. Our results showed that the used biochemical and optical properties of the...
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Water in Public Space of Staré Brno
Šerek, Jiří ; Lhotáková, Zdenka (referee) ; Havliš, Karel (advisor)
The aim of the project is to restore water features in public spaces of the oldest city quarter Old Brno, and also to strengthen the genius loci of this characteristic district by mention of defunct Svratka raceway. The main theme of the work will be combination of water management, urbanism and architecture with a special attention on cultivation of public spaces by application of linear water features.
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The Significance and Function of Artificial Water Courses in the Present-Day Urban Environment
Ležatka, Lukáš ; Kyselka, Mojmír (referee) ; Ing.arch.Jaroslav Tušer,CSc. (referee) ; Löw, Jiří (referee) ; Lhotáková, Zdenka (advisor)
The objective of this dissertation is resolving the issues of both form and function of water courses in a present-day city. The dissertation focuses primarily on water courses which may be described as man-made, i.e. those resembling a canal, and addresses their prospective revitalization within the context of urban renewal and development in the present-day post-industrial era. The introduction includes a comprehensive analysis of the historical and typological development of artificial water courses, essential for grasping the connections as well as the current overall state of water courses in an urbanized setting. Detailed attention is devoted in particular to the most frequently occurring artificial water course - i.e. the race. The dissertation strives to defend the irreplaceable role of the water course as a public space in the urban landscape and - consequently - also its prospective essential revitalization. Examples, especially from throughout Western Europe, are used to demonstrate particular solutions, approaches and strategies to predominantly artificial water course renewal within the urban environment. The dissertation also devotes attention to the tools used in reaching relevant solutions.
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Water in an Urbanized Environment Svratka Raceway
Pavlovský, Tomáš ; Kyselka, Mojmír (referee) ; Löw, Jiří (referee) ; Sátora, Josef (referee) ; Lhotáková, Zdenka (advisor)
The dissertation describes the historic development of watercourses in Brno territory focusing on the artificial canal Svratka raceway and the present state is described based on the available map data, preserved picture materials and photographic documentation of the present state. The work offers memories of several people from Brno who remember the artificial watercourse, these complete the picture of the Svratka raceway at the time of its extinction. The dissertation documents the present state of areas where the raceway used to run and on which it bordered. What attitude the twin towns of Brno - Leipzig and Graz - take, is outlined in the chapter Examples of Raceway and Natural Stream Reconstruction in Here and Abroad. The presented work should serve as a comprehensive source material for further study of Svratka raceway and further possible studies of arrangement of the areas where the raceway used to run and its - at least - partial reconstruction.
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Response to abiotic stress in plants growing in green façades of temperate urban environment
Hrochová, Růžena ; Lhotáková, Zuzana (advisor) ; Havelková, Lenka (referee)
With increasing urbanization the temperature of cities is increasing and an effect of urban heat island arises. Vegetation, particularly vertical greenery systems: facades and walls, is mitigating urban heat island and reducing temperature. The aim of this work was to define these systems, their effects on the urban microclimate, to create an overview of the most used plants for greenery systems and to summarize their reactions to abiotic stresses of cities in a temperate region. Mediterranean studies were used in this work due to the scarcity of temperate climate research, which results could become valuable with climate change. Selecting proper vegetation can be done using habitat template, plants that are acclimated or adapted to the urban environment. Plants affect the urban microclimate through shading and transpirational cooling, which ideally contribute to reducing the heat island effect with optimal irrigation. Stressors followed in this work were drought, high temperature and irradiance, air pollution and salinity. To all these stressors plants reacted with limiting physiological functions and reducing growth. The common reaction was a decrease photosynthesis rate and chlorophyll content. Ractions of plants of vertical greenery systems to different stressors and their combinations are...
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Thermal imaging as a tool for evaluation of plant's cooling effect in green façades
Nohová, Michaela ; Lhotáková, Zuzana (advisor) ; Schwarzerová, Kateřina (referee)
Urbanisation and global warming are gaining momentum, and with it the need to improve the thermal comfort of urban citizens is growing. Due to the geometry of the city and the thermal properties of the materials from which the city consists, the so-called urban heat island effect occurs, which causes the temperature in city centres to be higher than in rural areas. One possible way to mitigate the urban heat island effect is to incorporate vegetation into the urban infrastructure. Green architecture is designed to do just that, and in this thesis I specifically focus on green facades and their cooling effect. Since green facades are usually large areas of green surface, this thesis focuses on thermal imaging and its use to measure the cooling rate of buildings and ambient air by green facades. It is the use of thermal cameras that is characterized by the ability to image large areas and record their temperature in real time, making thermal cameras an ideal tool for green facade research. As this topic is very specific and not yet so widespread in the literature, I discuss thermography from several perspectives in the context of its use for research on plant physiological parameters, and I also discuss the various methods and pitfalls of working with thermal image data. Key words: abiotic stress,...
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Autumn leaf senescence in temperate and boreal woody species under changing climate
Kosová, Barbora ; Lhotáková, Zuzana (advisor) ; Konrádová, Hana (referee)
Autumn senescence of the foliage of deciduous trees of temperate and boreal zones is an annually recurring phenological phenomenon, which is part of the adaptation to life in the temperate and boreal zones with periods of frost and restriction of solar radiation. During foliar senescence, photosynthetic pigments decompose, mineral nutrients are remobilized and foliage falls off. The timing of foliage senescence in boreal and temperate deciduous trees is controlled by external and internal factors. The biggest role in the timing of senescence is played by photoperiod and temperature, which gradually decrease by he end of the growing season. The temperature is increasing due to global warming, thus affecting the length of the growing season and the sequestration of carbon into forest stands. Other factors (such as water availability) are also affected by climate change. The above-mentioned factors affect the trees of boreal and temperate forests to varying degrees, and it is, therefore, important to address them in order to be able to estimate the future development of foliage senescence and carbon sequestration in temperate and boreal forests.
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