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Multiproxy evidence of Late Pleistocene environmental changes in the loess/paleosol sequence of Bůhzdař
Flašarová, Kristýna
Loess-paleosol sequences preserve information that can be used to reconstruct paleoenvironement, specifically the climatic conditions and the vegetation present at the time of their formation. A dense network of reliably analyzed sequences from different geographic locations is crucial for representation of ecological and climatic trends during the Pleistocene (Frechen, 2011). The aim of this thesis is to fill the gap in the geographical distribution of well described loess-paleosol sequences in Central Europe. Therefore, it focuses on a loess- paleosol sequence in Bůhzdař, situated 9 km NW of Prague, Czech Republic. This profile was last studied in 1952 by naturalist Vojen Ložek. This thesis uses a number of analyses in order to get a multi-proxy record of local paleoenvironmental changes archived in a sequence of alternating loess sediments and paleosols in Bůhzdař. Geochemical approaches are combined with grain size distribution to define climatic conditions at the time of formation of the strata. Key words: loess/paleosol sequences, Bůhzdař, Czech Republic, particle size distribution, total organic carbon, XRF, XRD, stable isotopes 13 C and 18 O
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The spread of invasive neophytes in the riparian vegetation of the Úpa River
Tomeš, Miroslav ; Matějček, Tomáš (advisor) ; Flašarová, Kristýna (referee)
The presented bachelor thesis deals with the distribution of invasive neophytes in the riparian vegetation of the East Bohemian river Úpa and compares the findings with other streams. In the practical part, in the summer of 2020, the occurrence and abundance of 17 selected taxa of invasive neophytes in segments with a length of 500 m are monitored, for statistical evaluation merged into sections 2-3.5 km long. In almost 60 km of vegetation (in the sum of both banks) there are 7 taxa of invasive neophytes with different degrees of representation. Unequivocally dominant is in terms of the absolute number and share of occupied segments the taxon Impatiens parviflora occurring in almost the entire mapped area. Reynoutria sp., I. glandulifera and Solidago sp., which are concentrated in certain localities, can also be mentioned as numerous taxa. All segments are invaded. A more significant invasion process is taking place on the right bank of the river. In the Czech context, Úpa is one of the more invasively loaded streams. Keywords: invasive neophyte, riparian vegetation, the Úpa River, stream, monitoring of vegetation
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Multiproxy evidence of Late Pleistocene environmental changes in the loess/paleosol sequence of Bůhzdař
Flašarová, Kristýna
Loess-paleosol sequences preserve information that can be used to reconstruct paleoenvironement, specifically the climatic conditions and the vegetation present at the time of their formation. A dense network of reliably analyzed sequences from different geographic locations is crucial for representation of ecological and climatic trends during the Pleistocene (Frechen, 2011). The aim of this thesis is to fill the gap in the geographical distribution of well described loess-paleosol sequences in Central Europe. Therefore, it focuses on a loess- paleosol sequence in Bůhzdař, situated 9 km NW of Prague, Czech Republic. This profile was last studied in 1952 by naturalist Vojen Ložek. This thesis uses a number of analyses in order to get a multi-proxy record of local paleoenvironmental changes archived in a sequence of alternating loess sediments and paleosols in Bůhzdař. Geochemical approaches are combined with grain size distribution to define climatic conditions at the time of formation of the strata. Key words: loess/paleosol sequences, Bůhzdař, Czech Republic, particle size distribution, total organic carbon, XRF, XRD, stable isotopes 13 C and 18 O
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Remote sensing in the secondary school education
Flašarová, Kristýna ; Štych, Přemysl (advisor) ; Král, Luboš (referee)
Remote sensing is a tool that allows us to study Earth's surface using sattelite and aerial imagery. Using this technology, it is possible to obtain data regarding objects as well as processes on Earth and in its atmosphere without being in physical contact with the studied objects. This ability to detect and study objects and processes remotely presents a significant advantage over other methods. The importance of remote sensing has gained considerable recognition in recent years and remote sensing was supposed to be introduced into the curricula of grammar school (gymnázium) and Geodesy and cadaster (Geodézie a katastr nemovitostí) high school programs in 2009. Despite this, approximately half of graduates of these programes between 2010 and 2019 reported not encountering remote sensig in high school. This thesis studies the current state of remote senisng instruction in high schools and tests the Sentinel Hub software in the form of practical assignments accompanied by a detailed manual. This free software has the potential to aid the implementation of remote sensing in education and an overall wider use of this technology as it is applicable in a wide range of disciplines.
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Pedogenic carbonates of loess-paleosol sequences
Máslo, Jaroslav ; Flašarová, Kristýna (advisor) ; Šefrna, Luděk (referee)
Loess is sediment composed predominantly os silt-size particles. Silt-size particles are transoported mainly by wind. Loess covers 10 % of earth surface. If the loess can be layed for a longer time when the glacials and interglacials alternate, the loess-paleosol sequences are created. Common part of loess and loess-paleosol sequences are pedogenic carbonates, which are particles of CaCO3. There are many types of carbonates, e.g. Calcified root cells. hypocoatings, needle-fiber calcite… Loess-paleosol sequences and carbonates in them are realy useful source of information about paleoenvirnonment. In practicle part of this work the isotopic composition of C and O in pedogenic carbonates from loess-paleosol sequence in Dejvice (Prague) was measured.
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Multiproxy evidence of Late Pleistocene environmental changes in the loess/paleosol sequence of Bůhzdař
Flašarová, Kristýna ; Strouhalová, Barbora (advisor) ; Trubač, Jakub (referee)
Loess-paleosol sequences preserve information that can be used to reconstruct paleoenvironement, specifically the climatic conditions and the vegetation present at the time of their formation. A dense network of reliably analyzed sequences from different geographic locations is crucial for representation of ecological and climatic trends during the Pleistocene (Frechen, 2011). The aim of this thesis is to fill the gap in the geographical distribution of well described loess-paleosol sequences in Central Europe. Therefore, it focuses on a loess- paleosol sequence in Bůhzdař, situated 9 km NW of Prague, Czech Republic. This profile was last studied in 1952 by naturalist Vojen Ložek. This thesis uses a number of analyses in order to get a multi-proxy record of local paleoenvironmental changes archived in a sequence of alternating loess sediments and paleosols in Bůhzdař. Geochemical approaches are combined with grain size distribution to define climatic conditions at the time of formation of the strata. Key words: loess/paleosol sequences, Bůhzdař, Czech Republic, particle size distribution, total organic carbon, XRF, XRD, stable isotopes 13 C and 18 O
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Carbon sequestration and carbon stock in forest soils
Flašarová, Kristýna ; Chuman, Tomáš (advisor) ; Strouhalová, Barbora (referee)
Carbon sequestration is one of the most important processes in the soil. There is three times more carbon in soil than in the atmosphere, significant part of this soil carbon is deposited in the forest soils of North America, Europe and Asia. Soil, compared with biomass, is able to store carbon for a long time and protect it from decomposition and release back to the air. Carbon sequestration and its stock in soil are influenced by many factors (climate, bedrock, biological activity, relief and land use). Forest soils contain large amount of carbon and with adequate management and tree species composition is possible to increase final amount of soil carbon. This thesis is about, besides other things, measuring soil carbon in different depths and comparing the final results in total amount of carbon in soil. Practical part compare amount of carbon in forest soils of two main tree species in Czech mountain forests: beech and spruce, where the largest amount of soil carbon is stored in the Czech Republic.
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