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Vyhodnocení fenologických fází dospělého bukového porostu na Ekosystémové stanici Štítná nad Vláří
Střecha, Jaroslav
At the Štítná nad Vláří Ecosystem station in the White Carpathians, phenology cameras have been taking pictures inside an adult beech forest from a meteorological mast, together with the collection of meteorological data since 1960. Phenology records regularly recurring changes in plants, the so-called phenophases, in relation to the external environment and especially the weather. Therefore, forest ecosystems function as an important bioindicator of climate change. From the phenologial observation in 2018–2020, beech phenophases were evaluated in two ways. Visual evaluation and analysis of the vegetation index from the phenology camera image. Image analyses record the phenological stage earlier than the observer. There was an increase in the average annual temperature, resulting in a longer growing season. The growing season was extended by up to 82 days. This trend of climate change, together with the occurrence of years with a lack of precipitation, will have a negative effect on the vitality of beech and forest ecosystems.
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Changes of length of periods with characteristic temperatures
Holtanová, Eva
Title: Changes of lengths of periods with characteristic air temperatures Author: Eva Černochová Department: Department of Meteorology and Environment Protection Supervisor: doc. RNDr. Jaroslava Kalvová, CSc. Supervisor's e-mail address: jaroslava.kalvova@mff.cuni.cz Abstract: Lengths of periods with characteristic air temperatures were derived using two different methods (linear interpolation, robust locally weighted regression) for 10 stations in the Czech Republic and for output data of regional climate models HIRHAM and RCAO in 4 grid points. Averages for a forty-year period (1961-2000) and for a thirty-year period (1961-1990) were computed as well as averages for every decade. Considerable attention was also paid to the analysis of methods used in the research. Most stations showed lengthening of growing season and summer during the twentieth century. Decennary average length of growing season and summer shortened in the years 1971-1980. The comparison of output data of regional climate models HIRHAM and RCAO and measured station data showed that the thirty-year average lengths of growing season and summer estimated by the two models were reasonably accurate approximately half of all cases. The models' estimates were not accurate at all concerning decennary averages. Keywords: robust locally...
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Posouzení trendů aktivních a efektivních teplot v období 1961-2010
Kourek, Zdeněk
The work analyzes the meteorological element air temperature at three climatological stations. The aim was to assess changes in the values of temperature sum, and the sum of active temperatures (sum of temperatures over specified threshold) and the sum of effective temperatures (sum of temperatures over specified threshold - defined threshold) for the period 1961 - 2010. At the same time large vegetation season (number of days when the average daily temperature is consistently above 5 ° C), the main (number of days when the average daily temperature is consistently above 10 ° C the growing season) and the growing years (number of days when the average daily temperature is consistently above 15 ° C) was analyzed. These results were then compared with the proxy data from the field of plant and animal phenology. Pedunculate oak or English oak (Quercus robur) was chosen as a representative for the higher plants and the Great tit (Parus major) was chosen for the represenatives of the bird species in the Lednice area. On the basis of calculating the sum of active and effective sum, we can say that their values increase with time, as far as the number of days in the growing seasons. The results are regionally different.
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Fenologická pozorování ve smrkovém porostu na ekosystémové stanici Rájec, Drahanská vrchovina
Mizerová, Lucie
This diploma thesis evaluates the commencement of phenophases considering the changing microclimate conditions in the habitat of Norway spruce (Picea abies /L./ Karst) in a young and a mature spruce monoculture at the ecosystem station Rájec. The phenology of spruce undergrowth has also been under observation. Regarding the methods, above-ground phenology and observation by means of phenocams have been used. The results have been compared not only among themselves but also in the context of long-term averages. Thanks to the fact that phenophases of forest woody plants and herbaceous plants are dependent on climate conditions, the results of long-term phenological observations are a conclusive indicator of climate changes. The results of this diploma thesis can be a contribution to the phenology database.
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Changes of length of periods with characteristic temperatures
Holtanová, Eva
Title: Changes of lengths of periods with characteristic air temperatures Author: Eva Černochová Department: Department of Meteorology and Environment Protection Supervisor: doc. RNDr. Jaroslava Kalvová, CSc. Supervisor's e-mail address: jaroslava.kalvova@mff.cuni.cz Abstract: Lengths of periods with characteristic air temperatures were derived using two different methods (linear interpolation, robust locally weighted regression) for 10 stations in the Czech Republic and for output data of regional climate models HIRHAM and RCAO in 4 grid points. Averages for a forty-year period (1961-2000) and for a thirty-year period (1961-1990) were computed as well as averages for every decade. Considerable attention was also paid to the analysis of methods used in the research. Most stations showed lengthening of growing season and summer during the twentieth century. Decennary average length of growing season and summer shortened in the years 1971-1980. The comparison of output data of regional climate models HIRHAM and RCAO and measured station data showed that the thirty-year average lengths of growing season and summer estimated by the two models were reasonably accurate approximately half of all cases. The models' estimates were not accurate at all concerning decennary averages. Keywords: robust locally...
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Changes of length of periods with characteristic temperatures
Černochová, Eva ; Metelka, Ladislav (referee) ; Kalvová, Jaroslava (advisor)
Title: Changes of lengths of periods with characteristic air temperatures Author: Eva Černochová Department: Department of Meteorology and Environment Protection Supervisor: doc. RNDr. Jaroslava Kalvová, CSc. Supervisor's e-mail address: jaroslava.kalvova@mff.cuni.cz Abstract: Lengths of periods with characteristic air temperatures were derived using two different methods (linear interpolation, robust locally weighted regression) for 10 stations in the Czech Republic and for output data of regional climate models HIRHAM and RCAO in 4 grid points. Averages for a forty-year period (1961-2000) and for a thirty-year period (1961-1990) were computed as well as averages for every decade. Considerable attention was also paid to the analysis of methods used in the research. Most stations showed lengthening of growing season and summer during the twentieth century. Decennary average length of growing season and summer shortened in the years 1971-1980. The comparison of output data of regional climate models HIRHAM and RCAO and measured station data showed that the thirty-year average lengths of growing season and summer estimated by the two models were reasonably accurate approximately half of all cases. The models' estimates were not accurate at all concerning decennary averages. Keywords: robust locally...
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Zpracování dlouhodobých řad aktivních a efektivních teplot
Kourek, Zdeněk
The work analyzes the meteorological element air temperature at three climatological stations. The aim was to assess changes in the values of temperature sum, and the sum of active temperatures (sum of temperatures over specified threshold) and the sum of effective temperatures (sum of temperatures over specified threshold - defined threshold) for the period 1961-2009. At the same time large vegetation season (number of days when the average daily temperature is consistently above 5 ° C), the main (number of days when the average daily temperature is consistently above 10 ° C the growing season) and the growing years (number of days when the average daily temperature is consistently above 15 ° C) was analyzed. On the basis of calculating the sum of active and effective sum, we can say that their values increase with time, as far as the number of days in the growing seasons. The results are regionally different.
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