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Succession after reintroduction of grazing in dry grasslands
Fulínová, Martina ; Münzbergová, Zuzana (advisor) ; Hadincová, Věroslava (referee)
Grazing management is very popular nowadays and number of sites with grazing animals with the aim of restoring the sites is steadily growing. All the effects of grazing on grazed grasslands are not elucidated yet. This thesis focused mainly on the contribution of zoochory to restoration of species rich grasslands on stands cleared from Robinia pseudoacacia and stands cleared from Prunus spinosa brushwood. For the purpose of monitoring changes in vegetation, permanent plots have been established. In order to identify sources of new species occurring in permanent plots, inventory of species growing in neighbourhood of the permanent plots has been done, samples of soil seed bank, sheep buttons and seeds from sheep wool have been germinated in a greenhouse. Monitoring of permanent plots showed reduced regrowth of R. pseudoacacia and P. spinosa. We have also found that greater changes in species composition occurred in more degraded stands than in stands better-preserved. Germinating experiments proved soil seed bank being mainly the image of aboveground vegetation with minor importance to restoration of species rich grasslands. On the other hand sheep seem to be of great use for dispersal of seeds both by epizoochory and endozoochory when walking between different stands. This finding is of great importance for...
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Methods for studying seed dispersal and its importance for colonization of new sites
Vlasta, Tomáš ; Knappová, Jana (advisor) ; Hemrová, Lucie (referee)
Study of seed dispersal is crucial for understanding of several processes in life of plants and landscape. Seed dispesal is very important for persistence of local populations in fragmented landscape, it plays an important role in succession, it helps to protect plant populations againts loss of genetic variability. We usually recognize several types of seed dispersal depending on vector (dispersal by wind, animals and water.) In nature, it is very common that seed can be independently dispersed by several vectors. Therefore, studying of polychory and secondary dispersal is necessery. Methods of studying of seed dispersal are very variable, including seed traps, releasing and following individual seeds, genetics marcers etc. If we study seed dispersal, we should select the most suitable method depending on the aim of the study. We should also take into acount advantages and disadvantages of single method.
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Succession after reintroduction of grazing in dry grasslands
Fulínová, Martina ; Hadincová, Věroslava (referee) ; Münzbergová, Zuzana (advisor)
Grazing management is very popular nowadays and number of sites with grazing animals with the aim of restoring the sites is steadily growing. All the effects of grazing on grazed grasslands are not elucidated yet. This thesis focused mainly on the contribution of zoochory to restoration of species rich grasslands on stands cleared from Robinia pseudoacacia and stands cleared from Prunus spinosa brushwood. For the purpose of monitoring changes in vegetation, permanent plots have been established. In order to identify sources of new species occurring in permanent plots, inventory of species growing in neighbourhood of the permanent plots has been done, samples of soil seed bank, sheep buttons and seeds from sheep wool have been germinated in a greenhouse. Monitoring of permanent plots showed reduced regrowth of R. pseudoacacia and P. spinosa. We have also found that greater changes in species composition occurred in more degraded stands than in stands better-preserved. Germinating experiments proved soil seed bank being mainly the image of aboveground vegetation with minor importance to restoration of species rich grasslands. On the other hand sheep seem to be of great use for dispersal of seeds both by epizoochory and endozoochory when walking between different stands. This finding is of great importance for...
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