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Effect of distance from the plant on the intensity of interaction between plants and soil
Skydaniuk, Liudmyla ; Münzbergová, Zuzana (advisor) ; Mudrák, Ondřej (referee)
The concept of plant-soil feedback is increasingly used to explain plant-community interactions. As plants grow, they change the conditions in the surrounding soil environment. These soil changes affect further plant growth. We call this effect plant-soil feedback (PSF). The effect of PSF is typically studied directly in the place where the plant grows. How far from the plant this effect can be, however, is little explored, but this knowledge is important for understanding the structure of plant communities. The main goal of thesis was to investigate the effects of the distance from the plant on the intensity of intraspecific and interspecific feedback between the plant and the soil. The research was conducted using a classic, two-phase experiment. Four species were selected for the research, forming two pairs of one grass and one broad-leaved herb each time. The first pair were Bromus erectus and Inula salicina occurring naturally on dry lawns in northern Bohemia. The second pair were Calamagrostis epigeios and Daucus carota, occurring on lignite dumps in Sokolovsk. The species were cultivated during the cultivation phase in the soil of their origin, it means the soil of the dry lawn of northern Bohemia or the Sokolovsk dump, either each species of the pair was cultivated separately or both...
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Rozdílné mikrobiální aktivity v rhizosféře trav Festuca ovina a Calamagrostis epigejos
Filipová, Lenka
The diploma thesis "Different microbial activity in the rhizosphere of grasses Festuca ovina and Calamagrostis epigejos" deals with the issue of climate change and eutrophication and their impact on the stability of rare habitats, specifically dry acidophilous grasslands in the Podyjí national park. The aim of the thesis is to study and collect the available sources about the issue of the interaction of soil microorganisms and plant roots in exceptional and protected dry grassland ecosystems, which are colonized by aggressive expansion of Calamagrostis epigejos, thereby compromising their integrity and stability. This issue is still not fully understood. Review of literature in the thesis describes the explanation of the most significant part of the issue - the nutrient cycling in ecosystems, C: N ratio, the role of microorganisms in the soil, and the importance of microbial processes in the rhizosphere and in grassland ecosystems generally. In the experimental part the hypothesis - that drought stress and eutrophication causes changes in the plant - microorganisms - soil system, which result in destabilization of the system, by an increase in leakage of nitrate and ammonium ions from the soil, and in changes in the quantity and quality of underground and aboveground biomass of Festuca ovina -- was confirmed.
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