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Low abundance of Archaeorhizomycetes among fungi in soil metatranscriptomes
CHOMA, Michal
The abundance of Archaeorhizomycetes, a recently discovered fungal lineage, in soil fungal communities is disputed. Majority of the estimates is based on techniques involving polymerase chain reaction (PCR), which might be source of bias. This thesis aimed to assess the abundance of Archaeorhizomycetes in PCR-independent soil metatranscriptomes from several different ecosystems.
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Vliv antropogenních vstupů dusíku na strukturu a funkci ektomykorhizních společenstev smrkových lesů
CHOMA, Michal
The effect of anthropogenic nitrogen (N) inputs on the structure of ectomycorrhizal fungal communities in Norway spruce forests was investigated. With the use of soil DNA amplicon sequencing, ectomycorrhizal communities were described in spruce forests exposed historically to different anthropogenic N deposition and experimental manipulative N treatments. This information was put into context with soil biochemical properties and rates of soil processes involved in C and N cycling in order to reveal possible consequences of ectomycorrhizal community restructuring for soil and ecosystem functioning.
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Mineralization of nutrients during the process of spruce dead wood decomposition in the mountain forest
Višňová, Anna ; Hofmeister, Jan (advisor) ; Choma, Michal (referee)
Summary: This thesis is focused on collecting information on the importance of dead wood on biogeochemical cycles of chemical elements in the mountain forest ecosystems of central Europe. The goal of this thesis was to determine the concentration of various elements(C, N, P, Ca, Mg, K, Na, Mn, Al, Fe) in the coarse woody debris of spruce samples of different age, stage of decomposition which were collected in different localities in the national park Šumava. Another goal was to determine the speed of which these elements are released from the dead wood. The information on the quantity of different elements and the speed of their release is currently lacking and could lead to better understanding of various biogeochemical cycles of elements in the mountain forest. During the decomposition the concentration of the elements N, P, Al and Fe increased whereas the Kalium concentration decreased. The other elements' (C, N, Ca, Mg, Mn) concentrations varied. Carbon constituted approximately 50% of weight in all of the samples analyzed. We carried out a laboratory experiment based on decomposition of dead wood samples in various stage of decay during a period of six months. The released concentration of CO2 was measured at two to four weeks intervals. The release of CO2 continually decreased during the experiment.....
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Remediation of the old landfill Písek - Ptáčkovna
CHOMA, Michal
The goal of this thesis is to summarize and evaluate the remediation of the landfill Písek {--} Ptáčkovna. The landfill hasn{\crq}t been remediated in the typical way due to lack of financial sources. The easiest and cheapest actions have been taken. Though the landfill impacts its environment by increased concentration of chlorides in the landfill leachate, which is let-out to neighbouring stream, no significant threat to surrounding ecosystem was proved.
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