|
|
Fixace dusíku v půdách malých lesních povodí v České republice
MICHALČÁKOVÁ, Petra
This bachelor thesis summarises the information about nitrogen fixation with an emphasis on the biological non-symbiotic (free-living organisms) fixation in soil of temperate coniferous forests and it also discusses critical factors, which have an impact on the fixation efficiency. The experimental part evaluates the potential rate of non-symbiotic nitrogen fixation in soil samples from fourteen temperate forest catchments in the Czech Republic. The 15N2-incorporation method was used, complemented by the determination of the quantity of the bacterial nifH gene, which encodes one of the nitrogenase's proteins.
|
|
|
Bacteria associated with decomposing deadwood
Tláskal, Vojtěch ; Baldrian, Petr (advisor) ; Uhlík, Ondřej (referee) ; Bárta, Jiří (referee)
Deadwood is a hotspot of microbial diversity and its decomposition contributes to carbon and nitrogen cycling in temperate forests. The historically recognized importance of fungi in the decomposition of deadwood has recently been complemented by the description of bacterial functions thanks to the rapid progress of culture-independent methods based on the analysis of nucleic acids. To study different aspects of deadwood decomposition, a temperate mixed forest in Zofinsky prales National Nature Reserve was selected as a site with rich historical forestry data where deadwood decomposition represents an important process in wood turnover. The aim of this thesis is to describe role of bacteria in deadwood decomposition at fine scale resolution with respect to community composition, enzyme transcription, and metabolic potential of dominant species. Effects of deadwood age together with pH and water content on the bacterial community composition proved to be more important than tree species identity. Bacteria showed distinct composition between early and late community in decomposing deadwood. The bacterial community was also under a significant influence of fungal community composition. Despite being in a close contact, bacterial and fungal communities differed significantly between deadwood and the...
|
|
|
The influence of climbing legumes on presence of valuable and weedy species in permanent grasslands
HRAŠE, David
Permanent grassland is a complex of legumes, herbs, and grasses. They are an important plant component of the biosphere. They provide wide range of productive and non-productive functions. Climbing legumes are valuable species in grasslands. They are involved in higher quality of fresh matter and hay. The aim of this diploma thesis is to assess the influence of climbing legumes on the presence and coverage of other higher plant species in grassland, the height and productivity of vegetation in selected localities in the Prachatice district in 2017. The occurrence of legumes (climbing and non-climbing) has a significant impact on other species in the grassland community. The reason is the ability to fix aerial nitrogen and support grass species that require a good nitrogen supply. The obtained data were statistically processed.
|
|
|
Ecological study of invasive species \kur{Lupinus polyphyllus}
HURTOVÁ, Jaroslava
Species Lupinus polyphyllus is one of the most hazardous invasive species in the Czech Republic and its increasing occurence represents a threat of native biodiversity not only in the flora of conservation areas. Influence of management experiments on invaded communities was studied on permanent plots founded on three localities in the Šumava National Park. The role of nitrogen fixed in this invasion was explored by analyzing of soil samples. Influence of allelopathic inhibition of invasive species on some coexisting native species was tested in the laboratory experiment.
|
guest ::
