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Effect of canopy openning on undergrowth of pioneer forests
Lutišan, Zuzana ; Vojta, Jaroslav (advisor) ; Hofmeister, Jeňýk (referee)
Canopy gaps created by falling or the death of one or more trees in the closed canopy forests are a natural part of the temperate forests in temperate zones. There are studies that describe this disturbing mechanism helpful in forest restoration and regeneration of primary virgin forests. Much more frequent in the forests of the Central European country, however, are secondary forests, which originated in the area after the previous human impact in places that were gradually abandoned and successionally overgrown up to the stage of forest communities. And in this type of forest, I tried to capture the effect and impact on vegetation clearings in the undergrowth. The results, presented in this paper come from the area Doupovské mountains, of the military area Hradiště, where there are fragments of pioneer forests established after the displacement of the population in the 50s of the last century. The goal of this thesis was to find out how these canopy gaps affect species composition and diversity of undergrowth pioneer forests and how important are selected environmental conditions on the composition and diversity of undergrowth vegetation. I was able to show that gaps in pioneer forests create an environment for species that normally don't occur under the closed canopy. Light has a significant...
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Interactions between animals and plants in urban forests
Dobešová, Jana ; Vojta, Jaroslav (advisor) ; Horčičková, Eva (referee)
INTERACTIONS BETWEEN ANIMALS AND PLANTS IN URBAN FORESTS ABSTRACT This Bachelor thesis focuses on the influence of big mammals (especially Cervidae, wild boars, badgers and foxes) on herb understory in urban forests. Cities are continuously expanding and thus occupy natural habitats of the animals. Therefore, these animals are habituating in urban forests. The specific conditions of both urban and forest habitats and their influences on animal and plant distribution are mentioned. From the possible influences of animals on herb understory, special emphasis is put on herbivory, which can affect individuals, populations and even whole plant assembly. The influence of trampling, urination and burrowing are also investigated. Finally there is a summary of big mammals' influence in relation to human influences. Key words: Urban forests, herbivory, herb layer, disturbation, nutrients, large mammals
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Secondary succession toward woodland - Changes in the herb layer species composition
DOSTÁLOVÁ, Alena
This dissertation focus on spontaneously developed forests (SDFs) on mesic stands. The present tree layer was described and the possible changes in the tree layer was estimated. Influence of site- and context-dependent factors on the species composition and general character of the herb layer was studied in detail. An experiment was established to study seed and safe-site limitation of nine forest herb species.
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