Global ETD Search

1	Evaluation of Spruce Forest Regeneration and Vegetation Changes / Evaluation of Spruce Forest Regeneration and Vegetation Changes HREŽÍKOVÁ, Markéta January 2013 (has links) The impact of a bark beetle outbreak, and the following sanitation management actions, on the mountain spruce forest in the central part of the Šumava Mountains were compared after twelve years of development. The survey was focused on natural regeneration of trees and herb-layer vegetation.
2	Vliv otevření korunového zápoje pionýrských lesů na podrost / Effect of canopy openning on undergrowth of pioneer forests Lutišan, Zuzana January 2017 (has links) 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...
3	Vliv lokální pokryvnosti dřevinného patra na bylinnou vegetaci na malé prostorové škále / Influence of local woody species coverage on herb vegetation on a small spatial scale Kubát, Miloš January 2010 (has links) English abstract This work aims on influence of local coverage of woody layer on understorey herbs. Expansion of woody species into semi-natural grassland ecosystems is accompanied by increase of local coverage of woody layer. This process leads to changes of environmental conditions in understorey, that is followed by extinction of heliophillous herb species. This works deals with this phenomenon on a small spatial scale. The research took place near former village Tocov, situated in an abandoned landscape in Doupovské hory. This locality is typical example of woody species expansion into species rich grassland. Here, 399 phytocoenological relevés were collected. These relevés are ordered into triplets, that make triangles. There are local coverage of woody layer measured for each relevé. Impact of this variable was tested in two sizes of the observation window. Single relevés present microsites, while whole triplets present sites, where variability of local covarage of woody layer, leading to variability in herb layer, could be distinguished. Number of herb species is linearly negatively correlated with local coverage of woody layer on a smaller scale of single relevés. In whole triplets, increase of local coverage of woody layer, during early stages of woody species expansion, doesn't lead to decrease of...
4	Floristic Survey of the Terrestrial Vascular Flora of Strouds Run State Park, Athens County, Ohio Harrelson, Sarah 19 April 2005 (has links) No description available. Invasive Species Flora (Ohio) Ant-dispersed species Medicinal Herbs Land Use History Herb Layer
5	Vliv pěstování jehličnatých monokultur na diverzitu rostlin / Effect of coniferous monoculture plantation on plant species dversity Němeček, Jakub January 2012 (has links) A structure and a function of a monoculture woodland is diferent from the natural woodland condition. This is an influence of a herb layer diversity. The change of the herb layer are mainly distinguishable in the case of tree coniferous monoculture. They are the poorest at all of them viewpoint diverzity. The diversity of the woodland was analysed with an insuffiently consequence. This study get the knowledge about the species composition and the diversity of these monoculture. At the same time get the knowlege about next factores, which change diversity and species composition of stand. As a confirmation of this, coniferous monoculture are numerously and species-compositionally diferent from broadleave monoculture. And more, coniferous trees change the enviroment's condition and the whole biotopes. There are not depend any species of the herb layer at the coniferous monoculture on this studied site of Křivoklátsko.
6	Rizika rozpadu a regenerační potenciál smrkových porostů pod vlivem abiotických a biotických stresorů v revíru Štěkeň / Decay risks and regeneration potential of spruce stands under the influence of abiotic and biotic stressors in the district Štěkeň. STRNADOVÁ, Marta January 2011 (has links) The thesis builds on the bachelor thesis in which the goal was to assess the current state of health and to estimate the environmental risk of spruce stand destabilization in the forest complex Brdo. The aim of this thesis was to assess the regenerative potential of spruce stands in the same location on the basis of crown condition analysis of adult spruce stands and of studies of natural regeneration and subsequent seedling survival in various categories of land cover. Obtained results were processed using analysis of variance with hierarchical structure.
7	Secondary succession toward woodland - Changes in the herb layer species composition / Secondary succession toward woodland - Changes in the herb layer species composition DOSTÁLOVÁ, Alena January 2010 (has links) 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.
8	Herb layer characteristics, fly communities and trophic interactions along a gradient of tree and herb diversity in a temperate deciduous forest / Krautschichteigenschaften, Fliegengesellschaften und trophische Interaktionen entlang eines Baum- und Krautartengradienten in einem temperaten Laubwald Vockenhuber, Elke 16 August 2011 (has links) No description available. 570 Biowissenschaften Biologie Biodiversität Wald Diptera trophische Interaktionen Krautschicht Baumdiversität Herbivorie Bestäubung Samenprädation Hainich Insekten Phoridae Empidoidea biodiversity forest Diptera trophic interactions herb layer tree diversity herbivory pollination seed predation Hainich insect Phoridae Empidoidea 42.91 Terrestrische Ökologie WNI 000: Biodiversität allg. {Biologie Ökologie} WNA 250: Wald Urwald {Biologie Ökologie}

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