National Repository of Grey Literature 25 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Environmental risks of afforestation of agricultural land by alien trees: the invasive black locust (Robinia pseudoacacia) as a model species
Sádlo, Jiří ; Vítková, Michaela ; Pergl, Jan ; Pyšek, Petr
Short-lived plantations for renewable bioenergy production are currently fashionable. Poplars and willows are usually used for this purpose, however other species including dangerous invasive (e.g. Robinia pseudoacacia or Ailantus altissima) are tested in the Czech Republic. Current legislation both within the EU and on the national level deals with the species selection suitable for short-lived plantations only marginally. Black locust as well as other invasive species with similar life strategy can not be recommended for afforestation of agricultural land in the Czech Republic.
Species diversity of dry basic habitats enclaves within forest environment in the Doksy region: effect of abiotic factors and historical land use
Martinec, Pavel ; Sádlo, Jiří (advisor) ; Novák, Jan (referee)
The primary aim of this thesis was to examine variables that explain species variety of dry bazic biotopes in forrest areas of Doksy landscape. The most important variables are geology, history of biotypes, existence of rock, amount of solar radiation, existence of land disturvation, declinationi and area of biotopy. By the PCNM methodoloby The thesis has examined also area related variables. Primary goal was to examine history related variable that explain 1,2% of the whole species diversity. The thesis distinguished special species with high inclination to historically stable biotopes and those, that are highly correlated with specific land use.The area covered with species-poor acidophilous pine forests on sandstone with isolated patches of basic bedrock with a species-rich flora. In total, 149 localities differing in history were studied. Some anthropogenic disturbances and local history. Main questions: What is the distribution pattern of patches with basiphilous flora and which environmental factors drive their species composition? How the historical land-use since the half of 19th century can influence the current species composition? How is the historical impact detected by functional species traits? Keywords: Secondary habitats, dry calcareous habitats, Pinus sylvestris, abandoned...
Environmental gradients during Late Glacial in Central Europe
Petr, Libor ; Sádlo, Jiří (advisor) ; Magyari, Eniko (referee) ; Roleček, Jan (referee)
The Lateglacial and Early Holocene are key periods with respect to the understanding of the present-day vegetation and environment. An interdisciplinary approach is important for the study of these changes. Only by interlinking biological and geoscience evidence can we obtain a more comprehensive picture of this key period. It is not possible to interpret any pollen spectrum in the sedimentary record without knowledge of the history of the locality and its vicinity. Rapid climate changes had a crucial effect on the environment and vegetation. Continentality of the climate and a deficit of precipitation amplify the effect of local conditions. Vegetation, as in the case of vertebrates and molluscs, comprises a combination of species of a continental steppe, mountain biotopes and disturbed habitats. This facilitated contact among species and populations that are biogeographically separated at present. Vegetation of the Lateglacial period in the Czech Republic ranges in character from frost barrens in the mountains, through steppe-tundra vegetation at medium altitudes to a continental steppe in the lowlands and pine woodlands constrained to a moist floodplain. The Western Carpathians were covered by a taiga. In the Pannonian Lowland, there were open forests with conifers and broadleaved woody plants....
Forest vegetation changes in the Bohemian Forest during the second half of 20th century
Prach, Jindřich ; Kopecký, Martin (advisor) ; Sádlo, Jiří (referee)
Long-term forest vegetation changes were studied in the Bohemian Forest and its foothills. New vegetation relevés were taken at sites of typological plots established by forest engineers between 1955 and 1980. Data from 158 semi-permanent plots were analysed using modern statistical methods. The data show significant changes and homogenization of the vegetation. Ellenberg indicator values indicate eutrofication. Repeated measurements of soil pH suggest acidification, but the interpretation of these data is complicated by methodological problems. The forests under study exhibit high spatial variability. No main prevailing trend in vegetation changes was found. The changes are considered to be related to sulphur and nitrogen deposition and forest management. The influence of increasing age of forest stands seems to be unimportant. Discussed are not only vegetation changes and their possible causes but also the possibilities and limitations of using such old forestry data in botanical and ecological studies.
Basis for conservation assessment of Plant diversity of dry basic habitats within the forest environment in the Doksy region
Martinec, Pavel ; Sádlo, Jiří (advisor) ; Pivnička, Karel (referee)
Theme: Basis for conservation assessment of Plant diversity of dry basic habitats within the forest environment in the Doksy region Abstract: The subject of present study is high species richness of vascular plants on localities of dry basic habitats in Doksy region. This habitats are enclosed by nutrients poor habitats of coniferous forests, restricted to small areas and spatially isolated. The dry basic habitats represent high valuable areas for nature conservation due to high α-diversity and occurence of rare plant species with scarce populations within flora of Czech Republic. The aim of study is to collect and review known data about dry basic habitats of Doksy region and their biodiversity. Consequently find optimal approaches in analysis of biodiversity and approach in interpretation for nature conservation. Actual status of flora and vegetation depend on environmental factors, biotic interaction, evolution and historic development. The perspective theoretical approach in species diversity analysis shows the species-pool hypothesis (Taylor et al. 1990) which assorts and describes these factors. Keywords: biodivesity, vascular plants, Doksy region, species-pool hypothesis, nature conservation
Vegetation of fir- and calcicolous beech forests of the Czech Republic
Boublík, Karel ; Sádlo, Jiří (advisor) ; Roleček, Jan (referee) ; Ewald, Jörg (referee) ; Walentowski, Helge (referee)
Boublík K. (2009): Vegetation of fir- and calcicolous beech forests of the Czech Republic. - Ms., 104 p. [PhD thesis; depon. in: Library of the Department of Botany, Faculty of Sciences, Charles University, Prague] The thesis proposes Braun-Blanquet phytosociological classification of calcicolous beech forests and fir forests of the Czech Republic. Calcicolous forests dominated by Fagus sylvatica (Fagion, Cephalanthero-Fagenion) were defined with the help of two approaches: (i) selection on the basis of correspondence of species composition with an expert delimited species group and (ii) the formalized and supervised Cocktail method. In the case of the Cocktail method, the definitions of associations were created by combinations of sociological species groups using logical operators. Dominance of single species was included in the definitions of associations. Only one association (Cephalanthero-Fagetum) was distinguished. This association usually occurs on limestone, calcareous sandstone and calcareous sandy marlite. However, it can be found also on basalt and phonolite. TWINSPAN analysis distinguished three vegetation types within Czech calcicolous beech forests which are interpreted as subassociations of Cephalanthero- Fagetum: (i) Cephalanthero-Fagetum seslerietosum caeruleae occurring on...
Komárov a Čenkov. Regional probe into evolution of the landscape of Brdy.
Röschová, Kateřina ; Sádlo, Jiří (referee) ; Matoušek, Václav (advisor)
This paper looks into the evolution of Brdy, a mountain lands- cape in central Bohemia covered mostly by forests, examining the period from late Middle ages until the end of the Second World War. From the 15th century it was an important iron production center of whole Bohemia. The region provided all that was needed - iron ore, timber, wa- ter and was conveniently located near trade centers. During the industrial revolution (1800-1873) the industry grew. Small plants disappeared and the production was concentrated into emerging industrial centers. The forests, cleared of iron production, started to attract the attention of tourisms, youth organizations and tramps. The mountain range with large forest areas drew also the attention of the Ministry of Defense, which decided to establish an artillery range in the area. The changes of landscape are illustrated by examples of two land registers - Čenkov and Komárov.

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