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Abstrakty/Abstracts

Zprávy České botanické společnosti 45/2, 2010


Abstrakty/Abstracts


Trávníček B.
Ladoňky (rodScilla s. lat.) v České republice. II. Taxony pěstované a zplaňující
Squills (Scilla s. lat.) in the Czech Republic. II. Cultivated and escaped taxa

Abstract
Cultivated species of the genera Hyacinthoides Medik., Fessia Speta, Nectaroscilla Parl., Oncostema Raf., Othocallis Salisb., Prospero Salisb. and Scilla L. in the Czech Republic (and C Europe) are reviewed. Data on the occurrence of escaped species [Hyacinthoides hispanica (Mill.) Rothm., Othocallis amoena (L.) Trávníček, O. siberica (Haw.) Speta, Scilla sardensis (Barr et Sugden) Speta and S. forbesii (Baker) Speta] from the Czech Republic are summarised. The paper includes a morphological description of the species and a list of their localities. Map of the adventive distribution of Othocallis siberica in the Czech Republic is also added.

Zdražílková M.
Polní plevele v okolí Mikulova na jižní Moravě
Weeds in the surroundings of Mikulov town in South Moravia

Abstract
This work evaluates the state of arable weed communities in the south-eastern part of the Czech Republic. The basis of this work is a set of 154 phytosociological relevés made between the years 1996 and 2002. They document the existence of six associations belonging to the Caucalidion lappulae, Fumario-Euphorbion and Panico-Setarion alliances. For each association a characterisation is provided, using a group of diagnostic species and a group of constant species. Each association is also documented in a synoptic table. All of the relevés were subjected to ordination analysis. Season, the amount of light and the content of nutrients showed significant effects on the composition of the weed vegetation. The effect of management (managed by agricultural companies vs. private farming vs. organic farming) did not show to be very significant. The presence of 10 endangered weed species is documented by a list of localities. The species Panicum miliaceum subsp. agricolum was often documented in the study region. This weed morphotype of millet is not as rare in South Moravia as the literature states.

Boublík K.
Vegetace jedlových lesů moravských Karpat
Vegetation of silver fir (Abies alba) forests in the Moravian Carpathians (Czech Republic)

Abstract
A phytosociological classification of silver fir (Abies alba) forests in the Moravian part of the Carpathian Mts. (eastern part of the Czech Republic) was carried out using the Braun-Blanquet approach. It is based on the formalised Cocktail classification method. Definitions of associations were created by combinations of sociological species groups using logical operators. Dominance of individual species was included in the definitions of associations. All relevés with at least 50 % cover of silver fir in the tree layer available from the studied area were used in the analysis. Four associations within the Querco-Fagetea class were distinguished. Luzulo-Abietetum albae (Luzulo-Fagion) is an acidophilous spruce-fir forest association characterised by dominance of graminoids and low shrubs (Avenella flexuosa, Calamagrostis arundinacea, Luzula luzuloides, Vaccinium myrtillus) in the herb layer. Nutrient-demanding species such as Carex digitata, Galium odoratum, Gymnocarpium dryopteris, and Sanicula europaea are typical of stands of herb-rich mesotrophic Galio rotundifolii-Abietetum albae association (Fagion sylvaticae, Galio rotundifolii-Abietenion). Scree forests (Tilio platyphylli-Acerion) dominated by silver fir occur rarely in the studied region. They are classified into the Fraxino excelsioris-Aceretum pseudoplatani and Arunco-Aceretum associations. The syntaxonomical scheme, results of the Cocktail classification and the origin of fir forests are discussed.

Gerža M.
Vegetace tříd Scheuchzerio palustris-Caricetea nigrae a Oxycocco-Sphagnetea v Orlických horách a jejich podhůří
Vegetation of the classes Scheuchzerio palustris-Caricetea nigrae and Oxycocco-Sphagnetea in the Orlické hory Mts and their foothills

Abstract
The study deals with a phytosociological research of peatland vegetation in the Eagle Mts. (Orlické hory) and their foothills. The research was conducted during the period 2001-2008. A total of 114 relevés were recorded. In the analysis, 77 relevés by other authors were used. Altogether 5 groups of plant community were distinguished. They include the following associations: Drepanoclado fluitantis-Caricetum limosae (group 1), Eriophoro vaginati-Sphagnetum recurvi and Andromedo polifoliae-Sphagnetum magellanici (group 2), Carici echinatae-Sphagnetum and Sphagno recurvi-Caricetum rostratae (group 3), Sphagno warnstorfii-Eriophoretum latifolii and Valeriano dioicae-Caricetum davallianae (group 4), and Caricetum nigrae (group 5). The vegetation of bogs, calcareous fens and extremely rich fens are the rarest types of peatland vegetation of the Eagle Mts. and their foothills. The peatland vegetation is important for endangered plant species, such as Andromeda polifolia, Carex davalliana, Carex limosa, Carex pauciflora, Dactylorhiza majalis, Drosera rotundifolia, Eriophorum latifolium, Oxycoccus palustris, and Sphagnum subnitens.