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Detection and localization of cyanobacterial inoculum in the sediments - use knowledge of life strategies to minimize health risks
Šejnohová, Lenka ; Maršálek, Blahoslav ; Novotná, Zlatica ; Maršálková, Eliška
Water bloom (WB) is a global problem that is particularly closely linked with increased inputs of phosphorus to surface waters.. The subsequent accumulation of nutrients in the tank for the development not only of cyanobacteria in the water column, but also their survival in resting stages in the sediment. The quantity (amount) of inoculum (source) of cyanobacteria in the sediments is the primary factor, along with nutrient and climatic conditions, correlates with the resulting amount of algae in the water column during the summer season. Cyanobacterial resting stages in sediments require specific conditions for survival, which moreover genus from the genus (or species), cyanobacteria differ. Knowledge of the life cycle of cyanobacteria is therefore an essential prerequisite for starting a guide to environmentally friendly, with the current low cost of funds, limit the development of WB.
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Below-ground organs of plants
Volume presents 16 contributions covering broad scale of root research in the Czech Republic. Included are papers on methodology of root biomass assessment, methodology of herb-chronology, introduction of database of belowground organs, several case studies on root foraging, vegetative regeneration from adventitious buds on roots etc.
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Collection of aquatic and wetland plants, Institute of Botany, Academy of Sciences of the Czech Republic, Třeboň
Navrátilová, Jana ; Husák, Štěpán ; Adamec, Lubomír ; Dvořáková, Kateřina
The Collection of Aquatic and Wetland Plants of the Institute of Botany AS CR in Třeboň was founded in 1976 with the aim to enable ex situ studies of threatened plant species. Since that time the Collection has provided plant material for experiments, repatriation of threatened species, taxonomical studies, and botanical illustrations for the compendium Flora of the Czech Republic. It is also used as an educational collection for university students and public. Since 1998, the seeds from the Collection (about 150–200 species each year) have been collected and offered for exchange to other institutions and botanical gardens within the Index Seminum. The Collection of Aquatic and Wetland Plants is located in the Section of Ecology of the Institute of Botany in Třeboň on an area of about 0.04 ha and its current design come from 1997. The Collection includes more than 400 species grown in outdoor containers and in a greenhouse. The overwhelming majority of these species are native to the Czech Republic; the others are mainly from other parts of the northern temperate zone. The Collection of Aquatic and Wetland Plants is the largest collection of living higher aquatic and wetland plants in Europe and one of the largest collections in the world.
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Vegetation and geobiocoenological classification of silver fir forests of the Czech Republic – preliminary results
Boublík, Karel
Preliminary results of vegetation classification of silver fir (Abies alba) forests are given. Seven communities from three alliances were distinguished in the Czech Republic. Climax stage of vegetation on the habitats of each association was investigated by geobiocoenological methods. It is claimed, that fir forests are seminatural that originated by stronger human impact (incl. fir forests on pseudogleys). They depend on forest grazing, litter raking, and other forest management. Fagus sylvatica is supposed to be dominant or frequent tree under natural conditions.
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