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Classification of weed vegetation of arable land in the Czech Republic and Slovakia
Authors:Zdeňka Lososová  Milan Chytrý  Šárka Cimalová  Zdenka Otýpková  Petr Pyšek  Lubomír Tichý
Institution:1. Institute of Botany and Zoology, Faculty of Science, Masaryk University, Kotlá?ská 2, CZ-611 37, Brno, Czech Republic
2. Department of Biology, Faculty of Education, Masaryk University, Po?í?í 7, CZ-603 00, Brno, Czech Republic
3. Department of Biology and Ecology, Faculty of Science, Ostrava University, 30. dubna 22, CZ-701 03, Ostrava, Czech Republic
4. Institute of Botany, Academy of Sciences of the Czech Republic, CZ-252 43, Pr?honice, Czech Republic
5. Department of Ecology, Faculty of Science, Charles University, Vini?ná 7, CZ-128 01, Praha, Czech Republic
Abstract:Numerical classification of 2653 geographically stratified relevés of weed vegetation from the Czech and Slovak Republics was performed with cluster analysis. Diagnostic species were determined for each of the seven main clusters using statistical measures of fidelity. The classification reflected clear distinctions between lowland (mostly calcicole) and highland (mostly calcifuge) sites, spring and summer phenological stages, and cereals and root crops. The results of the cluster analysis were compared with traditional phytosociological units. Two clusters corresponded to calcifuge weed vegetation of theScleranthion annui alliance; one cluster represented the vegetation of root crops on moist soils of theOxalidion europaeae alliance; one cluster contained thermophilous weed vegetation of theCaucalidion lappulae alliance; two clusters included weed vegetation of root crops and of stubble fields, which can be assigned to theCaucalidion, Panico-Setarion,Veronico-Euphorbion andEragrostion alliances; one cluster included vernal weed vegetation in little disturbed habitats of theCaucalidion lappulae andScleranthion annui alliances. Our analysis did not support the concept of theSherardion andVeronico-Taraxacion alliances, which were included in earlier overviews of the vegetation units of the Czech Republic and Slovakia.
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