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Ph.D. Thesis |
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Title: Diversity of perennial ruderal vegetation of the Czech Republic
Perennial ruderal vegetation has been traditionally ranked into many vegetation units in the Czech phytosociological classification system. The units are distinguished mostly according to the expert opinion and usually without any detailed analyses. For the revision of the current classification a large data set of phytosociological relevés, taken from the Czech National Phytosociological Database (www) is used. The data set is analysed by means of numerical classification (cluster analysis, Twinspan) and methods of gradient analyses. The Cocktail method in the program JUICE (www) is used to define the associations in a formal way. The explicit criteria for assignment of relevés to the associations are defined by combinations of sociological species groups (created by the Cocktail method using the geografically stratified data set of about 43 800 relevés of all vegetation types of the Czech Republic) and also by dominance of some species.
Main aims · To create the formal definitions of associations of perennial ruderal vegetation using the Cocktail method · To identify and describe the main gradients of variability in species composition of this vegetation
The study will be a part of the second volume of the monograph Vegetation of the Czech Republic (ed. M. Chytrý) dealing with synanthropic vegetation.
Links Summary of Ph.D. Thesis (in English) Presentation of Ph.D. Thesis, 2.4.2009 (in Czech)
Project „Vegetation of the Czech Republic“ (www) Vegetation Science Group (www) Long-term research plan (www)
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