Electronic expert system for identification of Slovak grassland vegetation
2007
Janišová, M., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Botany | Škodová, I., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Botany
We focused on the analysis of phytosociological releves from semi-natural grassland communities belonging to phytosociological classes Molinio-Arrhenatheretea, Festuco-Brometea and Nardetea strictae stored in the Central Phytosociological Database located in the Institute of Botany, Slovak Academy of Sciences, Bratislava. The main aim was to create an electronic expert system to identify grassland vegetation types unambiguously and to be easily applied also in landscape planning and nature conservation. All accessible published releves were compiled and, simultanously, an extensive field survey was carried out with the aim to record the actual stage of semi-natural grasslands in Slovakia after the period of profound land-use changes. The analyzed database of grassland vegetation contained 11 121 releves, collected by 143 authors between 1924 and 2006. We worked at three basic syntaxonomical hierarchical levels: classes, alliances and associations and we recognized variants as a classification unit at the hierarchical level below the association. We performed the supervised classification method Cocktail which imitates the traditional phytosociological classification approach using the sociological groups of species. The formal definitions are then formulated by means of presence/absence of sociological species groups combined with the dominance criteria of selected individual species. The validity of traditionally accepted syntaxa was checked and the scope of individual associations was revised. The developed expert system was applied on the testing data set from the Starohorské vrchy Mts. and the effectivity of grassland identification was evaluated for this region. The practical application of the proposed expert system will be demonstrated during the lecture.
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