Aim: Formalized classifications synthesizing vegetation data at the continental scale are being attempted only now, although they are of key importance for nature conservation planning. Therefore, we aim to provide a vegetation classification and to describe the main biogeographical patterns of floodplain forests and alder carrs in Europe. Location: Europe.Methods: A database of more than 40 000 vegetation plots of floodplain forests and alder carrs across Europe was compiled. After geographic stratification, 16 392 plots were available for classification, which was performed using the supervised method Cocktail. We also searched for new associations using semi-supervised Kmeans classification. The main biogeographic patterns and climate-related gradients in species composition were determined using detrended correspondence analysis and cluster analysis.Results: Thirty associations of floodplain forests and alder carrs were distinguished, which belong to five alliances. The Alnion incanae includes riparian, seepage and hardwood floodplain forests in the nemoral and hemiboreal zones (dominated by Alnus glutinosa and Fraxinus excelsior) and in the boreal zone (dominated by A. incana). The Osmundo-Alnion represents oceanic vegetation dominated by Alnus glutinosa, Fraxinus angustifolia and F. excelsior distributed mostly on the Iberian Peninsula and composed of species with Atlantic distribution and Iberian endemics. The Populion albae comprises floodplain forests frequently dominated by Fraxinus angustifolia, Populus alba and P. nigra that are widespread in floodplains of large rivers under summer-dry climates in the Mediterranean region. The Platanion orientalis represents eastern Mediterranean floodplain forests dominated by Platanus orientalis. The Alnion glutinosae includes forest swamps dominated by Alnus glutinosa distributed mostly in the nemoral and hemiboreal zones. The main biogeographic patterns within European floodplain forests and alder carrs reflect the climatic contrasts between the Mediterranean, nemoral, boreal and mountain regions. Oceanic floodplain forests differ from those in the rest of Europe. The hydrological regime appears to be the most important factor influencing species composition within regions.Conclusions: This study is the first applying a formalized classification at the association level for a broad vegetation type at the continental scale. The proposed classification provides the scientific basis for the necessary improvement of the habitat classification systems used in European nature conservation.
A New Forest Association in Hungary: Thermophilous Dry Oakwood on Rubble (Paeonio Banaticae-Quercetum CerridisKevey Ass. Nova)In this paper a relic and edaphic (azonal) forest association new to science (Paeonio banaticae-Quercetum cerridis) is described and characterized. This association is compared by traditional phytosociological methods to associations with which it is in physical contact in the Eastern Mecsek Hills (Southwest Hungary). Stands ofPaeonio banaticae-Quercetum cerridisoccur on steep slopes with southern exposition between 280-640 m. The forest soil contains a large amount of rocks and rubble, and is slowly drifting. The microclimate of the forest is conducive to the survival of many species with submediterranean distribution. One of them is the endemicPaeonia banaticawhose largest populations occur in this forest type. The new association is placed in the allianceQuercion farnettoI. Horvat 1954 and suballianceQuercenion farnettoKevey in Kevey & Borhidi 2005.
-The paper lists supplementary data to the recently published Atlas Florae Hungariae, mostly from various parts of Transdanubia and the Great Plain. The list includes 72 plant species with at least one new station not shown on their grid-based range map. Certain data confirm old records, whereas some others correct erroneous distribution data. The actual habitats where the plants occur are characterized by their corresponding ÁNÉR codes. Keywords: Hungary, floristic surveys, ÁNÉR habitat codesÖsszefoglalás -Jelen dolgozat a nemrég megjelent magyarországi flóraatlaszhoz tartalmaz kiegészítő adatokat, elsősorban a Dunántúl és az Alföld különböző tájairól. A közlemény 72 növényfajról tartalmaz olyan florisztikai adatokat, amelyek a fajok elterjedési térképein új kvadrátban való előfordulásokat jelentenek. Egyes adatok régi előfordulásokat is megerősítenek, s a dolgozat néhány téves adatot is helyesbít. A növényfajok előfordulási viszonyait az ÁNÉR kódok dokumentálják.
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This paper lists supplementary data to the recently published Atlas Florae Hungariae, mostly from various parts of Transdanubia and the Great Plain. The list includes 73 plant species with at least one new occurrence previously not shown on their grid-based range map, as well as data confirming old records or correcting erroneous distribution data. The actual habitats where the plants occur are characterized by their corresponding ÁNÉR codes.
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