Idős tölgyesek az Alsó-Duna árterén

Kovács, Gyula and Deme, Tamás (2008) Idős tölgyesek az Alsó-Duna árterén. SOMOGYI MÚZEUMOK KÖZLEMÉNYEI (2008-), 18. pp. 43-50. ISSN 2060-1980

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Abstract

The riparian forests of Hungary are unique in all of europe. These are parts of the few habitats where a semi- natural vegetation could have remained or re-grown, in spite of the human interference. In 2002 we wrote up the nearly 10 years of study about the forests of Beda-Karapancsa, in the lower Danube riparian area. We evaluated more than 8000 ha area on the digital map and data-base of the Duna- Drava National Park and we gained the data about the forests from the Forestry Database of the National Forestry service. Together with our colleagues we did detailed botanical and ornithological research in 15 parts of these forests. Thematic maps were made to show the distribution of exotic tree spe- cies as well as the locations of protected plant and bird spe- cies. During this research it turned out that the percentage of the old-grown oak-ash-elm hardwood forests ( Fraxino pannonicae-Ulmetum ) is extremely low, hardly reaching 2%. With cautious estimation this is less than one tenth of the potential habitats, moreover only strongly fragmented patches of these forests exist. In many cases their places were taken over by monocultures consisting of exotic tree species, such as Black Walnut ( Juglans nigra ) and Poplar hybrids ( Populus x. euramericana ).

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