Nová lokalita křivatce českého (Gagea bohemica) u Náměště nad Oslavou
New site of Gagea bohemica near Náměšť nad Oslavou
Jan Roleček: Botanický ústav AV ČR, v.v.i., Oddělení paleoekologie, Lidická 25/27, CZ-602 00, Brno, e-mail: honza.rolecek@centrum.cz; Ústav botaniky a zoologie, Přírodovědecká fakulta, Masarykova univerzita, Kotlářská 2, CZ-611 37, Brno
Abstract: This paper provides information on a newly found peripheral site of the highly threatened Gagea bohemica in the Oslava river basin, in Špilberk Nature Monument and Site of Community Importance near Náměšt‘ nad Oslavou. The population consists of about 30 flowering plants and grows in a typical habitat on the summit of a hill with shallow acidic soil at the edge of a small rock outcrop. From the phytosociological point of view, the species inhabits thermophilous acidophilous vegetation of spring ephemerals of the Festuco-Veronicetum dillenii association, classified in the Arabidopsion thalianae alliance and Koelerio-Corynephoretea class. The species may have long been overlooked due to the persistence of sterile plants under suboptimal conditions. These conditions have improved after introducing intensive sheep grazing, which significantly reduced vegetation cover and enriched the soil with nutrients. Steppe hills such as Špilberk near Náměšt‘ are a characteristic feature of the landscape at the south-eastern margin of the Bohemian Massif. This landscape has been influenced by man since prehistoric times and numerous non-forest species have long persisted and spread here.
Key-words: Bohemian Massif, Czech Republic,floristics, Gagea bohemica, threatened species
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