PHYTOSOCIOLOGICAL STUDY CONCERNING HABITATS WITH LIGULARIA SIBIRICA (L.) CASS. FROM THE SALONCA AND DELNITA RIVER BASINS, HARGHITA COUNTY, ROMAMIA
Ligularia sibirica (L.) Cass. is one of the most spectacular glacial relict species and rare species of Asteraceae family and one that suffered a significant decrease in Eurasia in the second half of the past century. L. sibirica dates from the Tardiglacial â€“ early Postglacial period. It is of a great floristic, ecological, and phytogeographical importance (Paun and Popescu, 1971), being included in Annex II and IV ofÂ theÂ HabitatsÂ Directive andÂ in the IUCNÂ RedÂ ListÂ ofÂ ThreatenedÂ SpeciesÂ asÂ DD (data deficient) (Bernhardt et al. 2011).Â According to the European Nature Information System species Natura 2000 data base (http://natura2000.eea.europa.eu), Ligularia sibirica is a species of community importanceÂ reportedÂ fromÂ 32Â NaturaÂ 2000Â SitesÂ fromÂ Romania, including our study protected area â€“ ROSCI0323 Ciucului Mountains. In the study area we identified a large number of well-developed populations with large number of individuals but varies depending on the type of habitat and of the variation eco-pedo-climatic conditions.Â The populations of L. sibirica in this area are stable and well preserved. Following research in this area in the summer of 2019 found that: the soil humidity, nitrogen availability, temperature, and lighting are the ecological factors influencing the morphological features of L. sibirica populations.Â In the Salonca and Delnita basins this species grows in the following habitats: 3220 - Alpine rivers and the herbaceous vegetation along their banks, CLAS. PAL.: 24.221 şi 24.222; 7110*Â Active raised bogs, CLAS. PAL.: 51.1; 6430 - Hydrophilous tall-herb fringe communities of plains and of the montane to alpine levels, CLAS. PAL.: 37.7 şi 37.8; 6440 - Alluvial meadows of river valleys of the Cnidion dubii, CLAS. PAL.: 37.23; 6510 - Lowland hay meadows (Alopecurus pratensis, Sanguisorba officinalis)] CLAS. PAL.: 38.2; 91E0* - Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae), CLAS. PAL.: 44.3, 44.2 şi 44.13 and 9410 - Acidophilous Picea forests of the montane to alpine levels (Vaccinio-Piceetea), CLAS. PAL.: 42.21 up to 42.23, 42.25. (Mountford and Gafta, 2008; Niculescu, M., 2006.