| Popis: |
The glacial periods with numerous successive climatic oscillations and simultaneously with major changes at the ecological level have determined over time the migration of a significant number of species in search for optimal survival conditions. Through these species it can be found the subject of the present paper, Ligularia sibirica (L.) Cass. The aim of this paper is to present the species of community importance Ligularia sibirica (L.) Cass. integrated in two vegetal associations from Romania, within the Bucegi Natural Park in Zănoagei Gorges: Ligulario sibiricae - Ribetum petraei Neblea et Alexiu 2003 and Asperulo capitatae - Seslerietum rigidae (Zólyomi1939) Coldea (1991). The purpose of this paper is the comparative study of the two associations from the biodiversity, taxonomy, bioforms and geoelements point of view and their analysis in terms of genetic structure. The Ellenberg index analysis complements this study, with a significant detail of the ecological structural evolution in time on the studied populations. Analysis of the Ellenberg indices includes factors such as light, temperature, humidity, soil reaction and nitrogen content. The work also includes an analysis of the conservation and biodiversity status offered by the two studied associations in which Ligularia sibirica (L.) Cass. relict species is part of. In order to highlight the biodiversity degree, the number of the existing individuals in each association will be specified as well as the phenological condition from the moment of study. |
