Marisia - Maros Megyei Múzeum Évkönyve 36/1. (2016)
Botany
Phytosociological study ofLigularia sibirica (L.) Cass, habitats from Zänoagei Gorges (Bucegi Mountains), Romania Regarding the requirements to temperature, within the association prevails the widespread species in the montane and high montane levels (T4 = 40.9%), followed by the eurithermal species (Tx = 29.09%) (Fig. 5). In terms of humidity conditions required for the well development of plant association species, it can be noticed that the dominant species are the meso-hygrophilic ones (U5 = 33.63%), wich prefers the moderate moist soils and are followed by species integrated in meso-hygrophilic — hygrophilic category (U6 = 27.27%). (Fig. 5). Reported to the tolerance of species to the soil reaction, an important category in the studied association is occupied by species that prefers moderate acid soils or neutral to basic soils (R5 = 28.18%), being followd by species that prefers moderate acid and acid soils (R4 = 18.18%), also a significant share is occupied by the euriionic species (R = 25.45%) (Fig. 5). The species distribution regarding the amount of nitrogen in soil within the association, species that prefers soils with moderate to high content in N mineral are significant (Nfi =15.45%), although the biggest percentage is held by eurinitrophile species. (N = 30%) (Fig. 5). Conclusions In the association Cirsio waldsteinii-Heracleetum transsilvanici Pawl, et Walas 1949, it can be observed a high degree of biodiversity, due to the large number of species included in 45 families, mostly in the Asteraceae family. Bioforms spectrum reveals the high percentage of hemicryptophytes. The analysis of the geoelements showed that the Eurasian and European elements are highly predominant. From the karyologycal point of view, was noted that in the studied association both polyploides and diploides species had a high share. This reveals that with the climate changes, the biodiversity of the mentioned association may be reduced, due to their low diploid species adaptability to the new environmental conditions. After analyzing the Ellenberg indices on the studied area, the light tolerant species are predominant being widespread in the montane and high montane floor, along with meso-higrophilic species on the moderate or low acid soils but also on neutral ones, with requirements for a moderate to high mineral nitrogen content. REFERENCES 1. Brinzan, T. (eds.), Bädäräu, A.S., Murariu, D., Staicu, C., Patriche, N., Ciubuc, C., Hulea, D., 2013, Catalogul habitatelor, speciilor si siturilor Natura 2000 in Romania. Edit. Fundatia Centrul National pentru Dezvoltare Durabilä, Bucuresti. 2. Bilz, M., Kell, S.P., Maxted, N., Lansdown, R.V., 2011, European Red List of Vascular Plants, Luxembourg: Publications Office of the European Union: 101 pp. 3. Chater, A.O., 1976, Ligularia Cass. In: Tutin, T.G., Heywood, V.H., Burges, N.A., Valentine, D.H. (Eds.), Flora Europaea, (V. Plantigenaceae to Compositae (and Rubiaceae). Cambrige University Press, UK, 205 pp. 4. Ciocárlan, V., 2009, Flora Ilustratä a Romäniei. Pteridophyra et Spermatophyta Edit. Ceres Bucuresti. 5. Coidea, Gh., 1997, Les associations vegetales de Roumanie. Les associations herbacees naturelles, Tome 1, Edit. Universitaires de Cluj, Cluj Napoca: 126—133 pp. 6. Ellenberg, H., 1974, Lndicator values of vascular plants in Central Europe, Scripta Geobotanica, 9, Verlag Erich Goltze KG, Göttingen. 7. Ellenberg, H., 2009, Vegetation Ecology of Central Europe, 4th edition, Translated by Gordon K. Strutt, Cambrige University Press. 8. Gafta, D., Mountford, O. (coord.), Alexiu, V, Anastasiu, Paulina, Barbos, M., Burescu, R, Coidea, Gh., Drägulescu, C., Fagaras, M., Goia, I., Groza, Gh., Micu, D., Miháilescu, S„ Moldovan, O., Nicolin, A., 57
