Marisia - Maros Megyei Múzeum Évkönyve 35/2. (2015)
Botany
The lilac forest from Ponoarele. Phytosociologic considerations Once the tertiary climate cooled down, the lilac forest area had been gradually limited in South-East Europe. During the glacial times, the area of this species had been pushed more and more towards the South, where it survived until this day within its Balkan haven that had been left out of the glacial climate’s influence. The pre-glacial origins of the lilac coenoses from the Balkan resorts remain beyond any doubt [10]. “§ibliacurile” from Danube Defile, which represent continental xerotherme forests and prolonged bush ecosystems from the center and East of Balkan Peninsula (Moesicum), have been welcomed in the Syringo-Carpinion orientalis Jakucs alliance 1959. It is still difficult to distinguish the secondary “§ibliacuri”, developed as a consequence of the deforestation of the primary ones, which can be found on the chalk steep surfaces maintained young through neotectonic processes[8]. The similarities of the “§ibliacuri” from Danube Defile and the ones that R. Knapp (1944) studied on Valea Timokului confirm the syngenetic bonds of these “§ibliacuri” and also show the seniority of the clusters emerged during interglaciar xerotherme periods of [4]. The most obvious coenologice afinities of ass. Syringo-Fraxinetum orni (Ponoarele) can be seen with ass. Asplenio-Syringetum, which possesses less representative fragments that are noticed within the analyzed clusters, blossoming through the deep cliffs. Within its structure, ass. Syringo-Fraxinetum orni stays definite from ass. Asplenio-Syringetum, which usually colonizes the steep, rocky walls. The syngenetic bonds of the 2 associations stay obvious [9]. The thermal features of the chalk substrate, on which the most Northern lilac population grows, can be found in our country militating for their relictar, even preglacial, character. The ecologic conditions of the Ponoarele station, sheltered by Mehedinp ridges against the cold winds during glacial periods of time, could have been ideal for the survival of a lilac population from the preglacial periods, or even from the end of the tertiary. REFERENCES 1. Borza, A., 1931, Die Vegetation und Flora Rumäniens, Guide de la sixieme Excursion Phytogéographique Internationale, Roumanie, Cluj-Napoca: 1—55. 2. Borza, A., 1957, Caracterul p arondarea geobotanicá a vegetafiei lemnoase din regiunile de cámpie subcarpaticä, Bui. §tiinp Seep Biol, pi §tiinp Agric., Ser. bot., 9: 195—204. 3. Borza, A., Boncain, N., 1965, Introducere in studiul covorului vegetal, Editura Academiei R.P.R., Bucurepi. 4. Bopaiu, N., Lup$a, V., Resmerifä, I., Coidea, G., Schneider, E., 1971, Vegetapa lemnoasä mezo-xerotermä (Orno-Cotinetalia) din Defileul Dunärii, Ocrotirea Naturii, 15(1), Bucurepi: 49—55. 5. Grebenscikov, O., 1963, О rasprostranenii sireni obiknovennoi i sirenevih nizkolessii v iugo-vostocinoi Evrope, Biull. Mosk. obs-tvo isp. prirodi otd. biologhii, LXVIII, 1. 6. Knapp, R., 1944, Vegetationsstudien in Serbien, Vervielfältigung, 38 S, Halle. 7. Lascu, C., 1982, Drume\indprin Mun\ii Mehedin\iului, Editura Sport-Turism, p. 16, Bucurepi. 8. Matacä, S. £., 2005, Parcul Natural Por\ile de Fier. Flora, vegetapie §i proteepia naturii, Editura Universitaria Craiova, DrobetaTurnu Severin: 458-463. 9. Mägälie, E., 1970, Pädurea de liliac de la Ponoare, Ocrotirea Naturii, 14(2): 181—186, Bucurepi. 10. Scharfetter, R., 1953, Biographien von Pflanzensippen, Viena. PÄDUREA DE LILIAC DE LA PONOARELE. CONSIDERAJII FITOSOCIOLOGICE (Rezumat) Lucrarea analizeazä similaritäple dintre asociapile Syringo-Fraxinetum orni (Ponoarele) si Syringo- Carpinetum orientalis (Defileul Dunärii) din punct de vedere a compozipei floristice, bioformelor, geoelementelor, preferinfelor ecologice a speciilor componente si cariologic. 33
