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Flora of the order Quercetalia pubescentis Br.-Bl. (1931) 1932 in the forest vegetation of the Požega hill area (NE Croatia)

This paper is a part of systematic synecological-vegetational research into the forest vegetation of the Slavonian hill area, an exceptionally valuable site in the vegetation picture of the Republic of Croatia. Particular attention was paid to the presence of the species of the order Quercetalia pubescentis in the forest vegetation owing to the fact that they are a special and rare feature in continental forest ecosystems. A total of 123 relevés encompassing 12 forest communities were analysed. The analysis of the floral composition of forest communities of Požega hill area revealed as many as 213 species, of which 31 or 14.5 % belong to the order Quercetalia pubescentis in a sociological sense. The species from the order Quercetalia pubescentis encompass the warmest, southern, south-eastern and south-western positions in the upper parts of the slopes, the flat tops of ridges and crests, as well as the stands with more light and drier conditions. In terms of physiognomy and sociology, the species of the order Quercetalia pubescentis give the most distinct characteristic to the community Lathyro-Quercetum petraeae. The number of the species of the order Quercetalia pubescentis decreases considerably going from the west eastwards with the exception of Požega hill area. A comparison of the species occurring in certain areas shows that the western part differs from the eastern part to which the hills of Požega belong. The spectrum of biological forms and the spectrum of floral geoelements were determined for each community. The results of research broaden the perception of the number, distribution and importance of the species of the Quercetalia pubescentis order in the forest ecosystems of hills in the Pannonian plain.

forest; vegetation; flora; synecology; Quercetalia pubescentis; Požega; Croatia

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