Zs. K. Komáromy szerk.: Studia Botanica Hungarica 17. 1984 (Budapest, 1984)
Szujkó-Lacza, Júlia: The flora of the Kerecsendi berek forest
In the wider part of the main road of the Aceri tatarico-Quercetum exists a steppe spot (cf. SZUJKÓ-LACZA & RAJCZY I.e.). Here occur the Pannonian-Balkanian Dianthus giganteiformis, the Collin- Montane Festuca pseudodalmatica , the Eurasian Festuca rupicola , the Ponto-Mediterranean -Central European Galium glaucum , the Ponto-Pannonian Salvia nutans (ZÓLYOMI!), the European-Siberian Melampyrum cristatum, the Eurasian Phlomis tuberosa , the sub-Mediterranean (Balkanian-Pannonian) Seseli pallassii , the Ponto-Mediterranean Stachys recta , the Central-Southeast European Veronica austraiaca ssp. austriaca . In the Fraxino pannonicae-Ulmetum community occur interest species such as the South-East European Fraxinus angustifolia , the Eurasian (Mediterranean) Veronica hedrifolia ssp. triloba , the Continental Gagea minima . The Polygonato (latifoliae)-Carpinetum are fragmentarily represented here and the CentralEuropean Mediterranean Tilia platyphyllos and the Cephalanthera damasonium lend unique character to it according to floral elements. There are present 41 different flora elements (= type of plant geographical area). It is the wealth of these elements that the flora and vegetation of Kerecsendi berek forest are of such scientific interest. Beside this, conspicuous is the extremley high number of woody species in the tree and shrub layers belonging to the life-form categories MM-, M- and N (Table 3). The geophytes also play an important role here including four (five) taxa from Muscari and the very frequent Corydalis cava . Relatively high is the number of therophyton species and transient froms of these (Table 3). The diversity of the species according to microhabitat, life-form and plant geographical areal type is higher in microhabitats and less in life-form (though the number of categories are different!). On the contrary, evenness value (J) is higher in life-form and less in floral element Table 4). Table 4. Results of the flora analysis according to microhabitats, life-forms and the type of floral elements, e.g. the areal type Microhabitat Life -form Areal type H*= 4.2059 H' = 2.5891 H'= 4.0534 J = 0.8411 J = 0.9222 J = 0.8260 N = 349 N = 342 N = 336 S = 32 S = 7 S = 30 Out of the species present there are 37 % polyploid species, 2-3 % unidentified and 60 % diploid. SUMMARY The Kerecsendi berek forest and area in its vicinity is rich in vascular plant taxa, luxuriant in woody species belonging to the MM-M to the N types of life-forms in the trees- and shub layers, e.g. Acer and Quercus taxa, three of the Cornus including C. sanguinea ssp. hungarica ect. The trees and shrubs were removed from the roads of the Kerecsendi berek forest over four hundred years ago. Since this time these roads have been "open" for the introduction of steppe and forest-steppe species which had previously grown near to the forest. In the Salvio-Festucetum, the roads and at the margin of the Aceri tatarico-Quercetum 99 species occur out of the 342 taxa (Table 1). Consequently, the variation and combination of the various floral elements are the greatest in these three microhabitats. The nitrophilous species grouped mainly in the Fraxino pannonicae-Ulmetum, some of there are weed taxa. But the truly ruderal composition is characteristic for the planted Robinetum part of the forest. Polygonato (latifoliae)-Carpinetum is in a deep valley where the herb layer is overshaded. Minimal number of the occurring species in this community may be connected with its fragmentary size and the poorly illuminated environmental condition. Aceri tatarico-Quercetum has greater number of "unique" than Salvio-Festucetum (Table 1).
