B. Papp szerk.: Studia Botanica Hungarica 38. 2007 (Budapest, 2007)

Szollát, György, Seregélyes, Tibor, S. Csomós, Ágnes; Standovár, Tibor: The flora and vegetation of Gödi Láprét near Göd, Pest county, Hungary

TUTIN et al. (1980). The nomenclature of phytosociological units follows BORHIDI (2003) and that of the vegetation units DEVILLERS et al. (2000). The phytosociological assessment of species follows the works of Soó and Borhidi published in FLÓRA database 1.2 (HORVÁTH et al. 1995), while the data in BORHIDI (1993) and of KOVÁCS (1962) were also taken into consideration. To assess the naturalness/degradation status of vegetation we used the revised scale devised by Németh and Seregélyes (BÖLÖNI et al. 2003). RESULTS Of the Praematricum (Duna-Tisza köze) floristical district's natural closed and open sandy grassland vegetation developed on calcareous, loose sandy soils on the low sand hills, our survey area possesses closed (or disturbed, thus open) sandy grasslands, and patches of edaphic vegetation of inter-dune depressions. The vegetation types of the Gödi Láprét in details are as follows: 1) closed sand meadow-steppe, 2) fragments of open calciphilous sand steppes, 3) more or less degraded sandy grasslands (like open sand steppes, sandy pastures in response to disturbance, and a certain variety of sand steppes with Centaurea sadleriana, not recognised and described as a plant community yet). At lower elevations there are 4) reed beds, 5) large sedge beds, 6) rich fens, 7) purple moorgrass meadows and 8) fragments of grey willow scrub. In the border zone of the purple moorgrass meadows and sand meadow-steppes a transitional vegetation type evolved containing various plant compositions of wider or narrower extension depending on the surface gradient. Similar zones with transitional vegetation do also occur on flat places with sinking water table and quickly drying soil. Among the most remarkable botanical values of the Gödi Láprét nature conservation area are, even at national level, the black bog-rush and blunt-flowered rush fens (including fragments of the davall sedge and tawny sedge fen fragments), and the purple moorgrass meadows. Beds of these plant communities are diminishing in the whole country, while such habitats are also rather rare in Middle Europe. These vegetation units in our survey area are apparently undisturbed and seem especially valuable for their relatively high species diversity. The number of protected species in the fens is relatively low (12 spp.), but of most species the population size is rather large. Of all protected species (35 spp.) occurring in the area (including