Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 89. (Budapest 1997)

Szollát, Gy., Stollmayer-Boncz, E. , Standovár, T. ; Kecskés, F.: Vegetation of the Réti-dűlő and Csömöri-tó (Hungary)

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICI Volume 89. Budapest, 1997 pp. 71-91. Vegetation of the Réti-dűlő and Csömöri-tó (Hungary) GY. SZOLLÁT

1

, E. STOLLMAYER-BONCZ

1

, T. STANDOVÁR

2 and F. KECSKÉS

3 ^Department of Botany, Hungarian Natural History Museum H1087 Budapest, Könyves Kálmán krt. 40, Hungary Department of Plant Taxonomy & Ecology, L. Eötvös University H-1083 Budapest, Ludovika tér 2, Hungary " 1223 Budapest, Kőbányai u. 11-13, Hungary SZOLLÁT, GY., STOLLMAYER-BONCZ, E., STANDOVÁR, T. & KECSKÉS, F. (1997): Vegetation of the Réti-dűlő and Csömöri-tó (Hungary). - Annls hist.-nat. Mus. natn. hung. 89: 71-91. Abstract - This paper presents the results of vegetation studies that have been carried out in the past 15 years in this small, but valuable area near Csömör. Detailed floristic survey showed that there are 7 protected and 5 rare species among the 274 vascular species. Important vegetation types of the are include mire willow scrub, reed and sedge swamps, and meadows of varying water supply. A vegetation map of the are was also prepared. The most valuable communities were studied in more detail, i.e. their phytosociological analyses were also completed. Some remarks on necessary conservation measures are also presented. With 3 figures and 7 tables. INTRODUCTION Réti-dűlő and Csömöri-tó are two valuable natural areas in the neighbourhood of Csömör (Pest county, Hungary). They have been under protection according to the Nature Conservation Act since 1977 under the name of "Csömöri legelő". The main part of the protected area is the narrow band along the Csömör Creek covered by mire willow scrub, reed or sedge swamps, or by meadows of varying water supply. Csömöri-tó is located a bit farther from the creek, from which its water supply is independent. Nowadays it is covered by reed swamp (cf. STOLLMAYER-BONCZ 1982, 1993A, b). Intensive vegetation survey has started in the early 1980's. Data on the vascular and algal floras, as well as on vegetation changes have accumulated during the past 15 years (STOLLMAYER-BONCZ 1982, 1988, 1991a, b, 1992, 1993a, b). As part of the preliminary works for establishing the Danube-Ipoly National Park, the vegetation map of the Rétidűlő was prepared in 1994 together with the distribution map and population size estimation of protected species. A detailed assessment of the status from a conservational viewpoint was also given (STANDOVÁR & SZOLLÁT 1995). These data were appended by the phytosociological samples that were collected from the most valuable parts (former and present) of the area (sedge tuft, drying fen, Csömöri-tó).