L. Lőkös szerk.: Studia Botanica Hungarica 27-28. 1996-97 (Budapest, 1978)

Nagy, János, Figeczky, Gábor, Penksza, Károly, Fintha, István, Molnár, Attila, Tóth, Zoltán; Kalapos, Tibor: Contributions to the flora and vegetation of the Lake Bence-tó, NE Hungary

zony hill) near Barabás were published by BARTHA and GENCSI (1991), on the vegetation of the Ecsedi-láp (Ecsed marsh) and the relicts of the Great Plain and other floristic data by BOROS (1938, 1954, 1962), on the geomorphology and the evolution of the water system of the Szatmár-Bereg Plain by BORSY (1954, 1959), on the region's biogeography by DÉVAI and FlNTHA (1968), on the changes in the vegetation of the plains during the past centuries and the current reconstructional processes by FlNTHA (1976), on the pollen records of the bog at Csaroda by CSINÁDY ( 1959), on the mountain elements of the flora and vegetation of the northern Great Plain by SIMON (1950, 1952, 1954, 1985&), and on the northern habitats of Crocus heuffelianus by SIMON and MOLNÁR (1972). Floristic data on the Bereg Plain were presented by FlNTHA (1984), HUSÁK and OTAHELOVÁ (1982), KEVEY (1978), KOVÁCS and PRISZTER (1977), KULCSÁR (1952) and MÁTHÉ (1959), SIMON (1965b), SOÓ (1937, 1939, 1947, 1948, 1964-80, 1965); SOÓ and MÁTHÉ (1959), SOÓ and BORSOS (1957) and THAISZ (1911). Until now, only one study (FlNTHA 1994) was published on the lake Bence-tó. Our paper presents the detailed vegetation map of the lake Bence-tó and the plant associations encountered here. MATERIALS AND METHODS The authors have been conducting field work in the area since 1990. This study is a summary of their work. Sample plots for the study of the vegetation were set up such in a way that most plant associations could be sampled. Coenological relevés were made at 7 different sites of the lake Bence-tó. 1) The first sampling site consists of 12 plots arranged in three transects running parallel to each other in a NE-SW direction. Each transect includes four 5 m X 5 m plots in a tall segde community at the NE part of the lake. The easternmost plot is labelled as 1/1 and the westernmost as 3/4. 2) The second group of sample plots is close to the above site, at the southeastern end of the willow marsh, where peat mosses do not occur. Four adjacent 5 m X 5 m size plots were set up, the sides of the obtained 10 m x 10 m square are directed toward NW-SE and SW-NE. 3) The third sampling site is in the peat bog, where instead of plots 25 permanent Sphagnum cushions were studied. 4) The fourth site is at the deepest part of the lake, covered by water for the longest time. Here 18 adjacent plots form a transect perpendicular to the edge of the lake. Plot 1 is at the most southern, plot 18 is at the most northern side of the lake. The sizes of the plots are: 1.-2.: 5 m x 5 m; 2.-18.: 2 m x 2 m.