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

6) The sixth group of plots is situated between the fifth and the seventh sites. It is a transect along the whole width of the lake directed NE-SW, consisting of 33 plots. The sizes of the plots are: 3.-23. and 27.-33.: 2 m x 2 m; 1.-2. and 24.-26: 5 m x 5 m. Plot 1 is at the northwestern shore of the lake. 7) The seventh sampling area is in the northwestern third of the lake, close to the road leading to the lake from Csaroda. 2x3 adjacent, 2 m x 2 m plots were marked here. The 6 m long side is directed NNE-SSW, the 4 m long is ESEWNW. For the permanent plots, total percentage cover and percentage cover for each species were estimated. The species were identified by using SIMON (1992&). At the third sampling area the following data for the cushions were recorded: two characteristic, possibly perpendicular length and direction of the chosen Sphagnum cushions, the ratio of Sphagnum species to each other and to the vascular plants present on them. The vegetation map (Fig. 2) was drawn using aerial photographs (JAKUCS 1966, BAGI 1987, LESS et al. 1991) following a former vegetation map draft (TÓTH and KALAPOS 1993). This study deals only with plant associations found within the lake Bencetó. Other natural and anthropogenic areas nearby are not described, just marked on the map. Nomenclature of plant names follows SIMON (1992b), names of the associations are used according to BARTH A et al. (1995) and KOVÁCS (1995). Nature conservation values were used according to BORHIDI (1993). RESULTS The detailed vegetation map of the area has been prepared. Eleven phytocoenosis currently existing in the area are indicated on it (Fig. 2). With the help of former data (FlNTHA 1994, TÓTH and KALAPOS 1992, 1993) a list of species consisting of 130 plants was compiled. Twelve of these are protected. By 1995 18 species became extinct from the lake, 4 of these are protected. DISCUSSION Flora A total of 130 species have been recorded in the lake Bence-tó until now, 112 of these were found in 1995. Out of the remaining 18 species 6 plants are obligate hydrophytes (Lemna minor, Hydrocharis morsus-ranae, Salvinia natans,