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• Floristic and vegetation change on the Sphagnum-dominated mire of Egerbakta

  129–138

  János György Nagy

  János András Dudás

  Dániel Töpler

  Júlia Hoblyák

  Views:

  149

  Since 1988, open stands of Menyanthes trifoliata have disappeared, communities of Carex rostrata have declined, and the Sphagnum-dominated willow carr has expanded. The mire’s central asso­ciations include Caricetum rostratae, Salici cinereae–Sphagnetum recurvi sphagnetosum squar­rosi, and Calamagrosti–Salicetum cinereae. In the mainly nudum lagg zone, the following communities occur: Biden­ti–Polygonetum hydropiperis, Bidenti–Polygonetum hydropiperis urticetosum dioicae, Cari­cetum acutifor­mis, Juncetum effusi, Glycerietum maximae, and a community dominated by Poa nemora­lis. We recorded 77 vascular plant species, 62 of which were new to the site. Rare species have declined in number: Menyant­hes trifoliata and Cicuta virosa are now absent, and of the former eight Sphagnum species, only Sphagnum squarrosum remains. The original Salici cinereae–Sphagnetum recurvi sphagne­tosum recurvi subassociati­on transitioned into Salici cinereae–Sphagnetum recurvi sphagnetosum squar­rosi after the mire remained completely dry and peat-moss-free for several years around 2000. Central communities reflect a cool, moderately acidic, oligotrophic environment with low pH and conductivity. In contrast, lagg vegetation indicates warmer, nutrient-rich, less acidic conditions. The mire’s most valuable zone is its central, Sphag­num-rich area, whose preservation depends on a natural water supply maintained by continuous forest cover in the catchment and stable or reduced large game populations.

• Temperature and soil moisture regimes of the forested and non-forested dolines of the Bükk Mountains based on ecological indicator values

  331-338

  Zoltán Bátori

  Anna E. Vojtkó

  László Erdős

  András Vojtkó

  Views:

  294

  In the study we aimed to investigate whether there are differences in the ecological conditions of the forested and non-forested dolines of the Bükk Mountains (northern Hungary). Transects for sampling the herb layer were established across three forested and three non-forested dolines in a north to south direction, traversing the deepest point of the dolines. Presence-absence data of each vascular herb and tree sapling were recorded in the plots. Borhidi’s indicator values for temperature (TB) and soil moisture (WB) were used to compare the ecological conditions along the slopes. Our results showed that there were remarkable differences between the temperature and moisture regimes of the forested and non-forested dolines. Both the temperature and moisture gradients were more pronounced along the slopes of the non-forested dolines than along the forested ones. These are due to the fact that forest cover together with the features of the regional climate of the area has a considerable mitigating effect both on the air temperature and soil moisture regimes of dolines.