13 Jahre nach dem Sturm – Vegetationsentwicklung im Buchen- Naturwald „Königsbuche“ (südwestliches Harzvorland, Niedersachsen)

摘要: Schmidt, W., Heinrichs, S.: 13 years after windthrow – Vegetation dynamics of the strict beech forest reserve “Konigsbuche” (southwestern Harz Mountain foothills, Lower Saxony). - Hercynia N. F. 45 (2012): 81 110. The was established in 1972. In 1997, parts old stand were destroyed by a local summer storm, which created disturbance gradient ranging from unaffected areas to smaller and extensively large gaps. After first inventory during 1998 2001, flora vegetation recorded again on permanent plots 2010 order understand plant succession regeneration unmanaged windthrown forests (Galio odorati-Fagetum) according initial intensity. species diversity higher compared year positively correlated with unthrown gap thrown stand. Contrasting three categories, light emerged as most important environmental factor explaining differences richness. comparison situation changes microclimate (temperature, water supply) seemed also be for composition. Furthermore, decomposition high amounts dead wood (mainly twigs brushwood), particularly plots, favored indicating nutrient supply these originally mesotrophic soils. Therefore, an Urtica-Rubus -stage has been short period, well characterised proportion both open sites. On contrary, stands gaps closed dominated together young fast secure natural community small-scale disturbance. However, current survey showed that is dominant regenerating tree overcrowding Urtica-Rubus-stage now. Pioneer ( Betula pendula , Salix caprea ) well-known managed acidic soils rarely “Konigsbuche”. With increasing intensity, however, shrub Crataegus monogyna Sambucus nigra S. racemosa some other deciduous Acer pseudoplatanus Carpinus betulus Prunus avium became more important. Nevertheless, can only survive sufficient under low roe deer browsing pressure shown comparing fenced unfenced plots. Key words: Strict reserve, plot, succession, intensity disturbance, windthrow, Galio-Fagetum, diversity, Ellenberg indicator value, regeneration,