Spätglaziale Umweltverhältnisse im Südschwarzwald: Erste Ergebnisse paläolimnologischer und paläoökologischer Untersuchungen an Seesedimenten des Hirschenmoores

Abstract

Late-glacial environment in the southern Black Forest: First results of paleolimnological and paleoecological studies on lake sediments of the Hirschenmoor. A Late-Glacial limnic sediment core from Hirschenmoor, southern Black Forest (FRG), has been analyzed for pollen, diatoms and geochemistry. The profile includes part of the Bölling, the Alleröd, and part of the Younger Dryas. The investigation allowed a reconstruction of the Late-Glacial environments at the site. The development of the terrestrial vegetation went from a sparse birch forest to a more dense pine-birch forest which was eventually partially cleared during the climatic cooling of the Younger Dryas. The lake was colonized by oligothrophic aquatics as well as by alkaliphilous and circumneutral diatoms, Chrysophytes and Chlorophytes. The tephra of Laach has been well evidenced stratigraphically and geochemically, However, its actual stratigraphic position does not correspond to the time of its deposition. A slight decrease of the diatom-inferred pH-values after the deposition of the tephra-layer was observed. Its cause may either be linked to the volcano eruption or to pedogenesis. The climatic cooling of the Younger Dryas is well evidenced by all investigated parameters.