Botanikai-Természetvédelmi Folyóirat

Journal of Pannonian Botany

Kitaibelia vol. 10 – no. 1. (2005) p.104-114.

A nagybárkányi Nádas-tó kialakulása a makrofosszília vizsgálatok alapján (Cserhát, Észak-Magyarország)
Jakab Gusztáv – Sümegi Pál
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The Nádas Lake (.the peat bog of the Cserhát Mts.) is situated at the vicinity of Nagybárkány village, N Hungary. The formation of the lake is dated back to the Late Glacial. Up to the Atlantic chronozone high water levels and low vegetation cover with reed swamp detected. After that more than 4400 years of sediment missing (hiatus). The sediment has been excavated in the Celtic Period (aprox. 330 BC). We could reveal some connection between the fluctuations in the trophic conditions and the historically recorded climatic phases (Roman Warm Period, Dark Ages Cold Period, Medieval Warm Period). The formation of Sphagnum-dominated peatbog started at the end of the Árpáds Period (aprox. 1400 AD) with the formation of floating Typha angustifolia mat. This association later succeded by Phragmitetum communis thelypteridetosum, Phragmiti communis-Sphagnetum and at last Salici cinereae-Sphagnetum.