A Late Glacial and early Holocene profile from Jaslo and a recapitulation of the studies on the vegetational history of the Jaslo - Sanok depression in the last 13 000 years

Abstract

This work is a continuation of the studies started earlier by the author in the Jaslo-Sanok Depres­ sion in which the palynology and the macrofossils were analysed. The first part of this paper gives a discussion of the changes in the vegetation on the basis of the profile from J aslo and the reconstruction of the vegetational history from the Oldest Dryas to the Boreal. A recapitulation of the studies on the vegetational history of the Jaslo-Sanok Depression in the last 13 000 years based on four examined profiles (Jaslo, Roztoki a and b, Tarnowiec) is the essential part of the paper. The correspondence analysis shows the relationship between particular samples of the four profiles covering a period from the Older Dryas to the Boreal. Despite some inevitable local differences between the profiles they show a resemblance and, what follows, it has been pointed out statistically that the features characterizing the profiles of the Jaslo-Sanok Depression are common to the four diagrams analysed. The following characteristic features can be listed for the profiles analysed: The Late Glacial supported the survival of some trees present in a park-woodland landscape. The diagrams are conspicuous by very high per­ centages of birch trees. The region of the J aslo-Sanok Depression may have been a refugium of spruce. The rapid spread of alder in the Jaslo-Sanok Depression, appears to be responsible for the remarkable shortening of the part of the profile corresponding to the Atlantic and even the hiatuses in the deposits. The particularly favourite climatic and edaphic conditions caused an early and intense - in comparison with other regions of the Carpat­ hians - penetration of the area by man.