C - Lublin

the depth only 25 cm. It should be noted, that sulphate content in this horizon
grown to about 2000 ppm. The complex of such soil properties indicates extremely
drought conditions existed at the turn of the 3-d and 2-d Millennium BC.
2.5
2
1.5
1
0.5
%
Easily soluble salts
Gypsum
0
BP
5100±50 4410±100 4260±120 4120±70 3960±40 Present time
Fig.2 The dynamics of easily soluble salts and gypsum contents in the profiles of
buried paleosoils and modern background soils
10
8
6
4
2
0
%
BP
5100±50 4410±100 4260±120 4120±70 3960±40 Present time
Fig. 3 The dynamics of carbonate contents in the layer of 0-50cm in paleosoils and
modern background soils
Thus, the soil data obtained allowed us to propose the following concept of the
climate development and soil forming conditions changes during the 3-d
Millennium BC. At the first part of the 3-d Millennium BC the climate in the area
under investigation was moderately dry, and the atmospheric precipitation was
close to than of the present. During the whole second part of the 3-d Millennium
BC the climate aridization was gradually increasing. The heaviest droughts
occurred at the turn of the third and second Millennium BC resulting in disastrous
wind erosions, increase of the concentration of water-soluble components (easily
soluble salts, gypsum, carbonates), and deflation of the upper horizon of the
watershed area soils.
Acknowledgements. This research was supported by the Russian Foundation for Basic
Research and the Program of Presidium of RAS for Basic Research (directive 4)
37