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