Pakhorukov I.V., Eremchenko O.Z.

Dynamics of acid-base and redox conditions in alluvial technogenically saline soils of the taiga forest zone

The alluvial technogenically saline soils on the territory of the Verkhnekamsk salt deposit in the Perm Region were examined. It was found that in the studied part of the valleys of small rivers, alluvial saline soils occupy tens of hectares. During the summer-autumn observation period in alluvial humus gley saline saturated soil (Gleyic Fluvisol (Loamic, Salic)) at a depth of 10-40 cm, reducing conditions prevailed (Eh from +200 mV to -250 mV), favoring the biochemical recovery of iron and sulfur. The reaction of the soil medium ranged from 6,5–7,8 pH. In alluvial gley salt marsh unsaturated soils during the summer-autumn period in a layer of 10-40 cm, an alternation of anaerobic and aerobic conditions (Eh from -50 mV to +550 mV) was noted; the reaction of the soil medium at a depth of about 10-20 cm ranged from 2,5–4,1 pH. The regression dependence of pH on the value of Eh has been established with a correlation coefficient of R = -0,84. Apparently, technogenically saline alluvial soils have the potential for the formation of sulfide compounds and their subsequent oxidation with the appearance of a sharp acid reaction of the soil medium.

Keywords: TECHNOGENIC SALINIZATION, EH, PH, GLEYIC FLUVISOL (LOAMIC, SALIC)