Properties of Alluvial Soils of Taiga Forest under Anthropogenic Salinisation

The environmental impact of deposit development can be indirect and cause combined geochemical processes in ecosystems. These must taken into consideration under forecasting risk assessment. Soil degradation the Taiga Forest is considered, within area Verkhnekamskoye potash (Russia), as an example such transformation. Here, mechanism characteristics anthropogenic salinisation alluvial soils are newly described. It was found that there a strong industry on valley where contaminated Na-Cl groundwater discharges or close to surface. characterised by high salinity, sum toxic salts has reached 26%. Alluvial gley humic clay chloride saline soil (Gleyic Fluvisols (Salic, Loamic, Technic)) secondary solonchak sulphate-chloride gypsum-containing surface-gleyed (Chloridic Gleyic Fluvic Solonchak (Hypersalic, were formed hydromorphic conditions. Morphological, physicochemical mineralogical analyses carried out. Under conditions, Chloridic Loamic) described show hydrotroillite layer reddish-yellow iron-rich precipitates its top horizon highest content iron minerals (up 84.9%) Fe-bearing plant residues 20%). Additionally, spongy gel-like organic materials, well siliceous remains diatoms, enriched Ca, Fe, Cl, K, Na, S P. lower consists black phases hydrogen sulphide settings with residues. insoluble part samples contains up 84% hydrogoethite. sources bottom sediments include iron-enriched Sheshma speckled rocks, slurry material, halite wastes soils.