Fractionation of manganese compounds in the topsoil layer affected by coal waste heap (Central Russian Forest-Steppe)статьяПереводИсследовательская статья
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Аннотация:The electrical conductivity of the water extract, particle-size distribution, pH, total organic carbon content, and three mobile fractions (exchangeable, complexed, and specifically adsorbed) of manganese were studied to analyze the metal fractionation in the soils affected by acid mine drainage at 11 sites (57 samples in total). Clay loamy Technosols (Technolithostrates) of a bare surface of the coal waste heap with predominating very acid reaction (pH 3.7) are often characterized by sulfate salinity. The electrical conductivity of the water extract (1 : 5) reaches 2 dS/m. Acid sulfate water and solid matter from the spoil heap form toeslope talus, which bury highly productive Chernozems and Phaeozems. The mobility of manganese assessed as the percent of three mobile fractions in the total Mn content was equal to 2–4% in the most toxic bare substrate. In the grass-covered toxic substrate (Regosol over Phaeozem) and buried AUx horizon of Chernozem, it was 20–40%. In the AU horizon of unpolluted Chernozem, it achieved 100%. In terms of the fractional composition of Mn compounds, the bare soils on talus are close to the toxic substrates of spoil heaps, while the grasscovered toeslope talus soils are similar to the unpolluted Chernozems. It is supposed that vegetation contributes to a reliably higher content of mobile Mn compounds. Sulfuric solutions entering the AUx horizon of Chernozems decrease the total content of Mn and its mobile compounds in the soil.
