Lateral differentiation of metal fractions in loamy soil catenas of the central part of Western Siberia plain

Lateral fractionation of Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr and Zn compounds (recovered by acetate ammonium buffer (AAc), ЛЛс+1% EDTA and 1n HNO₃) in soils of loamy catenas was studied within three small catchments in the southern taiga, subboreal forests, and forest-steppe of Western Siberia. The total concentrations of Mn (mean value and standard deviation in the A-horizon of soils within the three catchments is 2442±3359 mg/kg), Sr (179±71), Co (20±10), Cu (42±18), Ni (48±35) and Pb (41±51) correspond to their background levels in soils of Western Siberia, while those of Fe (3,7±0,9%), Cr (170±34 mg/kg) and Zn (154±141 mg/kg) are higher because of their higher concentrations in parent material. The average content of exchangeable compounds of Fe, Cu, Pb, Co, Zn, Cr, Mn, Ni and Sr in top-soil and sub-soil horizons increases from taiga Luvisols and Gleysols to Phaeozems, Planosols and Chernozems of subboreal forests and forest-steppe. In the A-horizon of this series the content of complexed Cu, Co, Ni, Pb and Fe increases due to higher concentration of organic matter and that of Mn decreases, because it is intensively accumulated by tree vegetation. Specific zonal features of sorbed Co, Cr, Cu, Fe, Ni, Pb, Sr, and Zn were not found.

The mobility of Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr, and Zn in O-layer decreases 2 to 3 times from Luvisols to Gleysols withinn taiga catenas in proportion to the amount of complexed compounds. In subboreal forest catenas with Phaeozems, it decreases with depth for Ni (40 to 15%), Pb (45-40), Cu (2415), Co (15-11), and Fe (5-2); slightly varies for Mn and Zn (60 to 50% and 10 to 9%, respectively) and increases for Sr (10 to 14%) and Cr (5 to 7%). In Planosols, these tendencies are valid for Co, Cu, Fe, and Ni. In forest-steppe catenae with Chernozems, the mobility decreases with depth for Co, Mn (95-56%), Ni and Pb (60-25%) and increases for Sr (37-46%), varying slightly for Cu (40-50), Zn (10-13), Fe (7-8), and Cr (4). In Planosols, these trends are valid for Co, Mn, Ni, Pb, and Cr. The total frequency of lateral fractionation coefficient values corresponding to contrast accumulation and contrast scattering of elements in subordinate landscapes decreases from 35±14% in the taiga catchment to 15±4% and 13±7% in the subbpreal forest and forest-steppe catchments respectively.

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