Abstract
A total of 112 samples of peat and 26 samples of soil water were collected from three key areas of Histosols within undisturbed taiga ecosystems of Western Siberia (Russia). Data on elemental composition of peat ash, soil water, soil extracts (three mobile fractions: weakly bound acid-soluble exchangeable compounds, bound with complexes, and specifically absorbed) were obtained by methods of inductive coupled plasma mass-spectrometry and X-Ray fluorescence spectrometry, respectively. The soil waters had pH values from 3.1 to 4.4 and electrical conductivity from 22 to 130 µS cm-1. Element concentrations in soil waters formed the following decreasing sequence: Ca, Si > K, Mg, Fe, Na, Al >> Mn, Sr, Zn > Ni, Cu > Pb, Co, As, which differs from the sequence of elements arranged according to the content in peat and three studied mobile fractions. The influence of the elemental composition of peat on the composition of soil waters studied is insignificant. From the northern to the southern key areas, there were significant (p-value < 0.05) decreases in concentrations of As, Ba, Cd, Co, K, Mo, Mn, Ni, Pb, Rb, Sr, Si and V in soil waters, with insignificant differences in Al, Ca, Cr, Cu, Fe, Mg, Na, Ti and Zn.
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