On the geochemistry of soil humus horizon in North-East Estonia
2000
Petersell, V. | Mottus, V. (Geological Survey of Estonia, Tallinn (Estonia))
The paper is based on the data of geochemical mapping of the humus horizon of soil and geochemical monitoring of soil carried out in 1986-94. These data have been supplemented with results of later investigations. The authors describe the formation of parent rock of soil in NE Estonia and its major geochemical features. The main plant nutrient elements and those having a negative influence of plant growth and the development of animate nature in the case of their elevated concentration in soil are observed. Components are areal distribution of technogenous atmospheric pollution falling on the ground surface in NE Estonia are also dealt with. The chemical composition of the humus horizon of soil in NE Estonia is variable, the variation coefficient of several elements exceeding 100 per cent. The trends of lateral changes in the concentration of elements are accidental. Such heterogeneity is mainly due to great variability of parent rocks of soil. Glacial deposits formed from Proterozoic crystalline rocks of Fennoscandian origin, as well as the Vendian and Paleozoic sedimentary rocks, among the latter mineralised or ore-bearing varieties, Dictyonema shale and phosphorite. Mean concentrations of elements in the humus horizon of NE Estonian soils are close to the respective concentrations of the whole Estonian territory, but differ considerably from the mean concentrations of all continents
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