HEAVY METALS IN ECOSYSTEMS OF CRYOARID LANDSCAPES OF THE WESTERN TRANSBAIKALIA
Chimitdorzhieva G.D., Bodeeva E.A., Chimitdorzhieva E.O. HEAVY METALS IN ECOSYSTEMS OF CRYOARID LANDSCAPES OF THE WESTERN TRANSBAIKALIA // Arid ecosystems. 2022. V.28. № 2 (91). P. 62-70. | PDF
The results of experimental work on the study of the transformation flux of heavy metals: copper, zinc, nickel and lead from parent rocks into chestnut soils, then into virgin grass stand and humic substances are presented. The soil-forming rocks are deluvial and deluvial-proluvial deposits, as well as deposits of sands and pebbles, which, as a result of their weathering, movement and redeposition, determine the unequal granulometric, mineralogical and chemical composition of rocks, affecting the composition of the soil cover. Chestnut soils are characterized by an arid climate, a long stay in a frozen state, low bioproductivity, low power, light particle size distribution, and low humus content. For the extraction of humic substances, the Grimme method was used. The determination of the content of trace elements was carried out by the atomic absorption method with direct electrothermal atomization of samples. Heavy metals were determined on an atomic absorption spectrophotometer – AAS-15 Perkin Elmer. It was revealed that, due to the depletion of rocks in copper and nickel, there are few of them in the soils, and there is more zinc and lead, which, respectively, is reflected in the vegetation and humus.
Keywords: heavy metals, humic substances, parent rocks, vegetation, chestnut soils, Western Transbaikalia.
Financing. The work was carried out on the topic of state task No. 121030100228-4 «Evolutionary-genetic, biogeochemical and productive functions of soils of the Baikal region as a component of the biosphere, assessment of their resource potential and development of technologies for rational use and protection» 2021-2022.