ФОРМИРОВАНИЕ МИКРОЭЛЕМЕНТНОГО СОСТАВА ТЁМНО-СЕРЫХ ЛЕСНЫХ ПОЧВ СТАВРОПОЛЬСКОЙ ВОЗВЫШЕННОСТИ

Abstract

The article discusses the main regularities of the formation of the microelement composition of the dark gray forest soils of the Stavropol Hill. It has been established that the microelement composition of soils is formed under special conditions of the course of soil-forming processes: with a periodically flushed type of water regime, an oxidizing environment in the soil profile, the influx of organic residues with a high content of bases, and the predominance of humic acids in the humus composition. The development of a system of soil compounds of microelements occurs against the background of humus formation, humus accumulation, clay formation, weakened carbonate leaching to the lower part of the soil profile, partial loessage, illuviation. In the soil profile of dark gray forest soils, several geochemical barriers are formed, on which microelements are fixed: biogeochemical, alkaline, and sorption. The main phases-carriers of microelements in dark gray forest soils are organomineral complexes, secondary aluminosilicates of the montmorillonite group. The role of ferruginous minerals in fixing trace elements is weakened due to the low intensity of oxidogenesis processes.