Abstract
The humus status of young different-aged soils developed on tailings of different quarries of Quaternary and pre-Quaternary raw materials in Leningrad oblast was studied. Organic profiles were characterized; the humus accumulation rates, the organic matter reserves, the humus enrichment with nitrogen, the degree of humification of the organic matter, and the contents of separate fractions of humus acid in soils on different tailing rocks were estimated. The composition of humic acids was also studied. It was shown that the lithological features of the tailings determining the chemical processes of the profile differentiation of humic substances and the ecogenetic successions of vegetation also determine the rate and direction of the humus accumulation in the soils during similar periods of biological activity in the southern taiga.
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