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This article presents indicators of the influences of salts of iron, mercury, and copper on the acid- base properties of aqueous extracts from the upper soil horizons of taiga zones. Their acidification is estab- lished; under the influence of metals, the processes responsible for elevated levels of protons in the extracts are identified, viz., the hydrolysis of metal ions and their inclusion in the complexation with water-soluble organic substances. We discovered the effects on these processes of organic materials of the extracts, as well as of the properties of metals and the type and amount of salts, in whose composition the metals are included in the extracts.