SPECIFICITY OF THE MANIFESTATION OF ACID-BASE BUFFERING CAPACITY OF BROWN SOILS OF THE CARPATHIAN MOUNTAIN-FOREST PROVINCE
DOI:
https://doi.org/10.31861/biosystems2025.01.162Keywords:
brown forest soils, brownish-podzolic gleyed soils, actual soil acidity, acid-base buffering capacity, soil neutralizing capacity, soil buffering capacityAbstract
The purpose of the research was to establish the specificity of the acid-base buffering capacity of soils of the brown earth type of the Carpathian mountain-forest province with different genetic features.
The regularities of formation and parameters of the acid-base buffering capacity of brown earth and brownish-podzolic soils under forest and herbaceous phytocenoses were analyzed. Based on the results of potentiometric titration with increasing concentrations (normality from 0.005 to 0.05) of hydrochloric acid and sodium hydroxide, buffering curves were constructed and indicators of buffer properties were determined, in particular, the neutralizing and absorbing capacity of the soil with respect to acid and alkali, anti-acid and anti-base buffering capacity, pH gradients with respect to pНCaCl2 (initial pH of buffer curves) at minimal acid and alkaline load.
For the studied soils, estimated indicators of acid-base buffering capacity were determined - potential buffer capacity in the acidic and alkaline load interval, as well as the buffer asymmetry coefficient. General patterns of formation of acid-base buffering capacity depending on the type of phytocenosis in soils of the brown earth type of the Carpathian mountain-forest province were established.
A similar nature of the manifestation of acid-base buffering properties by soils of the brown earth type was established, regardless of the type of phytocenosis and the specifics of the genetic nature of the soil. Brown mountain-forest and mountain-meadow and brownish-podzolic gleyed soils exhibit a high buffering capacity with respect to alkaline loads and a significantly lower one with respect to acidic loads, i.e. the acid-base equilibrium of the soil solution is much easier to shift towards acidification.
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