Formation of chemical properties of brown soil under the influence of simulated acid rainfall in a lysimeter experiment

Abstract

In natural ecosystems, the soil reaction is stable and related to the habitat conditions. In arable soils used for agricultural purposes, there is a constant need to correct the reaction to the level corresponding to the requirements of plants. In lysimeter studies, the rate of acidification and its extent were determined in the profile of agricultural brown soil under the influence of simulated acid rainfall. It was estimated that acidification of the simulated acid rainfall, equivalent to the sum of exchange bases of the brown soil Ap level, increased the concentration of magnesium 15-fold and calcium 9-fold in lysimeter filtrates compared to washing with water. The introduced hydrogen cations eliminate alkaline cations from the soil sorption complex, and with increasing concentration they increase the leaching range in the soil profile, exchangeable aluminum appears in the upper part of the profile. The degree of saturation of the brown soil sorption complex under the influence of acidification equivalent to the sum of exchangeable bases of the Ap level decreases to zero in the top part of the profile, while in the bottom part shows a slight reaction. Under the influence of increasing acidity, the dynamics in the profile of available magnesium forms is ambiguous, the available phosphorus content increases in the A and B levels, while the available potassium content does not change significantly.