Changes in the distribution of chemical elements throughout the profile of a soddy-podzolic soil after the long-term application of sewage sludge

Abstract

The distributions of the total and water-soluble macro- and microelements throughout the profile of a loamy sandy soddy-podzolic soil were studied six years after the long-term (for more than 15 years) application of sewage sludge and lime as ameliorants. It was shown that the anthropogenic factor affecting the distributions of the metals in the soil remained predominant. The highest differences compared to the control were observed for P, S, Cl, Cu, Zn, Ni, and Pb. A second accumulative soil horizon was developed, which was an additional source of contamination with mobile metals for the adjacent environments. Six years after the cessation of the application, the contents of Cu, Zn, and Ni exceeded their PPCs for sandy and loamy sandy soils.