SPATIAL AND TEMPORAL VARIATION IN SOIL SALINITY AS A RESULT OF CHEMICAL DE-ICING OF ROAD IN KRAKOW, POLAND

摘要

The aim of the study was to determine the extent to which mixtures of NaCl used during the winter affect the salinity of the soil, and to determine the increase of soil salinity on green belts after the winter. Field studies were conducted in the years 2010-2011 on lawns along major roadway in Krakow. Soil samples were collected in three times series: in July and November 2010 and in March 2011, at fixed depth and distance from the roadway. The pH and electrical conductivity of water and soil solutions were measured. Additionally, in the soil samples was determined the ionic composition of the aqueous extract the sum of bases was calculated from the sum of exchangeable cations: Ca2+, Mg2+, Na+, K+. Significant alkalization of soils was noted in all of their layers, increasing closer to the edge of the roadway. It was shown that excessive salinity is mainly caused by the degree of saturation of the sorption complex of soils with the sodium cation, and the electrical conductivity value is not a fully reliable indicator of soil salinity.