Impact of drying, freezing and re-wetting events soil leachate in acidic versus calcareous soils Scientific paper
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Abstract
This study investigates the impact of drying-rewetting and freezing-rewetting events on soil leachate ion composition across two contrasting geochemical settings through a series of controlled laboratory experiments. Dissolution of ions (Na+, K+, Ca2+, Mg2+, Al3+, Fe3+, Mn2+, F-, Cl-, NO2-, SO42-, NO3-, PO43-) in soil leachate was analysed following rewetting cycles after drying and freezing treatments. The results indicate that variations in leachate ion concentrations are primarily influenced by bedrock type, while drying-rewetting and freezing-rewetting treatments did not significantly impact overall variance. However, some inconsistent differences were observed: higher K+ concentrations in calcareous soils and Al3+, Fe3+ and Mn2+ in acidic soils after drying, higher anion concentrations in calcareous soils in both treatment leachates compared to controls. The findings highlight that the effects of drying, freezing, and rewetting are inherently linked to treatment type, ion characteristics and geochemical conditions.
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