@conference{
author = "Hukić, E. and Subašić, M. and Tosti, Tomislav and Đogo Mračević, S. and Štrbac, S. and Stojadinović, Sanja M. and Kašanin-Grubin, Milica",
year = "2021",
abstract = "Research in forest ecosystems is focused on recent and past extreme events caused by drought, heat, storms and frost [1,2]. This research aims at exploring soil-specific processes of element leaching in relation to the impact of soil wetting cycles after freezing and heating. Loosely bound nutrients (ions/elements) react differently to thermodynamic conditions, which are interesting to analyze associated with climate change and soil water depletion. Soil drying is related to the increase in air temperature. Repeated drying and wetting increases mineralization of the organic matter, and thus increases the availability and losses of nutrients. The effect of freezing-wetting alters solution fluxes. Both processes are far from being predictable, and there is a lack of knowledge on this subject. The objective of this experiment was to investigate the effects of soil freezing-wetting and heating-wetting cycles on soil leaching processes. Our hypothesis is that freezing and heating of the soil, change the quality of the soil solute, i.e. mineral ions (Na+ , K+ , Ca2+, Mg2+, Al3+, Fe3+, Mn2+, NO2 - , SO4 2-, NO3 - , PO4 3-) concentrations in leachate. Two forest soil profiles, in European beech dominated stand on Mt Bjelašnica in Bosnia and Herzegovina (18˘15’44”E, 43˘42’25”N) were sampled. Soil type corresponded to Calcaric Cambisol (CA) and Chromic Cambisol (CH) according to IUSS Working Group WRB (2015). Soil was sampled by horizons (O, Ah, A/Brz, Brz1, Brz2). Porous plastic glasses were filled with 120g of air-dried soil, two representing different treatments (rewetting-freezing vs. rewetting-heating) and one representing the control. Treatments involved: a) four cycles of wetting the soil (2% intensity, 30’, 120cm3 ) and freezing (-10˘C) vs b) four cycles of wetting the soil (2% intensity, 30’, 120cm3 ) and heating for 3 hours at 40˘C. Control state involved wetting and drying at room temperature. After each wetting cycle, leachate was captured and left in freezer until determining concentrations of cations using Inductively coupled plasma optical emission spectrometer (Thermo scientific iCAP 6000 series) and anions using Dionex ICS 3000. We analyzed 16 samples per profile and per treatment, and 14 control samples, in total 78 samples. The results obtained through this study point that different thermodynamic conditions influence different leaching intensity of soil ions. On the one hand, higher intensity of leaching of Al, Fe and Mn in CH soil was linked with heating-wetting treatments. On the other hand, more intense leaching of Ca, Mg and Na in CC soil was observed after freezing-wetting treatment. The experiment also showed lower leaching intensity of anions after heating-rewetting compare to freezing-wetting. Freezing-wetting cycles, like in our experiment, seems to have higher effect on the ion losses from temperate forest soils.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Book of Abstracts 21st; European Meeting on Environmental Chemistry",
title = "Do Freezing and Heating Cycles Influence Differently on Soil Elements Leaching?",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4907"
}
