Spatial distribution and concentration of nickel (Ni) in organic horizon and surface mineral soil of forest ecosystems in the Republic of Serbia

This scientific paper investigates the spatial distribution and concentration of nickel (Ni) in the organic layer and surface soil (0-10 cm) of forest ecosystems in the Republic of Serbia. The aim of the research is to determine the influence of regional affiliation (Eastern, Western, Northern, Southern, and Central Serbia) and altitude on nickel accumulation in these forest soil components. Samples of organic layer and soil were collected from representative locations across Serbia. Nickel content was determined after digestion of the samples with aqua regia, and concentrations were analysed using inductively coupled plasma mass spectrometry (ICP-MS). It is expected that the results will show significant variations in nickel content depending on geographical location and altitude, which may be related to the geological substrate, specific pedogenetic processes, climatic conditions, and anthropogenic influences. The significance of the research lies in assessing the potential risk of nickel toxicity to flora, microorganisms, and other ecosystem components, as well as contributing to the understanding of metal biogeochemical cycles in forest soils. The obtained data will serve as a basis for future research and monitoring of soil quality in forest ecosystems in Serbia.