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Soil organic carbon (SOC) is a key property for both fertility and carbon level control in the atmosphere. SOC changes in soils are ruled by tillage and erosion. Initial SOC erosion was investigated using a laboratory rainfall simulator. Six precipitation events were modelled on cultivated, bare Cambisol monolith with various slope steepness and surface roughness under a constant intensity of 80 mm h⁻¹. The total amount of soil loss was divided into four aggregate size classes (<0.05, 0.05–0.25, 0.25–1.00, >1.00 mm). Altogether, 72 sediment and 16 in situ samples were analysed. The results show a loss of SOC concentration that increased at all aggregate sizes, the highest (~200 %) found in the smallest grain size, while conversely nitrogen concentration decreased in the 250–1000 μm class. Consequently, soil organic matter (SOM) compounds underwent changes during the initial erosion processes in soil …