Temporal changes in soil chemical compositions in acidified mountain forest soils of Czech Republic

Abstract The study aimed to investigate the temporal changes of pH, sorption complex, and structure soil organic matter through forest profile under beech spruce forests located in Jizera mountains (Czech Republic) affected by natural anthropogenic acidification. Soil samples were collected four different years (2008, 2013, 2015, 2020) each horizon: fermented horizons (F), humified (H), organo-mineral (A), subsurface mineral (B) (cambic or spodic). cation exchange capacity (CEC), base saturation (BS), exchangeable element contents, carbon content (SOC) determined. infrared spectra used calculate indices potential wettability, aromaticity, decomposition. Our results showed that most nutrients aliphatic compounds retained uppermost layers. aromaticity increased with depth, while polysaccharides, regarding decomposition compound, disappeared horizons. In a long-term observation, SOC had constantly beech, remained stable Exchangeable contents horizon, except for Al Fe; their quickly decreased F slowly H horizon both tree species, deeper constant, but A spruce. Continuously increasing cations concentrations complex species during period revealed effect stand types on acid deposition reduction mitigation. CEC, BS, SOC, wettability are more intensive than floor.