Нydrochemical differentiation in bog ecosystems

Oligotrophic bogs are presented by a combination of microlandscapes with varying water tables and vegetation. The variability of these features may influence the rate of plant residue decomposition and the efficiency of biogenic compounds accumulation. These processes affect the formation of the microlandscape hydrochemical system and the bog. This study examines the variability of hydrochemical features in the main microlandscapes of the Mukhrino oligotrophic bog, located in the middle taiga subzone of Western Siberia. The study aim was to identify the distinctive features of bog water composition. The measured properties included concentrations of cations (Na+, NH4+, K+, Mg2+, Ca2+) and anions (Cl–, SO42–, PO43–, NO3–) dissolved organic carbon (DOC) and its spectral characteristics (SUVA254) . The dominant ions in the water are Na+ и K+ and Cl⁻ and Cl– и SO42–. Relative to the total measured ion concentrations, the ecosystems form the following order of increasing compound concentration: ryam-hollow complex (RHC) – open bog – ridge-hollow-pool complex (RHPC) – ridge-hollow complex (RHC) – typical ryam. A hydrochemical feature of the RHK is high DOC concentrations with low ion content. The open bog ecosystems are characterized by a cation composition dominated by K+ and NH4+. The GHPC exhibit elevated SO42– in the anionic composition, whereas the RHC areas show higher Cl–. concentrations. However, the waters of both ecosystems demonstrate low dissolved organic carbon (DOC) concentrations (71.3 and 66.1 mg/L, respectively). The typical ryam stands out with the highest DOC (85,8 mg/L) and measured ion concentrations.