Monitoring the Organic Matter Quality Highlights the Ways in Which Organic Matter Is Removed from Wetland Soil

It has long been considered that ferric phases stabilize organic matter (OM) in soils. Temporarily waterlogged soils, which Fe is submitted to regular reductive solubilization and oxidizing precipitation, have often used study these processes. However, few studies interested the evolution of OM quality under such conditions. We therefore experimentally investigated impact a redox cycle on dissolved (DOM) from wetland soil. The DOM was monitored using combination analyses run elements (%C, %N, C/N), isotopes (?15N, ?13C), optical index (specific UV absorbance at 254 nm), fluorescence indexes (FI, HIX, BIX). In addition, cation anion concentrations were also determined soil solutions throughout experiment. As classically demonstrated, solubilized as terrestrial aromatic molecules first stage reducing period, then nonaromatic until end reduction, response dissimilatory dissolution Fe-oxyhydroxides More interestingly, we demonstrate reintroduction O2 involves significant lysis bacterial cells involving production small labile carbon represents pathway for degradation. Moreover, physical constraints, newly formed Fe-OM precipitates produce aggregates rich are expected disseminate environment, representing second way remove OM.