Groundwater Plays an Important Role in Controlling Riverine Dissolved Organic Matter in a Cold Alpine Catchment, the Qinghai–Tibet Plateau

Abstract

The permafrost region possesses the largest terrestrial soil carbon pool, which is roughly twice as large as the atmospheric carbon pool (Schuur et al., 2015;Tarnocai et al., 2009). Dissolved organic carbon (DOC) has been used to quantify dissolved organic matter (DOM) since it represents the primary constituent of DOM (∼67%) (Bolan et al., 2011). A large amount of stored soil carbon becomes microbially and hydrologically available under

Unraveling the Coupled Dynamics between DOM Transformation and Arsenic Mobilization in Aquifer Systems during Microbial Sulfate Reduction: Evidence from Sediment Incubation Experiment

“…Our findings align partially with previous observations in arsenic-contaminated aquifer systems [21], particularly highlighting the presence of endogenous humic-like DOM components that could be conducive to As mobilization under microbial sulfate reduction conditions. Moreover, the observed DOM transformation and predominant components after prolonged incubation align with earlier findings in groundwater from the Niyaqu catchment [53] and a permafrost zone on the Tibetan Plateau [54]. Therefore, the present novel insights could provide evidence for the biogeochemical processes controlling DOM transformation in alpine and cold aquifer systems, and they can also improve our understanding of co-evolution between DOM transformation and As mobilization in As-rich aquifer systems worldwide.…”