Distinct Fe- and Ca-Mediated Stabilization Pathways of Mineral-Associated Organic Carbon in Karst Spring-Fed River Sediments
River sediments are vital organic carbon reservoirs, yet the formation mechanisms of mineral-associated organic carbon (MAOC) in karst spring-fed rivers remain poorly understood. Here, we investigated sediments, water chemistry, submerged macrophytes, and sediment-extracted dissolved organic matter (DOM) from five typi...