In this article, learn about soils and the amount of salmon-derived nutrients (SDN) in Southeast Alaska! Salmon-derived nutrients are nutrients in the soils that are from decomposing salmon. The scientists looked at how alluvial soil affected the role of SDN in the North Pacific coastal rainforests of southeast Alaska. Topics: Carbon, Water, Wildlife, Alluvial Soil, Auger, Carbon, Geomorphology, Isotopes.