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Peatlands encode information about past vegetation dynamics,climate, and microbial processes. Here, we used δ15N andδ13C patterns from 16 peat profiles to deduce how thebiogeochemistry of the Marcell S1 forested bog in northern Minnesotaresponded to environmental and vegetation change over the past ∼  10 000 years. In multiple regression analyses, δ15N andδ13C correlated strongly with depth, plot location, C ∕ N, %N, and each other. Correlations with  %N,  %C, C ∕ N, andthe other isotope accounted for 80 % of variance for δ15N and38 % of variance for δ13C, reflecting N and C losses. Incontrast, correlations with depth and topography (hummock or hollow)reflected peatland successional history and climate. Higher δ15Nin plots closer to uplands may reflect upland-derived DON inputs andaccompanying shifts in N dynamics in the lagg drainage area surrounding thebog. The Suess effect (declining δ13CO2 since the IndustrialRevolution) lowered δ13C in recent surficial samples. Highδ15N from −35 to −55 cm probably indicated the depth ofectomycorrhizal activity after tree colonization of the peatland over thelast 400 years, as confirmed by the occasional presence of wood down to−35 cm depth. High δ13C at  ∼  4000 years BP (−65 to−105 cm) could reflect a transition at that time to slower rates of peataccumulation, when 13C discrimination during peat decomposition mayincrease in importance. Low δ13C and high δ15N at −213and −225 cm ( ∼  8500 years BP) corresponded to a warm period during asedge-dominated rich fen stage. The above processes appear to be the primarydrivers of the observed isotopic patterns, whereas there was no clearevidence for methane dynamics influencing δ13C patterns

Long-term carbon and nitrogen dynamics at SPRUCE revealed through stable isotopes in peat profiles