Rates of denitrification and porewater nutrient concentrations at a saltmarsh in Alabama from April 2015 to October 2016. (NCEI Accession 0219938)

This dataset is generated from a study of a saltmarsh on Dauphin Island (30o15.43’N, 88o07.438’W) that is dominated by Spartina alterniflora and is interspersed with Juncus roemerianus. Tides are diurnal with mean tidal amplitude of less than 0.5 m. Replicate sediment cores (95 mm ID; n=5) were collected from Spartina alterniflora and Juncus roemerianus dominated sediments during the April 2015 to October 2016 period. Each core was sectioned between the 0-2 and 5-7 intervals and homogenized. Denitrification rates were measured following the acetylene inhibition technique. Porewater nutrient concentrations were periodically collected from triplicate sippers placed in Juncus roemerianus and Spartina dominated patches. Sippers were equipped with a 5-cm sampling window (centered at 10 cm depth). In May and August 2015 additional sediment cores were collected from the Spartina alterniflora and Juncus roemerianus patches and brought back to the laboratory for profiling of the porewater hydrogen sulfide concentrations.