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Measurements of sediment porewater nutrient, sulfide, pH, and alkalinity, 1993 -2004, at a variety of sites and salinities throughout the Plum Island Sound estuary.
Measurements of sediment porewater nutrient, sulfide, pH, and alkalinity, 1993 -2004, at a variety of sites and salinities throughout the Plum Island Sound estuary.
Comparison of NH4+ freely available in sediment porewater to NH4+ exchangeable from sediments, and the variabilty with porewater salinity as it changes with season and along a transect of the Parker River estuary.
Rates of benthic metabolism and nutrient cycling in the Parker and Rowley Rivers of the Plum Island Sound estuary. Measurements include those conducted at two sites in the Parker River in Spring (high river discharge) and Fall (low discharge) for long-term monitoring, also at other sites throughout the estuary over a variety of seasons and salinities.
Marsh sediment porewater nutrient concentrations [NH4+, NO3-, DOC, TDN, H2S] and salinity are reported from Spartina sp. and Typha sp. sites along the Parker and Rowley Rivers, MA. Porewater peeper poles are used for collection and the poles are located in the vicinity of the marsh water table sites for the Railroad, Typha, Shad and Nelson sites.
In this dataset, we used a controlled flow-through reactor (FTR) experiment to test the role of nitrate as an electron acceptor, and its effect on organic matter decomposition and the associated microbial community in salt marsh sediments. Organic matter decomposition significantly increased in response to nitrate, even at sediment depths typically considered resistant to decomposition. The use of isotope tracers suggests this pattern was largely driven by stimulated denitrification.
Water chemistry including nutrient concentrations for various forms of N, P, C, as well as suspended sediments and light extinction coefficients, are determined from bi-annual or tri-annual nutrient transects from the mouth of the Rowely River estuary to near its head about 6 km upstream. Three sets of grab samples and sonde measurements are taken at lower, mid, and upper stations of the estuary, at stations locations that may vary depending on the tide. These samples are generally collected in Spring, Summer, and Fall to capture conditions through the growing season.