Abstract:

This dataset contains values for the phosphorus sorption index (PSI) collected from 13 marshes in Terrebonne (TB), western Barataria (WB), and eastern Barataria Bay (EB), LA. In TB and EB we sampled two oiled marshes and two unoiled marshes, and in WB we sampled three oiled marshes and two unoiled marshes. At each marsh, we sampled along a 20-m transect from the marsh edge and collecting soil samples every 5 m. Each sample was analyzed for PSI and a suite of physical (soil water content, bulk density) and chemical properties (pH, organic C, total N, molar C:N ratio, total P), and extractable iron, aluminum, and two forms of phosphorus. Using these measurements, we estimated the phosphorus saturation ratio (PSR) and soil phosphorus storage capacity (SPSC). This dataset is used in the publication: Marton JM and Roberts BJ. 2014. Spatial variability in phosphorus sorption dynamics in Louisiana salt marshes. JGR-Biogeosciences 119: 451–465. DOI: 10.1002/2013JG002486.

Suggested Citation:

Roberts, Brian and John Marton. 2016. Phosphorus Sorption Dynamics in Louisiana Brackish and Salt Marshes, September 2012. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N71Z429R

Publications:

Marton, J. M., & Roberts, B. J. (2014). Spatial variability of phosphorus sorption dynamics in Louisiana salt marshes. J. Geophys. Res. Biogeosci., 119(3), 451–465. doi:10.1002/2013jg002486

Purpose:

This dataset was developed as part of a research project investigating the effects of the Deepwater Horizon oil spill on salt marsh biogeochemistry. This particular project was directed to determine if the marsh’s ability to sorb reactive phosphorus was impinged following oil exposure.

Data Parameters and Units:

Region- Region of collection (TB- Terrebonne Bay; WB- western Barataria Bay; EB- eastern Barataria Bay) Site- Site identifier Latitude (decimal degrees) Longitude (decimal degrees) Plot- Plots along transect Oiled- Indicates whether the marsh received Macondo Oil Distance- Distance from the marsh edge of the sampling plot (meters) Salinity- Salinity of adjacent bay water (PSU) PSI- Phosphorus Sorption Index (mg P sorbed per 100 g soil) Fe- Extractable iron (mg Fe per g soil) Al- Extractable aluminum (mg Al per g soil) PO4-P (µg/g)- Sodium bicarbonate extractable phosphorus (micrograms PO4-P per gram soil) PO4-P (µM/g)- Sodium bicarbonate extractable phosphorus (micromoles PO4-P per gram soil) Pox (µg/g)- Ammonium oxalate extractable phosphorus (micrograms PO4-P per gram soil) Pox (µM/g)- Ammonium oxalate extractable phosphorus (micromoles PO4-P per gram soil) pH- soil pH (unitless) Water Content- gravimetric soil water content (%) Organic Matter- soil organic matter content (%) Bulk density- soil bulk density (grams per cubic centimeter) Organic C- soil organic carbon content (%) Total N- soil total nitrogen content (%) C:N- soil molar carbon to nitrogen ratio Total P- soil total phosphorus (micrograms P per gram soil) N:P- soil molar nitrogen to phosphorus ratio CEC- cation exchange capacity (milli-equivalents per 100 grams soil) Sand- percent sand fraction of soil Silt- percent silt fraction of soil Clay- percent clay fraction of soil PSR- Phosphorus Saturation Ratio (unitless; ammonium oxalate extractable P divided by the sum of the molar concentrations of extractable soil iron and aluminum) SPSC- Soil Phosphorus Storage Capacity (micromoles of additional P able to be sorbed per gram)

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