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GCE-LTER Data Set Summary

Accession: NUT-GCES-1609 Research Theme: General Nutrient Chemistry (Directed Study)
Contributors: Christopher B. Craft, Ellen Herbert, Nate Barnett, Sarah Widney, Dontrece Smith
Title: Baseline soil chemistry data measurements from the GCE-LTER Seawater Addition Long-Term Experiment (SALTEx)
Abstract: SALTEx (Seawater Addition Long-Term Experiment) is a field experiment designed to simulate saltwater intrusion in a tidal freshwater wetland to predict how chronic (Press) and acute (Pulse) salinization will affect this and other tidal freshwater ecosystems. The SALTEx experiment was initiated in 2012 and consists of 31 field plots, each 2.5 m on a side. There are three treatments (Press, Pulse, and Fresh) and two types of controls (with and without sides), each consisting of six replicates. The Press treatment plots receive regular (4 times each week) additions of a mixture of seawater and fresh river water. Pulse plots receive the same mixture of seawater and river water during September and October, which is historically a time of low flow in the river when natural saltwater intrusion occurs. The Fresh treatment plots receive regular additions of fresh river water. Treatment water is added during low tide to facilitate its infiltration into the soil, and all plots are inundated by astronomical tides at high tide. Soils were destructively sampled before the beginning of the experiment (March 2014) and after approximately 3 years of treatments (December 2016) and analyzed for bulk density, percent carbon, percent nitrogen, total phosphorus, available phosphorus, available nitrate, and available ammonium.
DOI: 10.6073/pasta/8162944e1543fc592bc9022dd4dcfeba
Key Words: ammonia, carbon, chemistry, nitrate, nitrogen, nutrients, phosphorus, soils
LTER Core Area: Disturbance Patterns, Inorganic Matter, Organic Matter
Research Themes: GCE2 Q1 - External Forcing, GCE2 Q3 - Longitudinal Gradients, GCE3 Area3 - Responses to Salinity and Inundation, General Nutrient Chemistry, Chemistry
Study Period: 26-Mar-2014 to 14-Dec-2016
Study Sites:
SALTEx -- SALTEx Research Site, Champney Island, Georgia, USA
» Download Geographic Coverage: Google Earth
Project References: SALTEx - Seawater Addition Long Term Experiment
Research Protocols:

SALTEx Bulk density protocol (Georgia Coastal Ecosystems LTER)

SALTEx Map Plot Layout (Georgia Coastal Ecosystems LTER)

SALTEx - CHN Anaysis (Georgia Coastal Ecosystems LTER)

SALTEx - Labile Phosphorus Extraction (Georgia Coastal Ecosystems LTER)

SALTEx - Nitrogen Fractionation in Soils (Georgia Coastal Ecosystems LTER)

SALTEx - Ammonia Analysis (Georgia Coastal Ecosystems LTER)

SALTEx - Total Phosphorus (Georgia Coastal Ecosystems LTER)


Craft, C.B., Herbert, E., Li, F., Smith, D., Schubauer-Berigan, J.P., Widney, S., Angelini, C., Pennings, S.C., Medeiros, P.M., Byers, J. and Alber, M. 2016. Climate change and the fate of coastal wetlands. Wetland Science and Practice. 33(3):70-73.

Solohin, E., Widney, S. and Craft, C.B. 2020. Declines in plant productivity drive loss of soil elevation in a tidal freshwater marsh exposed to saltwater intrusion. Ecology. 101(12):13. (DOI: 10.1002/ecy.3148)

Downloads: Information

Data Table: NUT-GCES-1609 (Main data table for data set NUT-GCES-1609, 183 records)

Access: Public (released 10-Sep-2016)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [14.63kb],  Text File [13.91kb],  MATLAB (GCE Toolbox) [174.49kb],  MATLAB (Variables) [NaNkb],  Text Report [34.09kb]

Column List:(hide)

Column Name Units Type Description
1 Year YYYY integer Year the sample was collected
2 Month MM integer Month the sample was collected
3 Day DD integer Day the sample was collected
4 Date yyyy-mm-dd string Date the sample was collected
5 Treatment none string Sample treatment
6 Replicate none integer Replicate
7 Elevation m floating-point Mean plot elevation relative to MLW
8 Sample_depth none string Depth interval of sample
9 Bulk_density g/cm3 floating-point Bulk density of sample
10 Percent_Carbon % floating-point Percent carbon (by weight) of sample
11 Percent_Nitrogen % floating-point Percent nitrogen (by weight) of sample
12 Available_Ammonium µg/g floating-point Available ammonium-N as ug-N/g soil
13 Available Nitrate µg/g floating-point Available nitrate-N as ug-N/g soil
14 Available Phosphate µg/g floating-point Available phosphate as ug-P/g soil
15 Total_Phosphorus µg/g floating-point Total phosphorus as ug-P/g soil
Statistics: Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS
Citation: Craft, Christopher B. 2016. Baseline soil chemistry data measurements from the GCE-LTER Seawater Addition Long-Term Experiment (SALTEx). Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/8162944e1543fc592bc9022dd4dcfeba

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959, OCE-1237140 and OCE-1832178. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.