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GCE-LTER Data Set Summary

Accession: PLT-GCET-1703a Research Theme: Plant Ecology (Graduate Thesis Study)
Contributors: Fan Li, Steve Pennings
Title: Plant Responses to the GCE-LTER Seawater Addition Long Term Experiment (SALTEx) from 2013 to 2016
Abstract: This study was conducted in a tidal freshwater marsh (31°20'16" N, 81°27'52" W) on the Altamaha River, GA. Each plot was defined by a 2.5 m x 2.5 m polycon frame, inserted 12 cm into the soil. The frames had drain holes in the sides above the soil surface that were plugged when plots were watered but open otherwise to allow tidal exchange. The plots were randomly assigned to five treatments. Plots were monitored without imposing any treatments in 2013. Treatments started on April 14, 2014. Plots receive diluted saltwater (press and pulse of saline water treatments, n=6), freshwater (freshwater addition treatment, n=6), or no water additions (control with frame and control treatments, n=6 and 7, respectively). The press plots received additions of a mixture of seawater and fresh river water four times each week. Pulse plots received the same mixture but only for 8 weeks in September and October. The freshwater treatment plots received additions of fresh river water four times each week. To document treatment effects on the plant community, we measured stem height, photosynthesis, and percent cover of plants, and blocking of light by the vegetation. We used the same 0.75 m x 0.75 m subplot inside each plot for plant measurements, and took the measurements 3 - 6 times during each growing season from 2013 to 2016. We measured height of all stems of Zizaniopsis miliacea and Persicaria hydropiperoides, and all leaves of Pontederia cordata. In each plot, we chose the tallest individual of those three species and measured their photosynthetic rates using LCi photosynthesis System (ADC BioScientific Ltd, Hoddesdon, UK). Around the same dates, we also visually estimated the percent cover of Ludwigia repens, Persicaria hydropiperoides, Pontederia cordata, and Zizaniopsis miliacea in the entire 2.5 m x 2.5 m plot. We summed the stem heights by species as a first approximation of species biomass. We measured the photosynthetically active radiation (PAR) above top and underneath (10 cm above the soil) the plant canopy in each plot using a Sunscan Canopy Analysis System (AT Delta-T Devices Cambridge England) 4-6 times during each growing season from 2014 to 2016. We report the proportion of light penetrating the canopy.
DOI: 10.6073/pasta/b4afc8a355fe4b9231474229ede03f72
Key Words: Ludwigia, percent cover, Persicaria, Pontederia, salinity, Scirpus, Typha, Zizaniopsis
LTER Core Area: Primary Production
Research Themes: Plant Ecology
Study Period: 01-Jun-2013 to 15-Nov-2016
Study Sites:
SALTEx -- SALTEx Research Site, Champney Island, Georgia, USA
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Downloads: Information

Data Table: PLT-GCET-1703a_Cover (Percent cover of plant species, 2537 records)

Access: Public (released 01-Mar-2017)

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

Data Files: Spreadsheet (CSV) [155.90kb],  Text File [145.95kb],  Text Report [171.80kb],  MATLAB (GCE Toolbox) [796.45kb],  MATLAB (Variables) [767.50kb]

Column List:(display)


Data Table: PLT-GCET-1703a_Height (Individual stem heights, 36668 records)

Access: Public (released 01-Mar-2017)

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

Data Files: Spreadsheet (CSV) [2152.68kb],  Text File [2009.49kb],  Text Report [2228.18kb],  MATLAB (GCE Toolbox) [10084.70kb],  MATLAB (Variables) [10056.64kb]

Column List:(display)


Data Table: PLT-GCET-1703a_PAR (Photosynthesic available radiation measurements, 455 records)

Access: Public (released 01-Mar-2017)

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

Data Files: Spreadsheet (CSV) [16.39kb],  Text File [15.13kb],  Text Report [30.77kb],  MATLAB (GCE Toolbox) [174.59kb],  MATLAB (Variables) [146.14kb]

Column List:(display)


Data Table: PLT-GCET-1703a_Photosynthesis (Leaf photosynthetic rate from CO2 gas flux measurement, 1449 records)

Access: Public (released 01-Mar-2017)

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

Data Files: Spreadsheet (CSV) [90.12kb],  Text File [84.50kb],  Text Report [105.10kb],  MATLAB (GCE Toolbox) [500.11kb],  MATLAB (Variables) [471.48kb]

Column List:(display)

Statistics: Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS
Citation: Li, Fan. 2017. Plant Responses to the GCE-LTER Seawater Addition Long Term Experiment (SALTEx) from 2013 to 2016. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/b4afc8a355fe4b9231474229ede03f72

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959 and OCE-1237140. 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.