Plum Island Ecosystems LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:MAR-PR-Porewater.03
Dataset Title:Marsh sediment porewater nutrient concentrations from Spartina sp. and Typha sp. sites along the Parker River, MA.
Investigator 1: 
First Name:Anne
Last Name:Giblin
Address line 1:Ecosystems Center
Address line 2:MBL
Address line 3:7 MBLSt
City:Woods Hole
Zip Code:02543
Investigator 2: 
First Name:Charles
Last Name:Hopkinson
Address line 1:Georgia Sea Grant College Program
Address line 2:University of Georgia
Address line 3:229 Marine Sciences
Zip Code:30602
Associate Investigators:Emily Gaines, William Lee, Christina Maki, Aaron Strong, Rebecca Prosser, Colin Millar, Catherine Caruso, Samuel Kelsey
Keywords:PIE LTER, inorganic nutrients, organic matter, Spartina alterniflora, Spartina patens, Typha, macrophyte, ammonium, sediment, marsh, salinity, porewater
Abstract:Marsh sediment porewater nutrient concentrations [NH4+, NO3-, DOC, TDN] and salinity are reported from Spartina sp. and Typha sp. sites along the Parker River, MA. Porewater peeper ploes are used for collection and the poles are located in the vicinity of the marsh water table sites for the Railroad and Typha sites.
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Online URL:
Data File URL
Data File Name MAR-PR-Porewater
Beginning Date 9/28/2004
End Date 11/15/2010
Number of Data Records 1015
Other Files to Reference
Availability Status Type 1
Quality Control Information
Maintenance Description Porewater is sampled monthly from May through December
Log of Changes: Version 01, 20Jan2009 metadata and data online
Version 02: January 24, 2012, updated data and metadata through 2010. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 1/18/12 4:51 PM for QA/QC to EML 2.1.0
Version 03: June 12, 2017, updated research location info and metadata for DEIMS 7 and PASTA.Used MarcrosExportEML_HTML (working)pie_excel2007_Jun2017.xlsm 6/12/17 11:22 AM for QA/QC to EML 2.1.0
Geographic Description Railroad Site, Lower Parker River, downstream of railroad bridge, Spartina dominated marsh edge, river kilometer is PR-12.75 Typha site, Upper Parker river, Typha-dominated marsh edge, PR-21.75 km  
Location Bounding Box      
West Bounding Coordinate      
East Bounding Coordinate      
North Bounding Coordinate      
South Bounding Coordinate      
OR if single point location      
Latitude 42.7616032888889 42.7508503277778  
Longitude -70.858873525 -70.9148603083333  
Elevation 1.34 1.39  
Taxonomic Protocols
Organisms studied Spartina alterniflora; Spartina patens; Typha sp.
Methods:Porewater is sampled monthly from May through December. Samples are retrieved from four diffusion sampling poles at two sites, Railroad and Typha, along the Parker River. At each site, one pole is located 4 m from creek edge and another pole is 10 m from creek edge. Samples are retrieved at depths of 10, 25, 50, 75, and 100 cm, and are filtered and partitioned for analysis. Nitrate, NH4, DOC, and TDN concentrations are measured in each sample according to standard laboratory protocols, and salinity is measured using a conductivity probe. Analyses are conducted according to PIE-LTER protocols (

The Railroad site is dominated by Spartina sp and the Typha site is dominated by Typha sp.

NOTES AND COMMENTS: Phosphate was only measured for some 2004 samples.

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
Date Date of sample collection   datetime     DD-MON-YYYY    
Location Sample location   nominal Typha 4m = Typha site 4m from creek edge | Typha 10m = Typha site 10 m from creek edge | RR 4m = Railroad site 4m from creek edge | RR 10m = Railroad site 10 m from creek edge        
Depth Sample depth (10, 25, 50, 75, 100) 10 = 10 cm below marsh surface centimeter ratio   real      
Sal Salinity partPerThousand ratio   real   NA NA = not available
NO3 Nitrate concentration as NO3-N micromolePerLiter ratio   real   NA NA = not available
NH4 Ammonium concentration as NH4-N micromolePerLiter ratio   real   NA NA = not available
DOC Dissolved organic carbon concentration as C micromolePerLiter ratio   real   NA NA = not available
TDN Total dissolved nitrogen concentration as N micromolePerLiter ratio   real   NA NA = not available
PO4 Soluble reactive phosphate concentration as PO4-P micromolePerLiter ratio   real   NA NA = not available