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:LTE-MP-LPC-productivitymeans.08
Dataset Title:Annual productivity in control plots at a Spartina patens-dominated salt marsh at Law's Point, Rowley River, Plum Island Ecosystem, MA.
Investigator 1: 
First Name:Jim
Last Name:Morris
Address line 1:Dept of Biological Sciences
Address line 2:
Address line 3:University of SC
Zip Code:29208
Investigator 2: 
First Name:Karen
Last Name:Sundberg
Address line 1:Baruch Marine Field Laboratory
Address line 3:PO Box 1630
Zip Code:29442
Associate Investigators:Rob Daoust
Keywords:LTER, PIE, Plum Island Ecosystems, Massachusetts, Rowley River, primary production, estuary, salt marsh, Spartina patens, primary productivity, Northeast United States
Abstract:Annual productivity is determined from aboveground biomass data collected destructively from control plots during the growing season at a Spartina patens-dominated salt marsh on the Rowley River within the Plum Island Ecosystem (PIE) LTER site, MA.
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 LTE-MP-LPC-productivitymeans
Beginning Date 5/1/2001
End Date 12/31/2016
Number of Data Records 17
Other Files to Reference LTE-MP-LAC-productivitymeans; LTE-MP-NAC-productivitymeans
Availability Status type 1
Quality Control Information
Maintenance Description Collections occur approximately every month from May through October. Database is updated once annually, usually in the winter. Study and data collection are ongoing as of Dec 2015.
Log of Changes: Version 01; new data and metadata
Version 02; new data and metadata
Version 03: February 2, 2012, updated data and metadata to Dec 2011. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 2/1/12 5:00 PM for QA/QC to EML 2.1.0
Version 04: August 8, 2013, 2012 data and metadata updated to comply with importation to Drupal and LTER PASTA. Research location name and description updated.Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 3/14/13 12:02 PM for QA/QC to EML 2.1.0
Version 05: April 22, 2014, 2013 data and metadata updated to comply with importation to Drupal and LTER PASTA.Used MarcrosExportEML_HTML (working)pie_excel2007_Sep2013.xlsm 9/30/13 02:57 PM for QA/QC to EML 2.1.0
Version 06: February 18, 2015, data and metadata updates to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2015.xlsm 1/15/15 4:26 PM for QA/QC to EML 2.1.0
Version 07: February 24, 2016, data and metadata updates to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2015.xlsm 1/15/15 4:26 PM for QA/QC to EML 2.1.0
Version 08: September 15, 2017, data and metadata updates to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jun2017.xlsm 6/15/17 10:23 AM for QA/QC to EML 2.1.0
Geographic Description Law's Point on Rowley River, Rowley, MA, site of PIE LTER Spartina patens plot level fertilization experiment  
Location Bounding Box    
West Bounding Coordinate    
East Bounding Coordinate    
North Bounding Coordinate    
South Bounding Coordinate    
OR if single point location    
Latitude 42.730954  
Longitude -70.842915  
Taxonomic Protocols
Organisms studied Spartina patens
This data set is part of an on-going LTER project at the Plum Island Ecosystem (PIE) site. The sampling location is in a Spartina patens-dominated marsh at Law's Point between the Rowley River and West Creek in Rowley MA.

Sampling Description:
The biomass-estimation method is destructive. Three control plots were permanently established in the marsh. For sampling, a 10x10 cm quadrat is placed randomly in each plot, and all plants are clipped within 1 cm of the sediment surface and placed into a labelled plastic bag for transport to the lab. Live and dead plants are separated, and live plants are separated by species. Plants are placed into labelled paper bags, dried at 60C and weighed. Sampling occurs approximately monthly from May to Oct.

Permanent census plots were established in August 2000. The first complete year of data collection available for annual productiviy is 2001. In May 2006 the plots were moved due to potential contamination from fertilized plots.

Data processing:
All data are entered into an Excel spreadsheet. Annual productivity is determined using a variation of the Smalley method and SAS (SAS System for Windows; release 8.02; SAS Institute, Inc; Cary, NC), and is based on standing live+dead biomass at peak live biomass. Data are reported as the mean annual productivity and standard error of the 3 plots (n=3).

Elevation: LTE-MP-LPP, ~ 1.4 meters NAVD88

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
site name of sampling station   nominal          
year year   datetime     yyyy    
annual productivity mean annual productivity, dry weight gramPerMeterSquaredPerYear ratio   real   . .=not measured
stderr standard error of the mean gramPerMeterSquaredPerYear ratio   real   . .=not measured