Northeast United States

Porewater nutrient concentrations from control plots at a Typha sp. dominated brackish marsh on the Upper Parker River, Plum Island Ecosystem LTER, MA.

Abstract: 

Porewater samples from a Typha sp.-dominated brackish marsh on the Upper Parker River in the Plum Island Ecosystem (PIE) LTER site were analyzed for ammonium, phosphate, sulfide and chloride concentrations.

Core Areas: 

Data set ID: 

137

Keywords: 

Short name: 

LTE-MP-OTC-porewatermeans

Purpose: 

 

Data sources: 

LTE-MP-OTC-porewatermeans_csv
LTE-MP-OTC-porewatermeans_xls

Methods: 

General:

This data set is part of an on-going LTER project at the Plum Island Ecosystem (PIE) site.   The sampling location is in a Typha-dominated marsh on the Parker River in Byfield MA. 

Sampling Description:
Triplicate porewater diffusion samplers were permanently installed in control plots on the marsh platform in a Typha-dominated brackish marsh.  Each sampler collects porewater from depths of 10, 25, 50, 75, and 100 cm.  Samples are retrieved  approximately monthly from May through October.  Porewater samples are either filtered (0.2 uM) and preserved with HCl (for PO4 and NH4) or preserved unfiltered with ZnAc (for sulfides) either in the field or immediately upon return from the field.  The samples are then shipped to a lab in SC.  Porewater collection began in June 2000.  In May 2006 the porewater samplers were relocated  due to potential contamination from fertilized plots. 

Lab Methods:
Filtered porewater samples are analyzed for PO4 and NH4 concentrations according to standard laboratory protocols (Strickland and Parson 1972).  Salinity was calculated from chlorinity of filtered porewater samples (measured by coulometric titration using a Haake-Buchler chloridometer) before August 2020.  Beginning in August 2020, salinity was determined using an EXTECH EC600conductivity meter   Unfiltered, preserved porewater samples are analyzed for sulfide colorimetrically (Cline 1969).

Numerical Processing:
Data are reported as geometric means of sample concentrations from 3 depths within the root zone (10, 25, and 50 cm), and the 95% confidence interval, for 3 replicate samplers (n=9 per time).  Statistics were computed using SAS (SAS System for Windows; release 8.02; SAS Institute, Inc; Cary, NC).

Maintenance: 

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 2021.
Version 01; new data and metadata
Version 02; new data and metadata
Version 03: February 2, 2012, updated data and metadata to Oct 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 23, 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: March 7, 2016, edited incorrect BD and "." values, 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 09: September 15, 2017, edited multiple missing value code issues, 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
Version 10: June 14, 2018, data and metadata updated to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2018.xlsm 1/30/2018 2:24 PM for QA/QC to EML 2.1.0
Version 11: February 27, 2019, data and metadata updates to comply with importation to DEIMS7 and LTER Data Portal. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2018.xlsm 6/21/18 3:53 PM for QA/QC to EML 2.1.0
Version 12: October 2, 2020, data and metadata updates to comply with importation to DEIMS7 and LTER Data Portal. Used MarcrosExportEML_HTML (working)pie_excel2007_Sep2020.xlsm 9/17/20 1:11 PM for QA/QC to EML 2.1.0.
Version 13: July 27, 2021, data and metadata updates to comply with importation to DEIMS7 and LTER Data Portal. Used MarcrosExportEML_HTML (working)pie_excel2007_Jul2021.xlsm 7/26/2021 9:04 AM for QA/QC to EML 2.1.0.
Version 14: 09 November 2021, Updated data and metadata. Used MarcrosExportEML_HTML (working)pie_excel2007_Jul2021.xlsm 7/26/2021 9:04 AM for QA/QC to EML 2.1.0.

Additional information: 

 

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