Spartina alterniflora

Porewater nutrient concentrations from control plots at a Spartina alterniflora-dominated salt marsh at Law's Point, Rowley River, Plum Island Ecosystem LTER, MA.

Abstract: 

Porewater samples from a Spartina alterniflora-dominated salt marsh on the Rowley River in the Plum Island Ecosystem (PIE) LTER site were analyzed for ammonium, phosphate, sulfide and salinity concentrations.

Core Areas: 

Data set ID: 

126

Keywords: 

Short name: 

LTE-MP-LAC-porewatermeans

Purpose: 

 

Data sources: 

LTE-MP-LAC-porewatermeans_csv
LTE-MP-LAC-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 Spartina alterniflora-dominated marsh at Law's Point between the Rowley River and West Creek in Rowley MA. 

Sampling Description:
Triplicate porewater diffusion samplers were permanently installed in control plots on the marsh platform in a Spartina alterniflora-dominated salt 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 (0.45 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.  These samples are then shipped to the lab in SC.  Porewater collection began in June 1999.  In May 2006 the Control porewater plots were relocated  due to potential contamination from fertilized plots. 

Lab Methods:
Filtered porewater samples are analyzed for PO4 and NH4 according to standard laboratory protocols (Strickland and Parsons 1972) and for chloride concentrations by coulometric titration using a Haake-Buchler chloridometer.  Unfiltered, preserved porewater samples are analyzed for sulfide concentrations colorimetrically (Cline 1969).  Salinity was calculated from chloride concentrations of filtered porewater samples (by coulometric titration using a Haake-Buchler chloridometer) before August 2020.  Beginning in August 2020, salinity was measured using an EXTECH EC600 conductivity meter.

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).

Elevation:
LTE-MP-LPA, ~ 1.17 meters NAVD88

 

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, 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: 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
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.

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