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-LAC-porewatermeans.01 |
| Dataset Title: | Nutrient concentrations from porewater samples at a Spartina alterniflora-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 |
| City: | Columbia |
| State: | SC |
| Zip Code: | 29208 |
| Country: | USA |
| Investigator 2: | |
| First Name: | Karen |
| Last Name: | Sundberg |
| Address line 1: | Baruch Marine Field Laboratory |
| Address line 3: | PO Box 1630 |
| City: | Georgetown |
| State: | SC |
| Zip Code: | 29442 |
| Country: | USA |
| Associate Investigators: | Rob Daoust |
| Keywords: | estuary; salt marsh; Spartina alterniflora; porewater; ammonium; phosphate; sulfide; chloride; Northeast United States |
| 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 chloride concentrations. |
| Contact: | Plum Island Ecosystems LTER Information Manager The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole, MA 02543 Phone (508) 289 7485 Email: pie_im@mbl.edu Online URL: http://ecosystems.mbl.edu/PIE/ |
| DATA FILE INFORMATION: | |
| Data File Name | LTE-MP-LAC-porewatermeans |
| Beginning Date | 6/1/1999 |
| End Date | 10/31/2005 |
| Number of Data Records | 37 |
| Other Files to Reference | LTE-MP-LPC-porewatermeans; LTE-MP-NAC-porewatermeans |
| Availability Status | type 1 |
| Quality Control Information | |
| Maintenance Description | Collections occur every month from May through October. Database is updated once annually, usually in the winter. Study and data collection are ongoing as of Jan 2006. |
| Log of Changes: | |
| RESEARCH LOCATION: | |
| Geographic Description | Plum Island Ecosystems (PIE) LTER site, northeastern, Massachusetts, Law's Point on Rowley River |
| Location Bounding Box | |
| West Bounding Coordinate | |
| East Bounding Coordinate | |
| North Bounding Coordinate | |
| South Bounding Coordinate | |
| OR if single point location | |
| Latitude | 42.7317 |
| Longitude | -70.8425 |
| Methods: | Sampling Description: Triplicate porewater diffusion samplers are permanently installed in control plots on the marsh platform in a Spartina alterniflora-dominated salt marsh at the Plum Island Ecosystem (PIE) LTER site. Each sampler collects porewater from depths of 10, 25, 50, 75, and 100 cm. Samples are retrieved 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) immediately upon return from the field. These samples are then shipped to the lab in SC. Lab Methods: Filtered porewater samples are analyzed for PO4, NH4, and chloride concentrations according to standard laboratory protocols (Strickland and Parson 1972). Unfiltered, preserved porewater samples are analyzed for sulfide (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 upper 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). |
| Variable Name | Variable Description | Units | Measurement Scale | Code Infomation | Number Type | DateTime Format | Missing Value Code | Missing Value Code Explanation |
| site | name of sampling station | nominal | ||||||
| year | year | datetime | yyyy | |||||
| month | month | datetime | mm | |||||
| Cl | chloride concentration, gCl/l | gramsPerLiter | ratio | real | . | .=not measured | ||
| L1 (Cl) | lower limit; 95% confidence interval; gCl/l | gramsPerLiter | ratio | real | . | .=not measured | ||
| L2 (Cl) | upper limit; 95% confidence interval; gCl/l | gramsPerLiter | ratio | real | . | .=not measured | ||
| NH4 | ammonium concentration, uM-N | microMolesPerLiter | ratio | real | . | .=not measured | ||
| L1 (NH4) | lower limit; 95% confidence interval; NH4, uM-N | microMolesPerLiter | ratio | real | . | .=not measured | ||
| L2 (NH4) | upper limit; 95% confidence interval; NH4, uM-N | microMolesPerLiter | ratio | real | . | .=not measured | ||
| PO4 | phosphate concentration, uM-P | microMolesPerLiter | ratio | real | . | .=not measured | ||
| L1 (PO4) | lower limit; 95% confidence interval; PO4, uM-P | microMolesPerLiter | ratio | real | . | .=not measured | ||
| L2 (PO4) | upper limit; 95% confidence interval; PO4, uM-P | microMolesPerLiter | ratio | real | . | .=not measured | ||
| S2 | sulfide concentration, uM-S | microMolesPerLiter | ratio | real | . | .=not measured | ||
| L1 (S2) | lower limit; 95% confidence interval; S2, uM-S | microMolesPerLiter | ratio | real | . | .=not measured | ||
| L2 (S2) | upper limit; 95% confidence interval; S2, uM-S | microMolesPerLiter | ratio | real | . | .=not measured | ||
| comments | Information pertaining to individual data points | nominal |