SPRUCE porewater chemistry data for experimental plots beginning in 2013

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: Griffiths, Natalie A.
Originator: Sebestyen, Stephen D.
Publication_Date: 2016
Title:
SPRUCE porewater chemistry data for experimental plots beginning in 2013
Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:
Publication_Place: Oak Ridge, TN
Publisher: U.S. Department of Energy, Oak Ridge National Laboratory, Carbon Dioxide Information Analysis Center
Online_Linkage: https://doi.org/10.3334/CDIAC/spruce.028
Description:
Abstract:
This data set reports the chemistry of porewater in the SPRUCE plots located in the S1 bog (located in the Marcell Experimental Forest, Minnesota). These data are the pre- and post-treatment data from the SPRUCE experimental treatments (warming and elevated carbon dioxide [CO2]). There are 10 experimental plots in SPRUCE: 5 temperature treatments (+0, +2.25, +4.5, +6.75, +9°Celsius [C]) at ambient CO2, and the same 5 temperature treatments at elevated CO2. There are 7 additional ambient plots without experimental chambers.

Deep peat heating was initiated in the 10 experimental plots in June 2014. Aboveground warming was then added in August 2015 to achieve whole-ecosystem warming. Elevated CO2 was added to half the warming treatments in June 2016. Porewater samples were collected from one nest of 6 piezometers installed in a hollow in each of the 17 SPRUCE plots.

Water samples were analyzed for pH, specific conductivity, nutrient concentrations (ammonium, nitrate, soluble reactive phosphorus, total nitrogen, total phosphorus), cation concentrations (calcium, potassium, magnesium, sodium, aluminum, iron, manganese, silicon, strontium), anion concentrations (chloride, sulfate), and total organic carbon concentrations.
Purpose:
SPRUCE (Spruce and Peatland Responses Under Climatic and Environmental Change) is an experiment to assess the response of northern peatland ecosystems to increases in temperature and exposures to elevated atmospheric CO2 concentrations. It is a key component of the Terrestrial Ecosystem Science Scientific Focus Area of ORNL's Climate Change Program, focused on terrestrial ecosystems and the mechanisms that underlie their responses to climate change. The experimental work is conducted in a Picea mariana [black spruce] - Sphagnum spp. bog forest in northern Minnesota, 40 kilometers (km) north of Grand Rapids, in the USDA Forest Service Marcell Experimental Forest (MEF). The site is located at the southern margin of the boreal forest. It is an ecosystem considered especially vulnerable to climate change, and anticipated to be near its tipping point with respect to climate change. Responses to warming and interactions with increased atmospheric CO2 concentration are anticipated to have important feedbacks on the atmosphere and climate, because of the high carbon stocks in peatlands.

Experimental work in the 8.1-hectare (ha) S1 bog will be a climate change manipulation focusing on the combined responses to multiple levels of warming at ambient or elevated CO2(eCO2) levels. The experiment provides a platform for testing mechanisms controlling the vulnerability of organisms, biogeochemical processes, and ecosystems to climatic change (e.g., thresholds for organism decline or mortality, limitations to regeneration, biogeochemical limitations to productivity, the cycling and release of CO2 and methane (CH4) to the atmosphere).

The manipulation will evaluate the response of the existing biological communities to a range of warming levels from ambient to +9°C, provided via large, modified open-top enclosures. All temperatures, ambient through the +9°C warming treatment, will also be conducted at eCO2 (in the range of 800 to 900 parts per million [ppm]). Both direct and indirect effects of these experimental perturbations will be analyzed to develop and refine models needed for full Earth system analyses.
Supplemental_Information:
A more complete metadata document is available from the Oak Ridge repository holding these data.

The original date of this metadata file was 05/03/2018. Minor metadata updates were made on 05/30/2019.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 201308
Ending_Date: 201606
Currentness_Reference:
Observed
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Description_of_Geographic_Extent:
All measurements were made at the 8.1-ha S1 bog in northern Minnesota, 40 km north of Grand Rapids, in the USDA Forest Service Marcell Experimental Forest. One set of 6 piezometers was located in each of the 17 SPRUCE plots in the S1 bog. Ten plots are part of the SPRUCE experiment, and 7 plots are ambient plots (no experimental enclosure).
Bounding_Coordinates:
West_Bounding_Coordinate: -93.45399
East_Bounding_Coordinate: -93.45261
North_Bounding_Coordinate: 47.50646
South_Bounding_Coordinate: 47.50495
Bounding_Altitudes:
Altitude_Minimum: 413.176
Altitude_Maximum: 413.042
Altitude_Distance_Units: meters
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: bog
Theme_Keyword: carbon dioxide
Theme_Keyword: pH
Theme_Keyword: calcium
Theme_Keyword: potassium
Theme_Keyword: ammonium
Theme_Keyword: nitrate
Theme_Keyword: soluble reactive phosphorus
Theme_Keyword: total nitrogen
Theme_Keyword: total organic carbon
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: biota
Theme_Keyword: climatologyMeteorologyAtmosphere
Theme:
Theme_Keyword_Thesaurus: National Research & Development Taxonomy
Theme_Keyword: Climate change
Theme_Keyword: Ecological adaptation
Theme_Keyword: Ecology, Ecosystems, & Environment
Theme_Keyword: Plant ecology
Theme_Keyword: Soil
Theme_Keyword: Inventory, Monitoring, & Analysis
Theme_Keyword: Monitoring
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Marcell Experimental Forest
Place_Keyword: Chippewa National Forest
Place_Keyword: Minnesota
Access_Constraints: These data are available through the Oak Ridge National Laboratory (ORNL) Carbon Dioxide Information Analysis Center (CDIAC).
Use_Constraints:
If you use these data in a publication, presentation, or other research product please use the following citation:

Griffiths, Natalie A.; Sebestyen, Stephen D. 2016. SPRUCE porewater chemistry data for experimental plots beginning in 2013. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee, U.S.A. https://doi.org/10.3334/CDIAC/spruce.028
Data_Set_Credit:
Research sponsored by the Office of Biological and Environmental Research within the U.S. Department of Energy’s Office of Science.

The SPRUCE experiment is a multi-year cooperative interaction among scientists of the Oak Ridge National Laboratory operated by UT-Battelle, LLC and the USDA Forest Service, Northern Research Station, Marcell Experimental Forest.
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Data_Quality_Information:
Logical_Consistency_Report:
Not applicable
Completeness_Report:
Not applicable
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Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
See the complete metadata available from the Oak Ridge National Laboratory repository.
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Metadata_Reference_Information:
Metadata_Date: 20190530
Metadata_Standard_Name: FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001.1-1999
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