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Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.

Disclaimer

While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data, Dataset via LTER Data Poral
Dataset ID:1994gsbflx.07
Dataset Title:Ecosystem-level Carbon dioxide fluxes in two long-term experimental wet sedge tundra sites near Toolik Lake, AK, ARC LTER 1994.
Investigator 1: 
First Name:Gus
Last Name:Shaver
Organization:Marine Biological Lab
Address line 2:7 MBL St.
Address line 3:
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Investigator 2: 
First Name:Jim
Last Name:Laundre
Organization:Marine Biological Lab
Address line 2:8 MBL St.
City:Woods Hole
State:MA
Zip Code:02544
Country:USA
Associate Investigators:
Keywords:Alaska, biomass, carbon dioxide fluxes, respiration, productivity, nitrogen, phosphorus, tundra
Abstract:Ecosystem-level Carbon dioxide fluxes were measured in two long-term experimental wet sedge tundra sites near Toolik Lake, AK. Experimental treatments at each site included factorial NxP, greenhouse and shade house and were begun in 1985 (Sag site) or in 1988 (Toolik sites). Fluxes were measured on quadrats that were later sampled for biomass and leaf area.
For questions about the Metadata and data contact the Investigators.
For information about this web site contact:
Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Email: arc_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1380&urlTail=terrest/biomass/data/1994gsbflx.csv
Data File Name 1994gsbflx
Beginning Date 7/24/1994
End Date 7/27/1994
Number of Data Records 42
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: 15Mar95 Separated comma delimited data from Excel file. JL 28Oct2004 Added units and precision to variable description section. JL
Version2: Creaded Excel metadata form. Changed title and added attribut table. 10Jan06 JimL
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Updated the metadata form to new version and eml to 2.1.0 JimL 9Jul2012
Version 6: Updated metadata to newer form (with sites sheet). Ch March 2013.
Version 7: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
 
RESEARCH LOCATION:                                            
Location Name Toolik Sagavanirktok River Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One  
Geographic Description Toolik Lake(68 degrees 38'N, 149 degrees 34'W, elevation 760 m) (68 degrees 38N, 149 degrees 34W) North Slope, Alaska, U.S.A. Sagavanirktok River (68 degrees 46'N, 148 degrees 52'W, elevation 470 m) North Slope, Alaska, U.S.A. Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description  
Location Bounding Box                                            
West Bounding Coordinate                                            
East Bounding Coordinate                                            
North Bounding Coordinate                                            
South Bounding Coordinate                                            
OR if single point location                                            
Latitude 68.6333333333333 68.7666666666667 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.566666666667 -148.866666666667 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 760 470 In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map View on Google Map                                        
                                             
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:Plots were setup as indicated below, with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate). Greenhouses and shadehouses were annually set up in late May or early June and removed in the end of August or early September.
Sites: Block 1 - Toolik Inlet (CT, N, P, NP, GH, GHNP, and Shade treatment codes)
Indicated as "Block 1"
Treatments began summer of 1989; one 5x10m
plot/treatment
Block 2 - Toolik Outlet (Same treatments)
"Block 2"
Treatments began summer of 1989; one 5x10m
plot/treatment


Calculations: Units: Tissue mass data are expressed in g/quadrat (400 cm2). Multiply by 25 to get g/m2. Leaf blade area is in cm2/quadrat. Multiply by .0025 to get m2 leaf/m2 ground.

Sampling Description.

Biomass quadrats, size 20x20 cm, were randomly located along line transects within plots. There were 4 quadrats/plot (treatment) collected in Blocks 1 and 2. All aboveground biomass plus belowground stems and rhizomes were clipped in 20x20 cm quadrats. Ecosystem-level CO2 fluxes were measured on 3 of the 4 quadrats using a LiCor 6200 Portable Photosynthesis System. A custom-made clear Plexiglas cuvette (30x30 cm surface area x 30 cm high) was placed directly over the quadrat to be sampled using the standing surface water as a seal. A standard depth was used to keep the chamber volume constant. After allowing the LiCor system to stabilize for a few seconds, 10 consecutive observations of the average CO2 flux over 20 second intervals were made. The last 6 of the 10 observations were then averaged for use as the flux measurement. Air temperature, photosynthetically active photon flux, and CO2 concentration inside the cuvette were also recorded with each observation. All flux measurements were made on a warm sunny day (26 July 1994) between 11:00 AM and 3 PM Alaska Daylight time. The cuvette was then removed briefly to allow air temperatures and CO2 concentrations to recover before being shaded with an opaque blanket for ecosystem respriation. During the unshaded measurements photon flux inside the cuvette varied from 600-2000 microE m-2 sec-1, but most measurements were made between 950-1200 micro E m-2 sec-1. Photon flux during the unshaded measurements were always less than 10 micro E m-2 sec-1, usually zero. Air temperatures were between 18o and 28o C, with most measurements made between 20o and 24o C. Concentration of CO2 inside the cuvette was 330-440 ppm, with most measurements made at 340-350 ppm.
In presenting our results, we use the unshaded (full sunlight) CO2 flux measurement as our measure of Net Ecosystem Production, or NEP. Ecosystem Respiration, or RE, is the measurement made in the darkened cuvette. Gross Ecosystem Production (=Gross Ecosystem Photosynthesis), or GEP, is the difference between NEP and RE. In this presentation, negative values represent CO2 losses to the atmosphere (RE is always negative), and positive values represent CO2 inputs (GEP is always positive).
See 1994gswsbm.txt for information on the biomass collection.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Label Quadrat label - First two characters= block number. Next characters = treatment code + rep. no. text        
Leaf Area Leaf area number centimeterSquaredPerFourHundredthMeterSquared      
LAIm2_m2 Leaf area in m2/m2 (leaf area * (10,000/400)/10,000) number meterSquaredPerMeterSquared      
IPAR Avg QNTM * (1-e^(-0.8*Leaf Area)) number dimensionless      
Blade wt Weight of leaf blade number gram      
Leaf_culm wt Ratio of leaf blade wt to culm wt number dimensionless      
Above wt Total aboveground plant biomass number gram      
Total wt Total biomass number gram      
Above(vasc) Biomass of vascular plants number gram      
NEP Net Ecosystem Production - full sunlight CO2 flux number micromolePerMeterSquaredPerSecond      
Resp Ecosystem Respiration - darken CO2 flux number micromolePerMeterSquaredPerSecond      
GEP Gross Ecosystem Production - (NEP - Resp) number micromolePerMeterSquaredPerSecond      
Avg QNTM Average photon flux inside the cuvette number micromolePerMeterSquaredPerSecond      
Avg TAIR Average air temperature inside the cuvette number celsius      
Avg CO2 Average CO2 concentration inside the cuvette number partPerMillion      

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.