Arctic LTER Database

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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.

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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 ID:2003-2004gsfluxleafN.06
Dataset Title:Percent C, Percent N and C:N ratio for leaf samples from ITEX flux survey plots for 2003-2004, Toolik Alaska.
Investigator 1: 
First Name:Gus
Last Name:Shaver
Organization:The Ecosystems Center
Address line 2:Marine Biological Laboratory
Address line 3:7 MBL St.
City:Woods Hole
State:MA
Zip Code:2543
Country:USA
Investigator 2: 
First Name:Mark
Last Name:van Wijk
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3: 
First Name:Lorna
Last Name:Street
Investigator 4: 
First Name:Brooke
Last Name:Kaye
Investigator 5: 
First Name:Jim
Last Name:Laundre
Investigator 6: 
First Name:Mathew
Last Name:Williams
Investigator 7: 
First Name:Beth
Last Name:Bernhardt
Associate Investigators:
Keywords:ITEX flux survey, foliar nitrogen, foliar carbon, C:N ratio, organic matter, biomass, inorganic nutrients
Abstract:Foliar carbon and nitrogen concentrations of the dominant species from within the ITEX flux survey plots 2003-2004. Plots were located in the Toolik Lake LTER moist acidic tussock experiment plots in Alaska; at Imnavait Creek, Alaska.

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.10005&urlTail=terrest/tracegas/data/2003-2004gsfluxleafN.csv
Data File Name 2003-2004gsfluxleafN.dat
Beginning Date 8/8/2003
End Date 8/14/2004
Number of Data Records 282
Other Files to Reference
Availability Status type 1
Quality Control Information
Maintenance Description
Log of Changes: Updated Metadata sheet
Version 6: Updated metadata form to newer version (without site sheet). CH 25Jan2013. Updated to newer metadata with site sheet. CH March 2013.
 
RESEARCH LOCATION:                                            
Location Name Toolik Imnavait Creek 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 38N, 149 degrees 34W) Imnavait Creek (68 degrees 37N, 149 degrees 18W) Alaska, U.S. 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 68.62405 68.6167 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 -149.61058 -149.31 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 719 884 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:EXPERIMENTAL DESIGN AND METHODS: (B.Kaye)

SAMPLE METHODS:
Toolik 2003
Samples of top 3 most abundant species in each plot were collected near flux plots on August 8th. C-N leaves were collected 2-2.5 weeks after last round of fluxing was completed.

C-N analysis was done on these leaves by Lorna Street at the University of Edinburgh in the fall of 2003.

Toolik/Imnavait 2004
Leaf samples were collected of the predominate 2-5 species in each flux plot. Leaf samples from the plot (or near the plot) were collected within a few days of the date that the plot was fluxed. Sometimes one group of leaves was collected to represent a group of plots when plots were from the same treatment group and vegetation type and were close together.

These leaves were ground in 2005/2006 at MBL and analyzed for C-N content by Brooke Kaye.


2003 C-N analysis
Leaf samples for C:N analysis from 2003 were processed in 2003 by Lorna Street at the University of Edinburgh, UK. Samples were ground and analysed for carbon and nitrogen concentration using CE-440 Elemental Analyser (North Chelmsford MA, USA).

2005 C-N analysis
Samples from 2004-2005 were ground and analyzed between October 2005 and April 2006 by Brooke Kaye at the Ecosystems Center in Woods Hole, MA.

Samples were briefly re-dried at 60oC (24 hours) and put in a dessicator. Smaller samples (less than ~0.3 grams, depending on leaf size) were ground for approximately one minute in the Wig-L-Bug in the grinding room at the Marine Biological Lab. Larger samples (larger than ~0.3 grams, depending on leaf size) were ground in the Retsch MM200 double grinder for approximately three minutes, or until samples were finely powdered with no remaining visible plant fibers. If leaves still had petioles attached I removed the petioles with scissors and discarded them before grinding the leaf sample. All ground samples were stored in plastic 20ml scint vials until C-N analysis could be done.

For C-N analysis, tins were packed with 3-4 milligrams of powdered leaves. One tin was packed for every sample type. Every 10th sample had a replicate sample packed from it in order to check the reproducibility of values and the uniformity of the ground sample, this is indicated by an R in the column "rep?"

After prep samples were run, leaves were analyzed in auto-run mode (non-filter type samples). After every 10 samples a blank tin and a K-factor (standard - Acetinilide) were run to check accuracy of values. Samples were run on a Perkins Elmer CHNS/O Series II analyzer, owned by the Ecosystems Center and maintained by Don Burnette in 2005/2006.


COMMENTS:

FOR MORE INFORMATION CONTACT: Gus Shaver, The Ecosystems Center, Woods Hole, MA, 02543, USA

REFERENCE CITATIONS: van Wijk M.T., Williams M. and Shaver G (2005) Tight coupling between leaf area index and foliage N content in arctic plant communities. Oecologia 142:421-427

OTHER DATA FILES TO REFERENCE:
2003-2009gsflux.dat. CO2 and H2O flux data.
2004-2009gscoversp.dat. Percent cover of flux plots by species.
2004-2009gscoverft.dat. Percent cover of flux plots by functional type.
2003-2009gsGPSandveg.dat. GPS locations and description of vegetation for flux plots.
2003-2009gscurveparameters.dat Best fit parameters describing the light response curves measured on each plot.
2003-2009gssoiltemp.dat. Soil temperature and volumetric water content for flux plots.
2003gspointframe.dat. Point intercept sampling of vegetation within flux plots 2003
2003-2009gsharvest.dat. Leaf area, biomass and CHN analysis by species for each harvest.
2003-2009gsharvestLAI-N.dat. Total LAI, Foliar N and NDVI for 20cm x 20cm harvests.

FORMAT OF DATA FILE: ASCII

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
YEAR sample year datetime   YYYY    
DATE sample date datetime   DD-MMM-YY    
SITE Toolik text        
GROUP Toolik Lake LTER, or Imnavait Creek text        
TREATMENT Control or Fertilised text        
ASSOCIATED FLUX PLOT ID lists which flux plots C-N data should be applied to text        
VEGETATION TYPE vegetation type identified by dominate species or general characteristics text        
SPECIES code for latin name of species consisting of the first three letters of genus and first three letters of species text        
FUNCTIONAL TYPE functional type to which the species belongs text        
RUN DATE date of CHN analysis datetime   DD-MMM-YY    
%C percent carbon by weight number percent      
%N percent nitrogen by weight number percent      
C:N RATIO foilar carbon per unit foilar N number number      
rep? indicates if the entry is a replicated CHN run text        
Comments comments text