Arctic LTER

Weather at Toolik

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.

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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.

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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

Geographic Description

Toolik Lake (68 degrees 38N, 149 degrees 34W)

Imnavait Creek (68 degrees 37N, 149 degrees 18W) Alaska, U.S.

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

Longitude

-149.61058

-149.31

In Decimal Degrees

Elevation

719

884

In Meters

Link to 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

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