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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.

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:1993gsbulk.07
Dataset Title: Carbon, nitrogen and phosphorus content in the seasonally thawed soils are described for four arctic tundra vegetation types located near the Toolik Field Station, Arctic LTER 1993.
Investigator 1: 
First Name:Knute
Last Name:Nadelhoffer
Organization:University of Michigan Biological Station
Address line 2:2541 Chemistry Bldg.
Address line 3:930 North University Ave.
City:Ann Arbor
State:MI
Zip Code:48109-1055
Country:USA
Investigator 2: 
First Name:GUS
Last Name:SHAVER
Organization:
Address line 2:Marine Biological Lab
Address line 3:7 MBL St
City:Woods Hole
State:Marain Biological Lab
Zip Code:02543
Country:USA
Investigator 3: 
First Name:Anne
Last Name:Giblin
Address line 2:Marine Biological Lab
Address line 3:7 MBL St
City:Woods Hole
State:Marain Biological Lab
Zip Code:02543
Country:USA
Investigator 4: 
First Name:Ed
Last Name:Rastetter
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 5: 
First Name:Jim
Last Name:Laundre
Investigator 6: 
First Name:Bonnie
Last Name:Kwiatkowski
Investigator 7: 
First Name:Georgia
Last Name:Murray
Associate Investigators:
Keywords:arctic soils, carbon, nitrogen, nitrogen to phosphorus ratio, phosphorus, tundra, inorganic nutrients, organic matter
Abstract:Carbon, nitrogen and phosphorus content in thawed soils are described for four arctic tundra vegetation types located near the Toolik Field Station.
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.1431&urlTail=terrest/bulk/data/1993gsbulk.csv
Data File Name 1993gsbulk
Beginning Date 7/24/1993
End Date 8/1/1993
Number of Data Records 24
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: STATUS: Type 1 DATE RECEIVED:17Jan96 DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: NAME: Jim Laundre DATE:18Jan96
Version 2: Translated metadata into Excel metadata worksheet, added attribute table and title. Jan 2006 Jiml
version 3: Updated the metadata to the newest form (adding urls in the sheet). Nov 2007 Jiml
Version 4: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 5: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 6: Updated units to current startards. Fixed discrepency with header variable names. Updated metadata form to newer version (without site sheet). CH 24 Jan 2013. Updated to newer metadata with site 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 LTER Moist Acidic Tussock Tundra LTER Moist NonAcidic Tussock Tundra LTER Wet Sedge Tundra Block 1 LTER Heath Tundra 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 Arctic LTER, Toolik Field Station, North Slope Alaska(68 degrees 38'N, 149 degrees 34'W, elevation 760 m). Moist Acidic Tussock Tundra. Arctic LTER, Toolik Field Station, North Slope Alaska(68 degrees 38'N, 149 degrees 34'W, elevation 760 m). Moist Non-acidic Tussock Tundra. Toolik Lake LTER wet sedge (68 degrees 38'N, 149 degrees 34'W, elevation 760 m) North Slope, Alaska, U.S.A Arctic LTER, Toolik Field Station, North Slope Alaska Dry heath tundra. 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 68.6342 68.6253 68.64089 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 -149.64074 -149.6024 -149.58735 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 750 750 717 724 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 View on Google Map View on Google Map                                    
                                             
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:Soil cores were taken from Toolik
Lake LTER Tussock Tundra, Wet Sedge Tundra, Shrub Tundra and Heath sites on August 6and7 1993. All cores were taken in the control plots within each block. See Notes and Comments for how samples were processed in the field and at the Toolik field lab. Carbon and nitrogen concentrations were measured using a Perkin-Elmer CHN elemental analyzer. Total P was measured on ashed samples leached with HCl (Aspila, et al 1976).
 
Notes: TUSSOCK TUNDRA Field: We took 5 samples from 1 control plot in each of the 4 blocks located ca. .5km south of Toolik Lake. Cores (64 mm diameter, 32.17 cm2) were taken at random locations along a 5m tape laid out parallel to and within 1 m of the north boundary line of each plot. Total core depths (to permafrost or rock) and O horizon (Oiea) were recorded. Lab: Organic horizons were sometimes separated into subhorizons and sometimes not. Analyze as they were separated for moisture content, dry mass/m2, %C and %N. We can then calculate C and N per m2 from masses and percent C and N, summing values for subhorizons when necessary. Mineral soils (when present) should be treated in aggregate.
 
WET SEDGE
Field: We took 5 cores each from control plots in Block l (near Toolik Lake inlet stream on south side of lake) and in Block 3 and 4 (near the outlet stream north of Toolik Lake and the old airstrip). Cores (64 mm diam.) were taken at random locations along the 5m northern boundary of each plot. All cores were taken to permafrost unless noted in lab book. Core depths were recorded during core extraction by subtracting the length of the corer above the soil surface from the total corer length. NOTE that the plot block #4 was wetter than the other control plots. Lab: Cores were difficult to separate by horizon, often appearing uniform except for narrow bands at the top and bottom. Most cores were divided into 3 equal lengths for analysis. Some cores from block #4 were divided into only 2 (or not divided) length because of the high water content and low dry mass.
 
SHRUB TUNDRA
Field: We took 5 samples from random locations along the North boundary of control plots in block 1 (East of old pipeline camp) and block 2 (near North end of Toolik Lake). Cores were taken to permafrost or rock and were shallower in Block 2. Organic horizon depths were determined in the field by subtracting mineral soil thickness (where present) from total core length. Lab: Organic subhorizons were easier to distinguish here than in other sites. Samples were treated similarly to Tussock Tundra soils.
 
HEATH
Field: We sampled 3 rectangular samples of O horizon from 3 random points along a 5m line located parallel to and near the south boundary of one control plot in each of 3 blocks. Samples were taken using a 16cm*25cm plywood template (400cm2). We also sampled mineral soils (no bulk densities) by taking rock-free grab samples from the 5cm of mineral soil below the O horizon samples. NOTE- soils were rocky but organic mats (O horizons) were always present ranging from 1 to 4cm thick. We recorded O horizon thicknesses at the midpoint of each side of the hole left when the rectangular samples were removed. Lab: We removed live vegetation, large roots and rhizomes and passed O horizons through 1/2 inch hardware cloth and weighed the entire 400 cm2. A subsample was then weighed for fresh weight/dry weight determination. After drying, these samples will be used for %C, %N analyses.

Calculations: NOTE: All missing values are indicated by a N/A.
 
Bulk Density: The organic or mineral layer dry weights were added together for each core and divided by the volume of the layer. The volume for the Heath site is (400 cm2*soil dry wt.) whereas the rest of the sites are (3.14*soil dry wt.*(3.2 cm)^2) where 3.14 is Pi and 3.2 is the radius of the corer. All the O and B horizons were then averaged for each site.
 
Grams per meter square: The mass for each horizon was add together in each core and then divided by the area of the core. Heath - .04 m^2 and all others - .0032 m^2.

Reference Citations: Aspila, K.I. Aspila, H. Agemian and A.S.Y. Chau. 1976 A semi-automated method for the determination of inorganic and total phosphate in sediments. Analyst, 101:187-197.
 

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Tundra type: Tussock, Wet sedge, Shrub or Heath text        
Horizon Soil horizon including subhorizons O - indicate organic horizon; B - mineral B horizon text        
No. Number of samples. text        
Depth Average depth of horizon. number centimeter     #N/A=Missing or Not Measured
Bulk Density Average bulk density of each horizon. number gramPerCentimeterCubed     #N/A=Missing or Not Measured
%C avg Average percent carbon based on 50 C oven dry soil number percent     #N/A=Missing or Not Measured
%C serr Standard error of the mean for % carbon number percent     #N/A=Missing or Not Measured
gC/m2avg Average grams of carbon per meter square per horizon gramscarbonpersquaremeter number gramPerMeterSquared     #N/A=Missing or Not Measured
gC/m2serr Standard error of the mean for gC/m2. gramscarbonpersquaremeter number gramPerMeterSquared     #N/A=Missing or Not Measured
%N avg Average percent Nitrogen based on 50 C oven dry soil. percent number percent     #N/A=Missing or Not Measured
%N serr Standard error of the mean for %N. percent number percent     #N/A=Missing or Not Measured
gN/m2avg Average grams of Nitrogen per meter square per horizon. gramsNitrogenPerSquareMeter number gramPerMeterSquared     #N/A=Missing or Not Measured
gN/m2serr Standard error of the mean for gN/m2. gramsNitrogenPerSquareMeter number gramPerMeterSquared     #N/A=Missing or Not Measured
%P avg Average percent Phosphorus based on 50 C oven dry soil. percent number percent     #N/A=Missing or Not Measured
%P serr Standard error of the mean for %P. percent number percent     #N/A=Missing or Not Measured
gP/m2avg Average grams of Phosphorus per meter square per layer. gramsPhosphorusPerSquareMeter number gramPerMeterSquared     #N/A=Missing or Not Measured
gP/m2serr Standard error of the mean for gP/m2. gramsPhosphorusPerSquareMeter number gramPerMeterSquared     #N/A=Missing or Not Measured
C/N Ratio between % Carbon and % Nitrogen. dimensionless number dimensionless     #N/A=Missing or Not Measured
N/P Ratio between % Nitrogen and % Phosphorus. dimensionless number dimensionless     #N/A=Missing or Not Measured
Comments Notes on individual data points. text        

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