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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.

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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 via LTER Data Poral
Dataset ID:1997lgextnuts.08
Dataset Title:Plant available NH4, NO3, and PO4 was determined at three site (LTER Toolik acidic and nonacidic tundra and Sagwon acidic tundra) and three community combinations (tussock, watertrack, and snowbed) Arctic LTER 1997.
Investigator 1: 
First Name:Laura
Last Name:Gough
Organization:Department of Biology
Address line 2:Box 19498
Address line 3:University of Texas at Arlington
City:Arlington
State:Texas
Zip Code:76019
Country:USA
Investigator 2: 
First Name:Gus
Last Name:Shaver
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3: 
First Name:Dana
Last Name:Royer
Investigator 4: 
First Name:Jim
Last Name:Laundre
Associate Investigators:
Keywords:arctic tundra, non-acidic tundra, plant available nutrients, ammonium, phosphate, pH, inorganic nutrients
Abstract:Plant available NH4, NO3, and PO4 was determined at three site (LTER Toolik acidic tundra, LTER Toolik nonacidic tundra, and Sagwon acidic tundra) and three community combinations (tussock, watertrack, and snowbed), three times during the season. pH was also determined in July and strong acid phosphorous in August.
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.1432&urlTail=terrest/bulk/data/1997lgextnuts.csv
Data File Name 1997lgextnuts
Beginning Date 6/17/1997
End Date 8/7/1997
Number of Data Records 247
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: DATE RECEIVED: 11Feb98 DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: 11Feb98
Version 2: Translated metadata into Excel metada worksheet, added attribute table and title. Jan 2006 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 the metadata form to new version and eml to 2.1.0 JimL 9Jul2012
Version 7: Replaced blank cells with "#N/A". CH 24 Jan 2013 Updated to newer metadata with site sheet. CH March 2013.
Version 8: 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 Acidic Tussock Tundra Sagwon 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 Arctic LTER, Toolik Field Station, North Slope Alaska(68 degrees 38'N, 149 degrees 34'W, elevation 760 m). Moist Acidic Tussock Tundra. nonacidic tundra near Toolik Lake(site of non-acidic LTER plots) near Sagwon (69 degrees 25' N, 148 degrees 40' W 300 m). 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 68.6342 69.4166666666667 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 -149.64074 -148.666666666667 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 760 750 300 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 View on Google Map                                      
                                             
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:

Six cores ('car exhaust pipe', 5.20cm diameter) were taken at each site/community combination in June, July, and August. Cores from the tussock communities were taken in moss dominated intertussock spaces. Cores from the Toolik acidic and nonacidic tundra were taken near the corresponding LTER plots. Sagwon is approximately 70 miles north of the Toolik Field Station along the Dalton Highway. Cores were separated into organic (O) and mineral horizons (B), with corresponding lengths recorded directly from the core hole. For NH4-N and NO3-N extractions 100mls of 2N KCl was added to approximately 20g wet set homogenized soil. A 0.025N HCl solution was used to access plant available PO4-P, and a 1N HCl solution was used to access acid digestible PO4-P. KCl extracts were shaken for 2 hours, weak HCl extracts for 5 minutes, and strong HCl extracts overnight. All extracts were immediately filtered through Whatman No. 42 filter paper. PO4-P and NH4-N extractions were hand run on a spectrophotometer (following LTER protocol) using an 5 or 1cm cell. NO3-N extractions were frozen and run on an autoanalyzer following LTER protocol in the fall at Woods Hole, MA. July cores were analyzied for soil pH. Subsampled soil was shaken for 10 minutes with .01M CaCl2 (5g soil:25mL CaCl2) and analyzed on an Orion SA 250 pH meter.

For the June and bulk of July extraction (see 'core location' column in 'raw data' worksheet for exceptions), cores were taken to bottom of thaw depth. For the August extraction, depth of thaw exceeded core length in all cases. The B horizons as noted in the worksheets are not necessary B horizons in the soil science sense. The term as used here is meant to only distinguish mineral from organic cores. Some B horizons are A or C horizons. Cores 7-10 in the tussock communities in the august extraction are tussock cores.

The 1N HCl extraction was only done in August. pH was only done in July. Echooka and May Creek are alkaline cold springs. Source cores at Echooka come from the source of the spring and poplar cores come from a poplar stand near the source. These were only done in August. pH analysis was done on these cores in August.

Reference Citations: Gough, L., G.R. Shaver, J. Carroll, D.L. Royer and J.A. Laundre. 2000.
Vascular plant species richness in Alaskan arctic tundra: the importance of soil pH. Journal of Ecology 88:54-66.
Hobbie, S.E. and L. Gough. 2002. Foliar and soil nutrients in tundra on glacial landscapes of contrasting ages in northern Alaska. Oecologia 131(3):453-462.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
DATE sampling date datetime   dd-mmm-yyyy    
Site site core is from (T=LTER acidic tussock tundra, N=LTER nonacidic tussock tundra S=Sagwon acidic tundra) text        
Community community core is from (T=tussock, W=watertrack, S=snowbed) text        
Core core number text        
Horizon horizon core is from (O=organic, B=mineral) text        
Code unique code for the sample text        
Core location location (for tussock community cores) and overlying vegetation of core. t=tussock; it=intertussock; tm=tussock margin text       #N/A=Missing or Not Measured
CAN# soil moisture can number text       #N/A=Missing or Not Measured
CANWT Empty can weight (tare) in gms number gram     #N/A=Missing or Not Measured
WETWT wet soil plus can weight in gms number gram     #N/A=Missing or Not Measured
DRYWT can + soil weight after being oven dried in gms number gram     #N/A=Missing or Not Measured
KCLWT weight of soil used for KCl extraction in gms number gram     #N/A=Missing or Not Measured
HCLWT weight of soil used for weak HCl extraction in gms number gram     #N/A=Missing or Not Measured
1N HCLWT weight of soil used for strong HCl extraction in gms number gram     #N/A=Missing or Not Measured
MOISTURE ((wetcan -drycan)/(drycan-canwt))*100 number percent     #N/A=Missing or Not Measured
corwetwt core wet wt is (weight of entire core -rock weight) in gms see original data sheet for calculation number gram     #N/A=Missing or Not Measured
BulkDens core wt wet *(drywt-canwt)/(wetwt-canwt)/(volume in cm3). Volume= pi * 2.73 (the radius in cm) ^2 * length number gramPerCentimeterCubed     #N/A=Missing or Not Measured
Dry_Wet (drywt-canwt)/(wetwt-canwt) number dimensionless     #N/A=Missing or Not Measured
length the length of the core (cm) determined by measuring the hole (excluding plants) from which the core came number centimeter     #N/A=Missing or Not Measured
NH4 um/l micromoles per liter in 100 mls 2N KCl extract shaken for 4 hrs number micromolePerLiter     #N/A=Missing or Not Measured
NO3 um/l micromoles per liter in 100 mls 2N KCl extract shaken for 4 hrs number micromolePerLiter     #N/A=Missing or Not Measured
PO4 um/l micromoles per liter in 100 mls .025 N HCl extract shaken for 5 min number micromolePerLiter     #N/A=Missing or Not Measured
1NPO4 um/l micromoles per liter in 100 mls 1N HCl extract shaken overnight number micromolePerLiter     #N/A=Missing or Not Measured
NH4blank um /l KCl blank correction for NH4 concentration. number micromolePerLiter     #N/A=Missing or Not Measured
NO3blank um /l KCl blank correction for NO3 concentration. number micromolePerLiter     #N/A=Missing or Not Measured
PO4blank um /l HCl blank correction for weak PO4 concentration. number micromolePerLiter     #N/A=Missing or Not Measured
1NPO4blk um /l HCl blank correction for strong PO4 concentration. number micromolePerLiter     #N/A=Missing or Not Measured
NH4 ug_g Conversion of um/l to ug_g = ((Concentration-blank)*(Volume of extract) * (l/ml))/(Conversion of wet wt to dry wt))*(number of g/mole). =((NH4 um/l - NH4blank)*100ml*(1L/1000ml)/(KClwt*dry_wet)*14(ug/mole) number microgramPerGram     #N/A=Missing or Not Measured
NO3 ug_g Conversion of um/l to ug_g = ((Concentration-blank)*(Volume of extract) * (l/ml))/(Conversion of wet wt to dry wt))*(number of g/mole). =((NO3 um/l-NO3blank)*100ml*(1L/1000ml))/(KClwt*dry_wet)*14(ug/mole) number microgramPerGram     #N/A=Missing or Not Measured
PO4 ug_g Conversion of um/l to ug_g = ((Concentration-blank)*(Volume of extract) * (l/ml))/(Conversion of wet wt to dry wt))*(number of g/mole). =((PO4 um/l - PO4blank)*100ml*(1L/1000ml)/(HClwt*dry_wet)*31(ug/mole) number microgramPerGram     #N/A=Missing or Not Measured
1NPO4 ug_g Conversion of um/l to ug_g = ((Concentration-blank)*(Volume of extract) * (l/ml))/(Conversion of wet wt to dry wt))*(number of g/mole). =((1NPO4 um/l - 1NPO4blk)*100ml*(1L/1000ml)/(1NHClwt*dry_wet)*31(ug/mole) number microgramPerGram     #N/A=Missing or Not Measured
NH4 g/m2 Conversion of ug_g to g/m2=(ug_g concentration)*(bulk density)*(length)*(cm2:m2 conversion)*(ug:g conversion) =(NH4 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/ug number gramPerMeterSquared     #N/A=Missing or Not Measured
NO3 g/m2 Conversion of ug_g to g/m2=(ug_g concentration)*(bulk density)*(length)*(cm2:m2 conversion)*(ug:g conversion) =(NO3 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/ug number gramPerMeterSquared     #N/A=Missing or Not Measured
PO4 g/m2 Conversion of ug_g to g/m2=(ug_g concentration)*(bulk density)*(length)*(cm2:m2 conversion)*(ug:g conversion) =(PO4 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/ug number gramPerMeterSquared     #N/A=Missing or Not Measured
1NPO4 g/m2 Conversion of ug_g to g/m2=(ug_g concentration)*(bulk density)*(length)*(cm2:m2 conversion)*(ug:g conversion) =(1NPO4 ug_g)*(BulkDens)*(length)*10000cm2/m2*0.000001g/ug number gramPerMeterSquared     #N/A=Missing or Not Measured
pH pH of sample number dimensionless     #N/A=Missing or Not Measured
N:P plant available ratio of nitrogen to phosphorus : dimensionless number dimensionless     #N/A=Missing or Not Measured
COMMENTS notes and comments about the data text        

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