Arctic LTER

Weather at Toolik

Arctic LTER Database

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 ID:	1991gsext.5
Dataset Title:	Extractable NH4-N and NO3-N (2 N KCl), PO4-P (0.025 N HCl) and pH (0.01 M CaCl2) were measured on soils from a transect along the Dalton road, Arctic LTER 1991.
Investigator 1:
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 2:
First Name:	Jim
Last Name:	Laundre
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 3:
First Name:	Knute
Last Name:	Nadelhoffer
Investigator 4:
First Name:	Anne
Last Name:	Giblin.
Associate Investigators:
Keywords:	Extractable nutrients, Nitrogen, pH, Phosphorus, arctic, soils, tundra, inorganic nutrients, organic matter
Abstract:	Extractable NH4-N and NO3-N (2 N KCl), PO4-P (0.025 N HCl) and pH (0.01 M CaCl2) were measured on soils from a transect along the Dalton road. Sites are Gus Shaver flowering sites and Arctic LTER sites.
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.1430&urlTail=terrest/bulk/data/1991gsext.csv
Data File Name	1991gsext
Beginning Date	6/22/1991
End Date	6/28/1991
Number of Data Records	150
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	DATE RECEIVED: 31Jan96 DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: 31Jan96
	Version 2: Translated metadata into Excel metada worksheet, added attribute table and title. Jan 2006 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 units to current standards. 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.

RESEARCH LOCATION:

Location Name

Toolik

Select Site or enter New One

Geographic Description

North Slope of Alaska. See file for specific locations.

Enter Description

Location Bounding Box

West Bounding Coordinate

East Bounding Coordinate

North Bounding Coordinate

South Bounding Coordinate

OR if single point location

Latitude

68.629961

In Decimal Degrees

Longitude

-149.612633

In Decimal Degrees

Elevation

719

In Meters

Link to Google Map

View on Google Map


TAXONOMIC COVERAGE:
Organisms studied

Methods:	Cores from along the Dalton Highway at site used by Gus Shaver for his flowering sites(see Shaver, G.R., et al, 1986) were taken for extractions. Cores 5.46 cm in diameter were taken to the frozen layer. Organic and mineral layers were separated and measured in the lab. Most live plants material was removed before extraction. For extractable NH4-N and NO3-N, 100 mls of KCl (2 N KCl) was added to about 20 grams wet weight of homogenized soil. For PO4-P 100 mls of 0.025 N HCl was added to about 20 grams wet weight of homogenized soil. KCl extracts were shaken for 4 hours while HCl extracts were shaken for only 5 minutes. All extracts were immediately filtered through Whatman No. 42 filter paper and anlyzed on a Technicon AAII. To measure pH, 5 grams of soil in 25 mls of 0.01 M CaCl2 was used. A subsample of soil was dryed at 50 degree C and used to convert the wet weights to oven dry weights. Notes: The Sag tussock cores were not measured. An average bulk density from soils extracted in 1992 and 1993 from the same plots was used. Reference Citations: Shaver,G. R., N. Fetcher and F. S. Chapin,III. 1986. Growthand flowering in Eriophorum vaginatum: Annual and latitudinal variation. Ecology, 67:1524-1535. CALCULATIONS variable Formula MOISTURE: (((weight of wet soil +tare)-(weight of dry soil + tare))/((weight of dry soil + tare)-tare))*100 NOTE: All missing values are indicated by a N/A

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
Date	Date of sampling	datetime		dd-mmm-yy
SITE	Site where samples taken from along the Dalton Highway at site used by Gus Shaver for his flowering sites(see Shaver, G.R., et al, 1986)	text
REP	Replicate samples taken at each site.	text
HOR	Soil horizon	text				N/A
Code	Site and microsite code: T-tussock; IT-intertussock; W-wet sedge; S-Salix/sedge; R-Riparian Shrub	text			T = tussock \| IT = intertussock \| W = wet sedge \| S = Salix/sedge \| R = Riparian Shrub	N/A
Latitude N	Latitude of site in decimal degree.	number	degree			N/A
Longitude W	Longitude of site in decimal degree.	number	degree			N/A
Elevation	Elivation in meters.	number	gramPerFourHundredthMeterSquared			N/A
Core Length	Length of each horizon in each core.	number	centimeter			N/A
Tundra type	General type of tundra	text				N/A
Moisture	Percent moisture on dry-mass basis.	number	percent			N/A
Bulk Density	Bulk density of soil (cm3)	number	gramPerCentimeterCubed			N/A
pH	pH of soil mesured in a 0.01 M CaCl2 soil solution.	number	dimensionless			N/A
ug/g NH4-N	2 N KCl extractabe ug NH4-N per gram of dry soil.	number	microgramPerGram			N/A
ug/g NO3-N	2 N KCl extractabe ug NO3-N per gram of dry soil.	number	microgramPerGram			N/A
ug/g PO4-P	0.025 HCl extracable ug PO4-P per gram of dry soil.	number	microgramPerGram			N/A
ug\|cc NH4 KCl	2 N KCl extractabe ug NH4-N per cm3 of dry soil.	number	microgramPerCentimeterCubed			N/A
ug\|cc NO3 KCL	2 N KCl extractabe ug NO3-N per cm3 of dry soil.	number	microgramPerCentimeterCubed			N/A
ug\|cc N KCl	2 N KCl extracable ug NH4-N +NO3-N per cm3 of dry soil.	number	microgramPerCentimeterCubed			N/A
ug\|cc P HCL	0.025 HCl extracable ug PO4-P per cm3 of dry soil.	number	microgramPerCentimeterCubed			N/A
g/m2 NH4-N	2 N KCl extractabe g NH4-N per meter square per horizon.	number	gramPerMeterSquared			N/A
g/m2 NO3-N	2 N KCl extractabe g NO3-N per meter square per horizon.	number	gramPerMeterSquared			N/A
g/m2 PO4-P	0.025 HCl extracable g PO4-P per meter square per horizon.	number	gramPerMeterSquared			N/A
N:P	Extractable Nitrogen to Phosphorus ratio.	number	dimensionless			N/A
Comments	Comments on individual data points.	text

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