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:

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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.
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Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	1987_2002gsext.5
Dataset Title:	Plant available NH4, NO3, and PO4 was determined at sites near ARC LTER Toolik acidic tundra and at a toposequence along the floodplain of the Sagavanirktuk River using 2 N KCL and weak HCL extracts, Arctic LTER 1987 to 2002
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 2:
First Name:	Jim
Last Name:	Laundre
Associate Investigators:
Keywords:	Arctic tundra, plant available nutrients, nitrogen, phosphorus, bulk density, soil moisture, inorganic nutrients
Abstract:	Plant available NH4, NO3, and PO4 was determined at sites near ARC LTER Toolik acidic tundra and at a toposequence along the floodplain of the Sagavanirktuk River using 2 N KCL and weak HCL extracts. This file complies data collected at different times from 1987 through 2001 and includes initial extracts taken for buried bag method of net nitrogen mineralization.
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.1429&urlTail=terrest/bulk/data/1987_2002gsext.csv
Data File Name	1987_2002gsext
Beginning Date	6/2/1987
End Date	8/15/2003
Number of Data Records	891
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Version 2: Create Excel metadata sheet and add variable eml. Feb 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; Missing values changed to #N/A. 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

LTER Moist Acidic Tussock Tundra

Sagavanirktok River

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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.

Alaska Department of Transportation Sagavanirktok River Camp, North Slope of Alaska (68 degrees 46'N, 148 degrees 52'W)

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

68.75885

In Decimal Degrees

Longitude

-149.61058

-148.84182

In Decimal Degrees

Elevation

750

457

In Meters

Link to Google Map

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TAXONOMIC COVERAGE:
Organisms studied

Methods:	Cores (5.95cm diameter) were taken at various communities near Toolik Lake and at the toposequence at the Sagavanirktuk River. Some cores were from experimental plots: i.e. plots treated with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate) and with greenhouses and shadehouses, annually set up in late May or early June and removed at the end of August or early September.. Cores from the tussock communities were taken in moss dominated intertussock spaces. The 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. KCl extracts were shaken for 2 hours and weak HCl extracts for 5 minutes. 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 or were run on an autoanalyzer at Toolik. NO3-N extractions were either run on an autoanalyzer at Toolik or frozen and run on an autoanalyzer following LTER protocol in the fall at Woods Hole, MA. Notes: This file contains all data from the analysis, including bulk density and soil moisture calculations. See variable comments for notes on the different extractions.

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
Location	Location of plots.	text
Month	Month sampled.	text
Year	Year sampled.	text
Date	Sampling date in	datetime		dd-mmm-yyyy
Core No	Lab number for core.	text
Type	Type of cores, i.e. initial for buried bags or regular extracts.	text
Site:	Site core is from.	text
Treatment	Community or treatment plot core is from.	text
Block	Block number is aplicable.	text
Rep	Replicate number.	text
Horizon	Horizon core is from.	text
Core Dia	Diameter of core.	number	centimeter			#N/A
Can#	Soil moisture can number	text				#N/A
Canwt	Empty can weight (tare)	number	gram			#N/A
Wetwt	Wet soil plus can weight	number	gram			#N/A
Drywt	Can + soil weight after being oven dried at 60 degree C	number	gram			#N/A
KClwt	Weight of soil used for KCl extraction	number	gram			#N/A
HClwt	Weight of soil used for weak HCl extraction	number	gram			#N/A
Moisture	((wetcan -drycan)/(drycan-canwt))*100	number	percent			#N/A
Corwetwt	Core wet wt is (weight of entire core -rock weight)	number	gram			#N/A
Core area	Area of core	number	centimeterSquared			#N/A
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
Wet_Dry	(drywt-canwt)/(wetwt-canwt)	number	dimensionless			#N/A
Length	the length of the core (cm) determined by measuring the hole (excluding plants) from which the core came	number	centimeter			#N/A
NH4N um	micromoles per liter NH4-N in 100 mls 2N KCl extract shaken for 4 hrs	number	micromolePerLiter			#N/A
NO3N um	micromoles per liter NO3-N in 100 mls 2N KCl extract shaken for 4 hrs	number	micromolePerLiter			#N/A
PO4P um	micromoles per liter PO4-P in 100 mls .025 N HCl extract shaken for 5 min	number	micromolePerLiter			#N/A
NH4blank	um/l KCl blank correction for NH4 concentration.	number	micromolePerLiter			#N/A
NO3blank	um/l KCl blank correction for NO3 concentration.	number	micromolePerLiter			#N/A
PO4blank	um/l HCl blank correction for weak PO4 concentration.	number	micromolePerLiter			#N/A
NH4N ug_g	((NH4N um/l - NH4blank)100ml(1L/1000ml)/(KClwtwet_dry)14(ug/mole)	number	microgramPerGram			#N/A
NO3N ug_g	((NO3 um/l-NO3blank)100ml(1L/1000ml))/(KClwtwet_dry)14(ug/mole)	number	microgramPerGram			#N/A
PO4P ug_g	((PO4 um/l - PO4blank)100ml(1L/1000ml)/(HClwtwet_dry)31(ug/mole)	number	microgramPerGram			#N/A
NH4N g_m2	(NH4 ug_g)(BulkDens)(length)10000cm2/m20.000001g/ug	number	gramPerMeterSquared			#N/A
NO3N g/m2	(NO3 ug_g)(BulkDens)(length)10000cm2/m20.000001g/ug	number	gramPerMeterSquared			#N/A
PO4 g/m2	(PO4 ug_g)(BulkDens)(length)10000cm2/m20.000001g/ug	number	gramPerMeterSquared			#N/A
Comments	Notes and comments about the data	text

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