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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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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Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	1993gsbulk.6
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, N/P ratios, 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.

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

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

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

Longitude

-149.61058

-149.64074

-149.6024

-149.58735

In Decimal Degrees

Elevation

750

717

724

In Meters

Link to 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 percents 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 16cm25cm 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 cm2soil dry wt.) where as the rest of the sites are ( 3.14soil 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
Bulk Density	Average bulk density of each horizon.	number	gramPerCentimeterCubed			#N/A
%C avg	Average percent carbon based on 50 C oven dry soil	number	percent			#N/A
%C serr	Standard error of the mean for % carbon	number	percent			#N/A
gC/m2avg	Average grams of carbon per meter square per horizon gramscarbonpersquaremeter	number	gramPerMeterSquared			#N/A
gC/m2serr	Standard error of the mean for gC/m2. gramscarbonpersquaremeter	number	gramPerMeterSquared			#N/A
%N avg	Average percent Nitrogen based on 50 C oven dry soil. percent	number	percent			#N/A
%N serr	Standard error of the mean for %N. percent	number	percent			#N/A
gN/m2avg	Average grams of Nitrogen per meter square per horizon. gramsNitrogenPerSquareMeter	number	gramPerMeterSquared			#N/A
gN/m2serr	Standard error of the mean for gN/m2. gramsNitrogenPerSquareMeter	number	gramPerMeterSquared			#N/A
%P avg	Average percent Phosphorus based on 50 C oven dry soil. percent	number	percent			#N/A
%P serr	Standard error of the mean for %P. percent	number	percent			#N/A
gP/m2avg	Average grams of Phosphorus per meter square per layer. gramsPhosphorusPerSquareMeter	number	gramPerMeterSquared			#N/A
gP/m2serr	Standard error of the mean for gP/m2. gramsPhosphorusPerSquareMeter	number	gramPerMeterSquared			#N/A
C/N	Ratio between % Carbon and % Nitrogen. dimensionless	number	dimensionless			#N/A
N/P	Ratio between % Nitrogen and % Phosphorus. dimensionless	number	dimensionless			#N/A
Comments	Notes on individual data points.	text

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