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:

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.

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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:2011ARF_SoilCN_byQuad.04
Dataset Title:Below ground soil carbon and nitrogen concentrations in quadrats harvested from the Anaktuvuk River Fire site in 2011
Investigator 1: 
First Name:Mack
Last Name:Michelle
Organization:Department of Biology
Address line 2:University of Florida
Address line 3:Bartram-Carr Hall
City:Gainesville
State:FL
Zip Code:32611
Country:USA
Investigator 2: 
First Name:M. Syndonia
Last Name:Bret-Harte
Organization:Institute of Arctic Biology
Address line 2:University of Alaska Fairbanks
Address line 3:
City:Fairbanks
State:AK
Zip Code:99775-7000
Country:USA
Investigator 3: 
First Name:Gaius
Last Name:Shaver
Organization:The Ecosystem Center
Address line 2:Marine Biological Laboratory
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Investigator 4: 
First Name:James
Last Name:Laundre
Organization:The Ecosystem Center
Address line 2:Marine Biological Laboratory
Address line 3:7 MBL St.
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Associate Investigators:
Keywords:Alaska, biomass, productivity, tundra, primary production, disturbance, organic matter, burns, recovery, carbon, nitrogen
Abstract:Summarized below ground soil carbon and nitrogen concentrations measured in quadrats at three sites at and around the Anaktuvuk River Burn: severely burned, moderately burned and unburned. This data corresponds with the aboveground biomass and root biomass data files: 2011ARF_AbvgroundBiomassCN, 2011ARF_RootBiomassCN_byDepth, 2011ARF_RootBiomassCN_byQuad, 2011ARF_SoilCN_byDepth.
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.10198&urlTail=burn/terrestrial/data/2011ARF_SoilCN_byQuad.csv
Data File Name 2011ARF_SoilCN_byQuad
Beginning Date 7/24/2011
End Date 7/28/2011
Number of Data Records 30
Other Files to Reference 2011ARF_AbvgrdBiomassCN_control, 2011ARF_AbvgrdBiomassCN_mod, 2011ARF_AbvgrdBiomassCN_severe, 2011ARF_RootBiomassCN_byDepth, 2011ARF_RootBiomassCN_byQuad, 2011ARF_SoilCN_byDepth
Availability Status 1
Quality Control Information
Maintenance Description
Log of Changes: Updated Metadata sheet
Version 1: Updated metadata form to newer version (with sites sheet) CH March 2013.
Version 2 Corrected eml excel .xls -> .xlsx JimL
Version 3: updated investigator information (Dec2013-JD)
Version 4: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 15Jan14
 
RESEARCH LOCATION:                  
Location Name Unburned flux tower Moderate burn flux tower Severe burn flux Tower 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 Anaktuvuk River Fire - Unburned flux tower (Station 2309) North Slope, Alaska Anaktuvuk River Fire - Moderate burn flux tower (Station 2308 ) North Slope, Alaska Anaktuvuk River Fire - Severe burn flux tower (Station 2304 ) North Slope, Alaska 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 68.9344444444445 68.9522222222222 68.9966666666667 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -150.28 -150.28 -150.28 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation       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:The Anaktuvuk River Fire occurred in 2007 on the North Slope of Alaska. In 2008, three eddy covariance towers were established at sites representing unburned tundra, moderately burned tundra, and severely burned tundra. The three sites (unburned, moderately burned and severely burned) were harvested for analysis of biomass, carbon concentration and nitrogen concentration during the summer of 2011.

Units: Tissue mass data are expressed in g/m2 and g/m2 as indicated.

Sampling description:
Two transects at each of three sites were harvested for aboveground biomass, where transects 108 and 109 are from the unburned control site, 101 and 114 are from the severely burned site and 103 and 104 are from the moderately burned site . Quadrats measuring 10 x 40 cm were harvested every 5 meters over 50 meter transects for a total of 20 quadrats per site. Aboveground biomass is considered "within" the quadrat if it is associated with a meristem that is within the quadrat. Briefly, harvest method were as follows: the rhizome-containing soil layer was harvested by cutting around each quadrat boundary with a serrated bread knife. All aboveground live vascular plant biomass, and all live rhizomes and belowground stems within the quadrat boundaries, were separated by species. Data for aboveground biomass and further methods are explained in 2011ARF_AbvgroundBiomassCN.

For every second quadrat in a transect, two contiguous 10 x 20 cm soil monoliths were excised from the side of the pit, extending from the surface of the green moss to the surface of the mineral soil (roughly 5-30 cm depth depending on location). In addition, two cores (2.42 cm in diameter) were taken through the mineral soil from the bottom of these monoliths to the ice surface at the bottom of the thawed layer. Monoliths and cores were wrapped in tinfoil to preserve structure, returned to the field station, and refrigerated prior to analyses. Within 24 hours of collection, one monolith and one core from each location were processed for determination of microbial biomass, bulk density, moisture, and carbon (C) and nitrogen (N) concentrations in both soluble pools and solid fractions. Coarse (> 2 mm) and fine roots (< 2 mm) were separated by hand from the other monolith and core respectively. Root data and method information is available in the file 2011ARF_RootBiomassCN_byQuad and 2011ARF_RootBiomassCN_byDepth.

Soil samples from monoliths and cores were separated into depth increments of 5 to 10 cm from the surface of the layer (mineral or organic). Samples were then homogenized by hand and coarse organic materials (>2.5 cm twigs and roots) and rocks were removed. A subsample of 10 g (wet weight) homogenized soil was extracted with 2M KCl overnight, for determination of soluble DOC (dissolve organic carbon), DON (dissolved organic nitrogen), NH4+ and NO3- concentrations. A second 10 g subsample was fumigated with chloroform for 24 hours prior to extraction with 2M KCl as above, for determination of microbial biomass. Extracts were frozen prior to analysis. NH4+ and NO3- were measured using an Astoria Pacific (Astoria, Oregon) colorimetric auto analyzer, and a Shimadzu TOC-L auto analyzer with a TN unit (Columbia, Missouri) for DOC and DON. Coarse and fine soil fractions were weighed wet, dried at 70 C for 48 hours to determine dry matter content, then ground on a Wiley mill with a 40 mm sieve. Dry matter content of fine mineral soil was also determined on subsamples dried at 105C for 48 hours. For all samples dried at 70C, C and N content was measured on the same Costech Elemental Analyzer as the roots. The volume of each organic monolith layer or mineral core was calculated as depth times area minus the volume of rocks. Bulk density, C and N pools for soil fractions, and C and N pools for extracted fractions, were calculated for both mineral and organic horizons.
Bulk density, and individual increment data can be found in file 2011ARF_SoilCN_byDepth. This worksheet shows sums of the carbon concentrations by quadrat.


For further information reference:
Bret-Harte, M.S., Mack, M.C., Shaver, G.R., Huebner, D.C., Johnston, M., Johica, C.A., Pizano, M.C., Reiskind, J.A. (2013) The response of arctic vegetation and soils following the Anaktuvuk River fire of 2007. Philosophical Transactions of the Royal Society: Biological Science, Submitted.

Notes:
If no samples were present in the biomass data, zeros were used. Where calculations were not possible dots were used as place holders

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Year Year of soil harvest datetime   YYYY    
Harvest Site of harvest text        
Fire disturbance Degree of fire disturbance text        
Transect Transect, where 108 & 109 are from the unburned control site, 101 & 114 are from the severely burned site and 103 & 104 are from the moderately burned site number number     .=Missing or Not Measured
Quadrat Quadrat 1-10 for each transect number number     .=Missing or Not Measured
Depth for organic soil pools (cm) Depth to the base of the organic soil layer number centimeter     .=Missing or Not Measured
Organic SON (gN/m2) Soil organic nitrogen from solid fraction of the organic soil layer number gramPerMeterSquared     .=Missing or Not Measured
Organic SOC (gC/m2) Soil organic carbon from solid fraction of the organic soil layer number gramPerMeterSquared     .=Missing or Not Measured
Organic soil organic C:N soil organic carbon to nitrogen ratio in solid fraction of organic soil layer number number     .=Missing or Not Measured
Organic Soil coarse organic debris (gC/m2) Grams of carbon from coarse organic debris in the soil organic layer number gramPerMeterSquared     .=Missing or Not Measured
Organic Soil NH4+ (gN/m2) Grams of nitrogen as ammonium in the organic layer of soil number gramPerMeterSquared     .=Missing or Not Measured
Organic Soil NO3- (gN/m2) Grams of nitrogen as nitrate in the organic layer of soil number gramPerMeterSquared     .=Missing or Not Measured
Organic Soil DON (gN/m2) Dissolved organic nitrogen from soluble fraction (see methods) in the organic soil layer number gramPerMeterSquared     .=Missing or Not Measured
Organic Soil DOC (gC/m2) Dissolved organic carbon from soluble fraction (see methods) in the organic soil layer number gramPerMeterSquared     .=Missing or Not Measured
Organic MB-N (ugN/g ode soil) Organic soil layer microbial biomass nitrogen concentration in micrograms of nitrogen per oven dried equivalent soil number microgramPerGram     .=Missing or Not Measured
Organic MB-C (ug C/g ode soil) Organic soil layer microbial biomass carbon concentration in micrograms of nitrogen per oven dried equivalent soil number microgramPerGram     .=Missing or Not Measured
Depth for mineral soil pools (cm) Depth to the base of the mineral soil layer number centimeter     .=Missing or Not Measured
Mineral SON (gN/m2) Soil organic nitrogen from solid fraction of the mineral soil layer number gramPerMeterSquared     .=Missing or Not Measured
Mineral SOC (gC/m2) Soil organic carbon from solid fraction of the mineral soil layer number gramPerMeterSquared     .=Missing or Not Measured
Mineral soil organic C:N soil organic carbon to nitrogen ratio in solid fraction of mineral soil layer number number     .=Missing or Not Measured
Mineral Soil coarse organic debris (gC/m2) Grams of carbon from coarse organic debris in the soil mineral layer number gramPerMeterSquared     .=Missing or Not Measured
Mineral Soil NH4+ (gN/m2) Grams of nitrogen as ammonium in the mineral layer of soil number gramPerMeterSquared     .=Missing or Not Measured
Mineral Soil NO3- (gN/m2) Grams of nitrogen as nitrate in the mineral layer of soil number gramPerMeterSquared     .=Missing or Not Measured
Mineral Soil DON (gN/m2) Dissolved organic nitrogen from soluble fraction (see methods) in the mineral soil layer number gramPerMeterSquared     .=Missing or Not Measured
Mineral Soil DOC (gC/m2) Dissolved organic carbon from soluble fraction (see methods) in the mineral soil layer number gramPerMeterSquared     .=Missing or Not Measured
Mineral MB-N (ugN/g ode soil) Mineral soil layer microbial biomass nitrogen concentration in micrograms of nitrogen per oven dried equivalent soil number microgramPerGram     .=Missing or Not Measured
Mineral MB-C (ug C/g ode soil) Mineral soil layer microbial biomass carbon concentration in micrograms of nitrogen per oven dried equivalent soil number microgramPerGram     .=Missing or Not Measured
O+M Total SON (gN/m2) Sum of soil organic nitrogen in the solid fraction from mineral and organic soil layers number gramPerMeterSquared     .=Missing or Not Measured
O+M Total SOC (gC/m2) Sum of soil organic carbon in the solid fraction from mineral and organic soil layers number gramPerMeterSquared     .=Missing or Not Measured