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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 via LTER Data Poral
Dataset ID:2011_MAT_89_06_NP_aggs_soil_JCM.03
Dataset Title:Soil aggregate size distribution and particulate organic matter content from Arctic LTER moist acidic tundra nutrient addition plots, Toolik Field Station, Alaska, sampled July 2011.
Investigator 1: 
First Name:John
Last Name:Moore
Organization:Natural Resource Ecology Laboratory
Address line 2:200 West Lake Street
Address line 3:
City:Fort Collins
State:CO
Zip Code:80523-1499
Country:USA
Investigator 2: 
First Name:Rodney
Last Name:Simpson
Organization:Natural Resource Ecology Laboratory
Address line 2:200 West Lake Street
City:Fort Collins
State:CO
Zip Code:80523-1499
Country:USA
Investigator 3: 
First Name:Akihiro
Last Name:Koyama
Organization:Natural Resource Ecology Laboratory
Address line 2:200 West Lake Street
City:Fort Collins
State:CO
Zip Code:80523-1499
Country:USA
Investigator 4: 
First Name:Greg
Last Name:Selby
Organization:Natural Resource Ecology Laboratory
Address line 2:200 West Lake Street
City:Fort Collins
State:CO
Zip Code:80523-1499
Country:USA
Associate Investigators:
Keywords:moist acidic tundra, soil aggregates, particulate organic matter, light fraction, tundra, soil, carbon, organic matter
Abstract:Soil aggregate size distribution, aggregate carbon and nitrogen, and light fraction carbon were determined for mineral soils in moist acidic tundra. Soil was sampled in control, and N+P plots of the Arctic LTER Moist Acidic Tundra plots established in 1989 and 2006.
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.10489&urlTail=terrest/bulk/data/2011_MAT_89_06_NP_aggs_soil_JCM.csv
Data File Name 2011_MAT_89_06_NP_aggs_soil_JCM
Beginning Date 7/1/2011
End Date 7/31/2011
Number of Data Records 17
Other Files to Reference
Availability Status Type 1
Quality Control Information
Maintenance Description
Log of Changes: Version 1 Checked in to LTER database. JimL 18Dec13
Version 2: renames the file to put JCM only on end of name. Jim L 18Dec13
Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 11Feb14
 
RESEARCH LOCATION:                  
Location Name LTER Moist Acidic Tussock Tundra LTER Low Nutrient Moist Acidic Tussock Tundra 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 Experimental Plots: Moist Acidic Tussock Tundra (MAT) Northeast corner block 1 near Toolik Field Station, North Slope, Alaska. Low Nutrient Moist Acidic Tussock Tundra (LMAT) Northeast corner Block 1 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 68.624411 68.622865 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.609589 -149.608545 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 750 758 In Meters In Meters In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map View on Google Map              
                   
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:In July 2011, soil samples were collected from control, and N+P plots from within a set of treatments in Moist Acidic Tundra plots established in 1989. A set of Control and N+P plots established on an adjacent hillslope in 2006 with both equivalent (high) and half (low) the fertilization rate of the 1989 plots were also sampled. At the time of sample collection we separated the soil into organic horizon, organic/mineral interface, and the upper 5cm of the mineral soil, and measured the depth of each layer. Field-wet mineral soil samples were broken up along fault lines and pushed through an 8 mm sieve; rocks (> 2 mm in size), live roots, and dead organic matter were removed, and what remained was air-dried. Soils were then transported to the Natural Resource Ecology Laboratory at Colorado State University for further fractionation and laboratory analysis. The sieved air-dried soils were separated into the following four water-stable aggregate size classes using techniques developed by Elliott (1986) and modified by Six et al. (1998): large (>2000 mm) and small (250-2000 mm) macroaggregates, microaggregates (53-250 mm), and a silt + clay fraction (<53 mm). Total organic carbon and nitrogen of all aggregate fractions were quantified by dry combustion using a Leco TruSpec CN analyzer (Leco Corporation, St. Joseph, Michigan). Microaggregates contained within small macroaggregates (250-2000 mm) were isolated using the method of Six et al. (2000). A 10-g subsample was placed on top of a 250-mm sieve along with fifty glass beads (4 mm diam.), shaken on a reciprocal shaker so that the macroaggregates were broken up with the aid of the beads, and washed onto a 53-mm sieve. This separation yields the following three fractions: the material remaining on the 250-mm sieve was considered to be coarse POM; aggregates passing through the 250-mm sieve but retained on the 53-mm sieve are considered occluded microaggregates isolated from macroaggregates; and material passing through the 53-mm sieve is considered clay and silt particles not associated with stable microaggregates. Occluded microaggregates were dried (65C), weighed, finely ground, and analyzed for total organic carbon content by dry combustion using a Leco TruSpec CN analyzer (Leco Corporation, St. Joseph, Michigan). Density separations were completed for small macroaggregates (250-2000 mm). Sodium polytungstate (SPT) was used to create a high-density solution to separate light from heavy fractions (HF) using the method of Six et al. (1998). Prior to each LF/HF density separation, aggregate fractions were dried (60C) then cooled to room temperature in a desiccator. Sub-samples (5 g) were added to 50-ml centrifuge tubes containing 25 ml of SPT at a density of 1.85 g cm-3, gently mixed in order to avoid aggregate disruption, topped off to 40 ml with SPT, and placed under vacuum (138 kPa) to remove air trapped within aggregates. Tubes were then centrifuged (1250 g) for 60 min to separate light from heavy fractions. Floating material, which comprises the LF, was aspirated onto a 20mm nylon filter and rinsed. Samples were dried, weighed, and analyzed for carbon content using a Carlo Erba (Milan, Italy). The silt and clay fraction was separated from sand by dispersing the HF with sodium hexametaphosphate (0.5% solution by weight), then passing the dispersed fraction through a 53 mm sieve. The carbon content of the <53mm fraction was quantified by dry combustion using a Leco TruSpec CN analyzer (Leco Corporation, St. Joseph, Michigan).

References

Elliott ET (1986) Aggregate structure and carbon, nitrogen, and phosphorus in native and cultivated soils. Soil Science Society of America Journal 50, 627-633.
Six J, Elliott ET, Paustian K, Doran JW (1998) Aggregation and soil organic matter accumulation in cultivated and native grassland soils. Soil Science Society of America Journal 62, 1367-1377.
Six J, Elliott ET, Paustian K (2000) Soil macroaggregate turnover and microaggregate formation: a mechanism for C sequestration under no-tillage agriculture. Soil Biology and Biochemistry 32, 2099-2103.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Block Arctic LTER blocks text        
Plot Array Distinguished between 1989 and 2006 plots text        
Treatment Control vs +NP treatments for each plot array text     1989 +NP = Fertilization treatment since 1989 | 2006 Low+NP = Low fertilization treatment since 2006 | 2006 High+NP = High fertilization treatment since 2006  
% >2000mm % >2000mm number percent     -9999 = missing
% 250-2000mm % 250-2000mm number percent     -9999 = missing
% 53-250mm % 53-250mm number percent     -9999 = missing
% <53mm % <53mm number percent     -9999 = missing
% of small macroaggregate >250mm % small macroaggregate mass in >250mm subfraction number percent     -9999 = missing
% of small macroaggregate 53-250mm % of small macroaggregate mass in occluded microaggregate fraction number percent     -9999 = missing
% of small macroaggregate <53mm % of small macroaggregate mass in <53mm fraction number percent     -9999 = missing
Total g light fraction/g small macroaggregate Total g light fraction/g small macroaggregate number gramPerGram     -9999 = missing
Total g <53mm g small macroaggregate Total g <53mm g small macroaggregate number gramPerGram     -9999 = missing
mg C/g >2000 mm fraction mg C/g >2000 mm fraction number milligramPerGram     -9999 = missing
mg C/g 250-2000 mm fraction mg C/g 250-2000 mm fraction number milligramPerGram     -9999 = missing
mg C/g 53-250 mm fraction mg C/g 53-250 mm fraction number milligramPerGram     -9999 = missing
mg C/g <53 mm fraction mg C/g <53 mm fraction number milligramPerGram     -9999 = missing
mg N/g >2000 mm fraction mg N/g >2000 mm fraction number milligramPerGram     -9999 = missing
mg N/g 250-2000 mm fraction mg N/g 250-2000 mm fraction number milligramPerGram     -9999 = missing
mg N/g 53-250 mm fraction mg N/g 53-250 mm fraction number milligramPerGram     -9999 = missing
mg N/g <53 mm fraction mg N/g <53 mm fraction number milligramPerGram     -9999 = missing
mg C/g occluded microaggregate mg C/g occluded microaggregate within small macroaggregate number milligramPerGram     -9999 = missing
mg N/g occluded microaggregate mg N/g occluded microaggregate within small macroaggregate number milligramPerGram     -9999 = missing
mg LF C/g LF mg LF C/g LF number milligramPerGram   LF=light fraction -9999 = missing
mg small macroaggregate <53 C/g <53 mg small macroaggregate <53 C/g <53 number milligramPerGram     -9999 = missing
mg LF C/g small macroaggregate mg LF C/g small macroaggregate number milligramPerGram   LF=light fraction -9999 = missing
mg <53 C/g small macroaggregate mg <53 C/g small macroaggregate number milligramPerGram     -9999 = missing
mg iPOM C/g small macroaggregate mg iPOM C/g small macroaggregate number milligramPerGram   iPOM=intra aggregate particulate organic matter -9999 = missing

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