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Eight Mile Lake Research Watershed, Thaw Gradient: Annual decomposition of a common substrate, 2004-2018

General Information
Data Package:
Local Identifier:knb-lter-bnz.507.17
Title:Eight Mile Lake Research Watershed, Thaw Gradient: Annual decomposition of a common substrate, 2004-2018
Alternate Identifier:DOI PLACE HOLDER
Abstract:

In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and decomposition in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems. This data set is annual (September through September) mass loss of cellulose filter paper at 0-10 cm and 10-20 cm depths in the soil profile in sites with minimal, moderate, and extensive degrees of permafrost thaw.

Short Name:knb-lter-bnz.507.17
Publication Date:2019-11-20
For more information:
Visit: http://www.lter.uaf.edu/data/data-detail/id/507

Time Period
Begin:
2004-09-01
End:
2018-09-01

People and Organizations
Contact:Data Manager (Bonanza Creek LTER) [  email ]
Creator:Pegoraro, Elaine F. (Ph.D. Student)
Creator:Hicks-Pries, Caitlin Elizabeth 
Creator:Schuur, Edward A.G. (Senior Investigator)
Organization:Bonanza Creek LTER

Data Entities
Data Table Name:
507_AnnualDecomposition_Gradient_2004-2018.csv
Description:
This dataset contains annual mass loss (%) from a cellulose decomposition bag study
Detailed Metadata

Data Entities

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-bnz/507/17/9bb73481eb016ecf29ae389e581650ed
Name:507_AnnualDecomposition_Gradient_2004-2018.csv
Description:This dataset contains annual mass loss (%) from a cellulose decomposition bag study
Number of Columns:5

Table Structure
Object Name:507_AnnualDecomposition_Gradient_2004-2018.csv
Text Format:
Number of Header Lines:1
Record Delimiter:\n
Line Delimiter:\n
Orientation:column
Simple Delimited:
Field Delimiter:,

Table Column Descriptions
 DateSiteDepthLocationMass_loss
Column Name:Date  
Site  
Depth  
Location  
Mass_loss  
Definition:The year the decomposition bags were incubated (Sept to Sept)Name of site where decomposition bag was incubatedThe depth the filter paper was incubated at in the soil profileLocation within a site that the decomposition bags were incubated atThe percent of mass that was lost from the filter paper during the year-long incubation
Storage Type:string  
string  
string  
string  
float  
Measurement Type:nominalnominalnominalnominalratio
Measurement Values Domain:
DefinitionThe year the decomposition bags were incubated (Sept to Sept)
DefinitionName of site where decomposition bag was incubated
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code10
Definition 0-10 cm; 20= 10-20 cm
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeWGW
Definitionwhite gas well
Source
Code Definition
CodeWGW
Definitionwhite gas well
Source
Unitpercent
Typereal
Missing Value Code:        
CodeNA
ExplMissing Value
Accuracy Report:          
Accuracy Assessment:          
Coverage:          
Methods:          

Data Package Usage Rights

Data Use

This work has been produced as part of the Long Term Ecological Research Program and data users should adhere to the Data Use Agreement of the Long Term Ecological Research Network.

Citation

It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User should 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(s), Year of Data Publication, Title of Dataset, Publisher, Dataset identifier, Dataset URL, Dataset DOI. For Example: Van Cleve, Keith; Chapin, F. Stuart; Ruess, Roger W. 2016. Bonanza Creek Experimental Forest: Hourly Temperature (sample, min, max) at 50 cm and 150 cm from 1988 to Present, Bonanza Creek LTER - University of Alaska Fairbanks. BNZ:1, http://www.lter.uaf.edu/data/data-detail/id/1. doi:10.6073/pasta/725db90d86686be13e6d6b2da5d61217.

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 are provided by the Bonanza Creek LTER, a partnership between the University of Alaska Fairbanks, and the U.S. Forest Service. Significant funding for collection of these data was provided by the National Science Foundation Long-Term Ecological Research program (NSF Grant numbers DEB-1636476, DEB-1026415, DEB-0620579, DEB-0423442, DEB-0080609, DEB-9810217, DEB-9211769, DEB-8702629) and by the USDA Forest Service, Pacific Northwest Research Station (Agreement # RJVA-PNW-01-JV-11261952-231).

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.

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.

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 in its present condition. 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.

Keywords

By Thesaurus:
Decompositiondecomposition, permafrost, litterbags, tundra, warming, carbon

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package
Description:

Experimental Design

The study site at the Eight Mile Lake watershed is located in the northern foothills of the Alaska Range. Permafrost temperature has been monitored annually on a gentle north-facing slope at this site, in a 30 m deep borehole that was installed in 1985 before the permafrost started to thaw. While permafrost thaw can sometimes result in water ponding depending on local topography, this landscape consists largely of relatively well-drained uplands. In this watershed, we monitored three sites that represented differing amounts of change as a result of permafrost thaw based on observations of ground subsidence and depth of thaw. Our minimal thaw site had the shallowest summer thaw depth and the least ground surface subsidence, and the vegetation was typical moist acidic tundra, dominated by the tussock-forming sedge, Eriophorum vaginatum, with coexisting deciduous and evergreen shrubs, and an understory of mosses and lichens. A second site, located adjacent to the borehole, had moderate summer thaw depths and increased ground subsidence. Here the vegetation composition was similar to our minimal thaw site, but with increased biomass of all plant groups. Lastly, an extensive thaw site was located in an area where permafrost degradation had occurred at least several decades prior to the establishment of the borehole; thermokarst can already be observed in air photos of the area taken in 1954. This site had the deepest summer thaw depth and the most ground subsidence, and the plant biomass has shifted to dominance by shrubs, including blueberry (Vaccinium uliginosum) and cloudberry (Rubus chamaemorus), at the expense of sedges. Ten decomposition bags were incubated at each gradient site each year.

Methods

FIELD: Four individually-weighed 7.5 by 7.5 cm squares of cellulose filter paper (Fisher brand P8 09-802-1B) were placed into 21 by 21 cm fiberglass mesh bags. The bags were designed to measure decomposition at 0-10 cm and from 10-20 cm. Decomposition bags were placed into the soil vertically in September into a slit cut with a bread knife. They were left to incubate in the soil for a year and collected the following September. Each of the three thaw gradient sites had 10 bags each year. The incubations started in September 2004 and are continuing. This dataset includes 2004 through September 2014. LAB: After the incubation, the bags were rinsed, dried at 60 degrees C and each filter was cleaned of debris with paintbrushes and tweezers before measuring its final weight. For each filter paper, we calculated a percent mass loss by subtracting the final from the initial weight and dividing by 100. Mass loss of the two horizontally adjacent filters was averaged to get one number per depth per bag.

Sampling Area and Study Extent
Sampling Description:

Sampling Frequency

Annually

Sampling Extent:
Sampling Site: 
Description:EML -- Tussock tundra at treeline with permafrost thaw and thermokarst. This site is in the Eight Mile Lake Watershed, west of the town of Healy on Stampede Road, Interior Alaska. This area contains three sites on a permafrost thaw gradient and a nearby experimental snow fence manipulation.. Site alternate names:
Site Coordinates:
Longitude (degree): -149.239569Latitude (degree): 63.880708

Time Period
Begin:
2004-09-01
End:
2018-09-01

People and Organizations

Publishers:
Organization:Bonanza Creek LTER
Address:
Boreal Ecology Cooperative Research Unit ,
University of Alaska Fairbanks,
P.O. Box 756780 ,
Fairbanks, AK 99775 USA
Phone:
907-474-6364 (voice)
Phone:
907-474-6251 (fax)
Creators:
Individual: Elaine F. Pegoraro
Position:Ph.D. Student
Address:
Center for Ecosystem Science and Society, bulding 17, room 310,
Flagstaff, AZ 86011 United States
Phone:
407-412-8881 (voice)
Email Address:
epegoraro89@gmail.com
Web Address:
https://www2.nau.edu/schuurlab-p/
Individual: Caitlin Elizabeth Hicks-Pries
Individual: Edward A.G. Schuur
Position:Senior Investigator
Address:
Northern Arizona University: Ecosystem Science and Society Center (ECOSS) PO Box 5620,
Flagstaff, AZ 86011 United States
Phone:
(928) 523-8344 (voice)
Email Address:
Ted.Schuur@nau.edu
Web Address:
https://www2.nau.edu/schuurlab-p/
Organization:Bonanza Creek LTER
Address:
Boreal Ecology Cooperative Research Unit ,
University of Alaska Fairbanks,
P.O. Box 756780 ,
Fairbanks, AK 99775 USA
Phone:
907-474-6364 (voice)
Phone:
907-474-6251 (fax)
Email Address:
uaf-bnz-im-team@alaska.edu
Web Address:
http://www.lter.uaf.edu
Contacts:
Organization:Bonanza Creek LTER
Position:Data Manager
Address:
Boreal Ecology Cooperative Research Unit ,
University of Alaska Fairbanks,
P.O. Box 756780 ,
Fairbanks, AK 99775 USA
Phone:
907-474-6364 (voice)
Phone:
907-474-6251 (fax)
Email Address:
uaf-bnz-im-team@alaska.edu
Web Address:
http://www.lter.uaf.edu
Metadata Providers:
Organization:Bonanza Creek LTER
Position:Data Manager
Address:
Boreal Ecology Cooperative Research Unit ,
University of Alaska Fairbanks,
P.O. Box 756780 ,
Fairbanks, AK 99775 USA
Phone:
907-474-6364 (voice)
Phone:
907-474-6251 (fax)
Email Address:
uaf-bnz-im-team@alaska.edu
Web Address:
http://www.lter.uaf.edu

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period
Begin:
2004-09-01
End:
2018-09-01
Sampling Site: 
Description:Dataset geographic description information is unavailable. {datafile/geoCoverage is empty}
Site Coordinates:
Longitude (degree): -149.2535833Latitude (degree): 63.87836111

Project

Parent Project Information:

Title:The Bonanza Creek LTER
Personnel:
Individual: Keith Van Cleve
Organization:Bonanza Creek LTER
Position:Lead Principal Investigator
Role:Principal Investigator
Individual: F.S. Stuart Chapin
Organization:Bonanza Creek LTER
Position:Lead Principal Investigator
Address:
Department of Biology and Wildlife; Institute of Arctic Biology: University of Alaska Fairbanks 193 Arctic Health P.O. Box 757000,
Fairbanks, AK 99775 United States
Phone:
(907) 455-6408 (voice)
Phone:
(907) 474-6967 (fax)
Email Address:
terry.chapin@alaska.edu
Web Address:
http://terrychapin.org/
Role:Principal Investigator
Individual: Roger W. Ruess
Organization:Bonanza Creek LTER
Position:Lead Principal Investigator
Address:
Institute of Arctic Biology University of Alaska Fairbanks P.O. Box 757000,
Fairbanks, AK 99775-0180 United States
Phone:
(907) 474-7153 (voice)
Phone:
(907) 474-6967 (fax)
Email Address:
rwruess@alaska.edu
Web Address:
http://www.iab.uaf.edu/~roger_ruess/
Role:Principal Investigator
Funding:

NSF Grant numbers DEB-1636476, DEB-1026415, DEB-0620579, DEB-0423442, DEB-0080609, DEB-9810217, DEB-9211769, DEB-8702629

USDA Forest Service, Pacific Northwest Research Station (Agreement # RJVA-PNW-01-JV-11261952-231)

Maintenance

Maintenance:
Description:

corrections

Each percent mass loss number is an average of the mass loss of two horizontally adjacent 5 x 7.5 cm filters.

additional

Note that the annual bags for 2008-2009 are in the winter treatments only. When put into the soil in September 2008, the summer tretaments had not been set up yet.

Status

Completed

Frequency:
Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |        \___attribute 'id' = 'percent'
        |     |     |___text '\n      '
        |     |___text '\n    '
        |___text '\n  '

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