Data Package Metadata   View Summary

Aggregate Mesquite Litter Chemistry Following Soil-litter Mixing and Decomposition in a Semi-arid Grassland on the Jornada Basin from 2010-2012

General Information
Data Package:
Local Identifier:knb-lter-jrn.210301001.59
Title:Aggregate Mesquite Litter Chemistry Following Soil-litter Mixing and Decomposition in a Semi-arid Grassland on the Jornada Basin from 2010-2012
Alternate Identifier:DOI PLACE HOLDER
Abstract:

Decomposition models typically under-predict decomposition relative to observed rates in drylands. This discrepancy indicates a significant gap in our mechanistic understanding of carbon and nutrient cycling in these systems. Recent research suggests that certain drivers of decomposition that are often not explicitly incorporated into models (e.g., photodegradation and soil-litter mixing; SLM) may be important in drylands, and their exclusion may, in part, be responsible for model under-predictions. To assess the role of SLM, litterbags were deployed in the Chihuahuan Desert and interrelationships between vegetation structure, SLM, and rates of decomposition were quantified. Vegetation structure was manipulated to simulate losses of grass cover from livestock grazing and shrub encroachment.We hypothesized that (i) reductions in grass cover would destabilize soils and promote SLM, and (ii) that SLM would enhance microbial abundance and alter microbial community composition in ways that accelerate decomposition. To test our hypotheses, we quantified mass loss, and chemistry of litter incubated on sites with experimental reductions in grass cover (0 to 100% removals) over a 12-month period.  This dataset includes data pertaining to the percent carbon, percent nitrogen, and the carbon to nitrogen ratio. This study is complete.

Short Name:MesquiteLitterDecomposition_Chemistry
Publication Date:2015-10-05
Language:English

Time Period
Begin:
2010-04-01
End:
2012-10-31

People and Organizations
Contact:Archer, Steven (The University of Arizona) 
Contact:Maurer, Greg (Jornada LTER,datamanager.jrn.lter@gmail.com) 
Creator:Hewins, Dan 
Associate:Archer, Steven (The University of Arizona, current responsible investigator)

Data Entities
Data Table Name:
data_Jornada_301001_aggregate_litterchem
Description:
Detailed Metadata

Data Entities


Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210301001/59/e537d7787031ea9f092800043e15a2f2
Name:data_Jornada_301001_aggregate_litterchem
Number of Columns:13

Time Period
Begin:
2010-04-01
End:
2012-10-01

Table Structure
Object Name:data_Jornada_301001_aggregate_litterchem_data.csv
Size:19423
Text Format:
Number of Header Lines:23
Number of Foot Lines:0
Record Delimiter:\r\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 yearmont of field sample collectionblockplotmicrositedurationreppercent nitrogenC_corrpashAsh NitrogenAsh CarbonC:N ratio
Column Name:year  
month  
block  
plot  
microsite  
duration  
rep  
N_corr  
C_corr  
pash  
ashN  
ashC  
CN_ratio  
Definition:year of sample field collection4=April 5=May 10=Octoberblock location in JER pasture 11A north to south (1-3)replicate plots in each block (1-3)dominant land cover where litter bags were placedCollection month of litterbag after deploymentsample replicate (1 or 2)percent nitrogen corrected by LECO standardspercent carbon corrected by LECO standardsproportion of ash finalpercent ash-corrected nitrogenpercent ask-corrected carbonRatio of carbon to nitrogen (CN=ashC/ashN)
Storage Type:date  
date  
string  
string  
string  
string  
string  
string  
string  
string  
string  
string  
string  
Measurement Type:dateTimedateTimenominalnominalnominalnominalnominalnominalnominalnominalnominalnominalnominal
Measurement Values Domain:
FormatYYYY
Precision
FormatMM
Precision
Definitionblock location in JER pasture 11A north to south (1-3)
Definitionreplicate plots in each block (1-3)
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeBare
Definitionbare ground
Source
Code Definition
CodeGrass
Definitiongrass
Source
Code Definition
CodeShrub
Definitionshrub
Source
DefinitionCollection month of litterbag after deployment
Definitionsample replicate (1 or 2)
Definitionpercent nitrogen corrected by LECO standards
Definitionpercent carbon corrected by LECO standards
Definitionproportion of ash final
Definitionpercent ash-corrected nitrogen
Definitionpercent ask-corrected carbon
DefinitionRatio of carbon to nitrogen (CN=ashC/ashN)
Missing Value Code:                          
Accuracy Report:                          
Accuracy Assessment:                          
Coverage:                          
Methods:                          

Data Package Usage Rights

Data Policies

Objectives:
    The Jornada Basin LTER Information Management System (JIMS) provides protocol and services for data collection, verification, organization, archives, and distribution in accordance with recommendations and guidelines developed by the LTER Information Managers Committee (http://www.lternet.edu/data/netpolicy.html). 
Disclaimer:
    While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is". The Jornada Basin LTER shall not be liable for damages resulting from any use or misinterpretation of data sets. 
Quality Assurance Policy:
    Data managers interact with researchers during the entire scientific process--from the initial planning of sampling designs and field data collection to archiving and distribution of data. The goal of data management is to build and maintain an archive of Jornada Basin LTER data files that are fully documented, error free, and organized in useful ways. Our protocol for data collection and processing seeks maximum interaction between researchers and data management personnel to avoid confusion and potential loss of data or problems with integrity of data; e.g., identification of historical site treatments that may impact a proposed study or incomplete data set variable descriptions. Site and Data Manager involvement begins during the Project Design phase with the completion of the Jornada Notification of Research form by the researcher prior to the start of work; this alerts both Site and Data Manager to the new study and potential LTER data sets. Upon initiation of a new study, the researcher completes Project Documentation that provides the second level of "metadata" documentation.

    In the Data Collection phase, the data manager helps researchers design field and laboratory data sheets that facilitate data entry and analysis. Prior to JIMS data entry the investigator completes Data Set Documentation to provide the metadata that fully describe the data set. Both Project and Data set documentation are provided with the data set when it is requested or obtained from our Web site. JIMS data entry programs error-check and verify data as they are entered. Computer files are subjected to further verification by graphing and/or error-checking programs, and/or examination by field investigators. Final quality assurance of the data rests with the investigator who submits data for inclusion in the Data Management System. Direct communication with the Site Manager, or through a collaborating JRN P.I., is used to encourage the timely submission of documentation and of data by researchers.

    Error-checked data files are stored with associated documentation files on the file server. Archived data files are maintained in ASCII format on 30-yr magneto-optical (MO) disks, portable hard drives, CD-R media, and DVD media to guard against loss of data access that can result from changing technology. This may also include proprietary binary format files to facilitate recovery of working versions. Image data are archived on 8mm tape. Routine tape data backups of the file server are done daily, weekly, and monthly. One set of off-site copies are maintained elsewhere on the NMSU campus of routine backup tapes, MO disks, CD disks, and DVD disks with a second set of MO, CD and DVD disks maintained off-campus in case of a catastrophe on campus. The final responsibility for quality assurance (both in data and documentation content) rests with the principal investigator who submits the data for inclusion in the Jornada Basin LTER Information Management System. To facilitate quality assurance, the data manag ement staff will provide copies of data and documentation submitted by a principal investigator to that investigator upon request.

    The final responsibility for quality assurance (both in data and documentation content) rests with the principal investigator who submits the data for inclusion in the Jornada Basin LTER Information Management System. To facilitate quality assurance, the data management staff will provide copies of data and documentation submitted by a principal investigator to that investigator upon request.
Policy on Submission of data:
    Data submission into JIMS is expected from LTER researchers, LTER collaborators, and their graduate students where data and information is derived from publicly funded research in the U.S. LTER Network, totally or partially from LTER funds from NSF, Institutional Cost-Share, or Partner Agency or Institution where a formal memorandum of understanding with LTER has been established. Other Jornada Basin researchers are encouraged to submit their documented data for inclusion within JIMS to provide them with an archived backup, ensure its longevity, and provide online access to encourage synthesis efforts. Minimally, for non-LTER associated researchers, we request that publications be provided of research conducted on the Jornada Basin.

    Initial documentation for a data set must be submitted to the Jornada Basin LTER data manager within 90 days of initiation of data collection. Documentation forms are available at http://jornada-www.nmsu.edu/site/dm/readme.php . These consist of Project Abstract and Data Set and Attribute documentation forms, which include objectives of the study, methods, as well as format and content of the data. All data collected during a calendar year should be submitted to the Jornada Basin LTER data manager prior to July first of the following year. First time data submissions must be submitted with updated standard Jornada Basin LTER forms previously submitted.
Data Access Policy:
    Data will be made publicly available no later than 2 years after submission of the data unless an earlier date is specified by the principal investigator. In the event that an extension of the 2 year period is necessary, the principal investigator may petition the Jornada Basin LTER Executive Committee for a longer protected period. Graduate student research data will be available online after degree completion and they have the opportunity to publish their research. 
Policies for re-use, distribution, or the production of derivatives:
    Data re-use, distribution and production of derivative products are governed by the LTER Network data policies (http://www.lternet.edu/data/netpolicy.html) in the spirit of having the potential to increase communication, collaboration and synthesis within and among disciplines. Appropriate citation, acknowledgement, notification and collaboration are outlined and recommended. No commercial redistribution of data and derived products are allowed.
Data Acknowledgment Policy:
    Please send notification to the Information Manager (datamanager@jornada-vmail.nmsu.edu) and Responsible Investigator(s) of the data sets you are downloading and your intended use. 
    Individuals and institutions utilizing data from the Jornada Basin LTER database are requested to place the following acknowledgment in any publication in which these data are mentioned:

        Data sets were provided by the Jornada Basin Long-Term Ecological Research (LTER) project. Funding for these data was provided by the U.S. National Science Foundation (Grant DEB-0618210).

    Please send 1 copy of any publication that cites Jornada Basin LTER data to:

         John P. Anderson
         Jornada Experimental Range
         P.O. Box 30003, MSC 3JER
         New Mexico State University
         Las Cruces, NM 88003-0003

Keywords

By Thesaurus:
Research NetworksLTAR, LTER
LTER Core AreasDisturbance, Organic Matter
Jornada Data CategoryDecomposition
Dataset Statuscompleted
Research AreaAeolian (Wind Related)

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:

Methods of recording
computer

Description:

Methodology
Litterbag contents (litter + accumulated soil) were separated using a 1 mm mesh sieve. Litter was then manually dusted using small brushes to remove additional soil from leaflets. The brushed litter was frozen at -80°C for 48 h, lyophilized for 48 h, weighed, and then ground to a fine powder using a ball mill (8000D Mixer/Mill, Spex Certiprep, Metuchen, NJ, USA). Subsamples of litter were combusted at 550°C for 6 h to determine the inorganic matter content (% ash). Mass loss and litter C and N content (elemental analyzer; ECS 4010, Costech Analytical Technologies, Valencia, CA, USA) are expressed on an ash-free basis.  The % ash was also used as a conservative index of soil accumulation that accounts only for soil adhering to litter surfaces after sieving and brushing (see Throop and Archer 2007). A large proportion of soil that infiltrates litterbags covers or mixes with litter, but does not adhere to litter surface. The mass of these ‘bulk’ soils entering or exiting litterbags is responsive to wind and water transport processes and is thus likely highly dynamic relative to that of the soil-litter films that form on litter surfaces. Quantifying the magnitude and dynamics of this ‘bulk’ component of the soil-litter matrix was beyond the scope of this study.

Quality Control
Quality Control Step 1: 
Description:

data entry program validates entries for species code and acceptable range for cover.

People and Organizations

Publishers:
Organization:Jornada Basin LTER
Web Address:
http://jornada.nmsu.edu/lter
Creators:
Individual: Dan Hewins
Contacts:
Individual: Steven Archer
Organization:The University of Arizona
Web Address:
https://orcid.org/0000-0002-5539-4129
Individual: Greg Maurer
Organization:Jornada LTER,datamanager.jrn.lter@gmail.com
Associated Parties:
Individual: Steven Archer
Organization:The University of Arizona
Web Address:
https://orcid.org/0000-0002-5539-4129
Role:current responsible investigator

Temporal, Geographic and Taxonomic Coverage

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

Time Period
Begin:
2010-04-01
End:
2012-10-31
Geographic Region:
Description:Our study site is located in the northern Chihuahuan Desert, approximately 25 km northeast of Las Cruces, New Mexico, USA (+32.6 N, -106.7 W, elevation 1315 m). Annual precipitation is 24 cm and maximum temperatures average 13 C in January and 36 C in June. Our study site includes the 78,000 ha Jornada Experimental Range operated by the USDA Agricultural Research Service (http://jornada.nmsu.edu/), and the 22,000 ha Chihuahuan Desert Rangeland Research Center (CDRRC, http://chihuahuansc.nmsu.edu/) operated by New Mexico State University (http://www.nmsu.edu/).
Bounding Coordinates:
Northern:  32.7494871Southern:  32.47317259
Western:  -106.8728831Eastern:  -106.6927163
Altitude (meter):1315

Temporal, Geographic and/or Taxonomic information that applies to Data Table: data_Jornada_301001_aggregate_litterchem


Time Period
Begin:
2010-04-01
End:
2012-10-01

Project

Maintenance

Maintenance:
Description:

Month interval from time of sample installation in field: 0, 1, 6, 12, 24, 30
0   = Apr 2010
1   = May 2010
6   = Oct 2010
12 = Apr 2011
24 = Apr 2012
30 = Oct 2012
This study is complete.

Frequency:

Additional Info

Additional Information:
 

Site Location
JER Pasture 11A Okin exclosures (see Study 228)

Other Metadata

EDI is a collaboration between the University of New Mexico and the University of Wisconsin – Madison, Center for Limnology:

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