Data Package Metadata   View Summary

Plant and litter cover estimates derived from overhead microplot photos at the CSIS study at Jornada Basin LTER, 2013-ongoing

General Information
Data Package:
Local Identifier:knb-lter-jrn.210413005.2
Title:Plant and litter cover estimates derived from overhead microplot photos at the CSIS study at Jornada Basin LTER, 2013-ongoing
Alternate Identifier:DOI PLACE HOLDER
Abstract:

This dataset contains plant and litter cover estimates derived from overhead photos collected from microplots in a long-term experiment (2013-present) of cross-scale interactions (CSIs) at the Jornada Basin LTER site in southern New Mexico, U.S.A. Experimental treatments were initiated in 2013 at 15 experimental blocks, each with 4 treatment plots: plant-scale herbicide of mesquite shrubs, patch-scale connectivity modifiers (ConMods), herbicide + ConMods, control without manipulations. Repeat, overhead (downward-looking) photographs of ten "microplots" in each plot were taken for estimation of litter, soil, and vegetation cover in the experimental treatment and control plots over time. Photographs were rotated and then cropped to provide standardized areas, and then were analyzed with USDA SamplePoint software to determine coverage by ~27 plant, litter or other cover classes on a 100 point grid. Raw and corrected cover estimates are provided. This study is ongoing and new data will be added annually. Cover estimates are derived from photos in EDI dataset knb-lter-jrn.210413004.

Short Name:CSIS_overhead_cover
Publication Date:2023-10-17
Language:English
For more information:
Visit: https://jrn.lternet.edu
Visit: DOI PLACE HOLDER

Time Period
Begin:
2013-02-13
End:
2022-08-08

People and Organizations
Contact:Information Manager (Jornada Basin LTER Program) [  email ]
Creator:Peters, Debra C (USDA-ARS Jornada Experimental Range)
Creator:Anderson, John (New Mexico State University, Jornada Basin LTER, Jornada Research Site Manager)
Associate:JRN field crew,  (Jornada Basin LTER, New Mexico State University, Jornada Basin LTER Field Crew, field data collection)

Data Entities
Data Table Name:
Overhead photo-derived cover estimates table
Description:
Plant and other ground covers extracted from overhead photos of ConMod and control microplots
Data Table Name:
Cross-scale interactions experiment treatment key
Description:
Key to the experimental treatments used in the Cross-scale interactions study, by block and plot.
Other Name:
Cross-scale interactions experiment treatment key - PDF
Description:
A PDF key to the experimental treatments used in the Cross-scale interactions study, by block and plot.
Detailed Metadata

Data Entities


Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210413005/2/4112ae216fe0d73f460bd3c27f0752db
Name:Overhead photo-derived cover estimates table
Description:Plant and other ground covers extracted from overhead photos of ConMod and control microplots
Number of Records:160731
Number of Columns:13

Table Structure
Object Name:jrn413005_oh_cover_data.csv
Size:14024699 byte
Authentication:6b74f2c700726c6039ab88c7473e3504 Calculated By MD5
Text Format:
Number of Header Lines:1
Number of Foot Lines:0
Record Delimiter:\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 Image numberImage filenameBlockPlotMicroplotImage datePhoto typeGrid sizeActual gridsizeCover typeCover countCover percentComment
Column Name:image_num_orig  
image_fname  
block  
plot  
microplot  
image_date  
photo_type  
gridsize  
actual  
cover_type  
cover_count  
cover_percent  
comment  
Definition:Image number during SamplePoint cover analysisFilename for the source image used to derive cover. Format is usually BP-MD_Dt_IMG_###r.jpg, where B=Block, P=Plot, M=Microplot, D=Photo direction (O for overhead), Dt=Photo date, ###=camera image number, r=rotated (not all photos are rotated).Experimental block in CSIS (1-15)Experimental plot (A-D)Microplot number - ten microplots were sampled per plotDate of image capturePhoto type (overhead or lateral - all lateral in this case)Full SamplePoint grid size - number of points (100 in most cases)Actual number of grid points sampled to estimate percent cover. It excludes points with "outside" and "conmod" cover categories as well as any former cover categories not included in the current ~27 categories in `cover_type`.Vegetation or other cover type observed (~27 categories)Total grid points counted with a cover of the given cover typePercent cover estimated as cover_count / actual (corrected for non-response and unrecognized cover types)Comment on image or microplot cover identifications
Storage Type:integer  
string  
integer  
string  
integer  
dateTime  
string  
float  
float  
string  
float  
float  
string  
Measurement Type:intervalnominalintervalnominalintervaldateTimenominalratiorationominalratiorationominal
Measurement Values Domain:
Unitnumber
Typeinteger
DefinitionFilename string, usually of form BlockPlot-MicroplotDirection_Date_IMG_number.jpg
Unitnumber
Typeinteger
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeA
DefinitionPlot A
Source
Code Definition
CodeB
DefinitionPlot B
Source
Code Definition
CodeC
DefinitionPlot C
Source
Code Definition
CodeD
DefinitionPlot D
Source
Unitnumber
Typeinteger
FormatYYYY-MM-DD
Precision1
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Codeoh
DefinitionOverhead microplot photo (downward looking)
Source
Code Definition
Codelat
DefinitionLateral microplot photo (looking North, East, South, or West across microplot)
Source
Unitnumber
Typereal
Unitnumber
Typereal
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Codeboerd
DefinitionDead Bouteloua eriopoda cover
Source
Code Definition
Codeunkgrs
DefinitionUnidentified grass cover
Source
Code Definition
Codeshrubd
DefinitionDead shrub cover
Source
Code Definition
Codes-shrd
DefinitionDead subshrub cover
Source
Code Definition
Codemupod
DefinitionDead Muhlenbergia porteri cover
Source
Code Definition
Codearisd
DefinitionDead Aristida spp cover
Source
Code Definition
Codedapud
DefinitionDead Dasyochloa pulchella cover
Source
Code Definition
Codepgrasd
DefinitionDead Perennial grass cover
Source
Code Definition
Codespord
DefinitionDead Sporobolus spp cover
Source
Code Definition
Codeforbd
DefinitionDead forb (broadleaf herbaceous) cover
Source
Code Definition
Codeagrasd
DefinitionDead annual grass cover
Source
Code Definition
Codeungrsd
DefinitionDead unidentified grass cover
Source
Code Definition
Codeoutside
DefinitionCover comes from outside microplot
Source
Code Definition
Codeshrub
DefinitionShrub cover
Source
Code Definition
Codelitter
DefinitionLitter cover
Source
Code Definition
Codes-shrub
DefinitionSubshrub cover
Source
Code Definition
Codeforb
DefinitionForb (broadleaf herbaceous) cover
Source
Code Definition
Codesoil
DefinitionBare soil cover
Source
Code Definition
Codeconmod
DefinitionConMod (Connectivity Modifier installation) cover
Source
Code Definition
Coderock
DefinitionRock cover
Source
Code Definition
Codemupo
DefinitionMuhlenbergia porteri cover
Source
Code Definition
Codearis
DefinitionAristida spp cover
Source
Code Definition
Codedapu
DefinitionDasyochloa pulchella cover
Source
Code Definition
Codeboer
DefinitionBouteloua eriopoda cover
Source
Code Definition
Codep-grass
DefinitionPerennial grass cover
Source
Code Definition
Codespor
DefinitionSporobolus spp cover
Source
Code Definition
Codea-grass
DefinitionAnnual grass cover
Source
Unitnumber
Typereal
Unitpercent
Typereal
Definitionany text
Missing Value Code:          
CodeNA
ExplMissing value - data not collected or otherwise unavailable
 
CodeNA
ExplMissing value - data not collected or otherwise unavailable
CodeNA
ExplMissing value - data not collected or otherwise unavailable
 
CodeNA
ExplMissing value - data not collected or otherwise unavailable
CodeNA
ExplMissing value - data not collected or otherwise unavailable
CodeNA
ExplNo comment, quality flag, or additional information available
Accuracy Report:                          
Accuracy Assessment:                          
Coverage:                          
Methods:                          

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210413005/2/c031e27b400d8af6fd13786c1eff0983
Name:Cross-scale interactions experiment treatment key
Description:Key to the experimental treatments used in the Cross-scale interactions study, by block and plot.
Number of Records:60
Number of Columns:5

Table Structure
Object Name:csis_treatment_key.csv
Size:3270 byte
Authentication:afbc81c88501fc526a1f1519192ba6dd Calculated By MD5
Text Format:
Number of Header Lines:1
Number of Foot Lines:0
Record Delimiter:\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 BlockPlotTreatment codeAlternate treatment codeTreatment description
Column Name:block  
plot  
treatment_code  
treatment_altcode  
treatment_description  
Definition:Experimental block in CSIS (1-15)Experimental plot (A-D)Treatment codeAlternative treatment code (used in some data files like 210413008)Description of treatment
Storage Type:integer  
string  
string  
string  
string  
Measurement Type:intervalnominalnominalnominalnominal
Measurement Values Domain:
Unitnumber
Typeinteger
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeB
DefinitionPlot B
Source
Code Definition
CodeA
DefinitionPlot A
Source
Code Definition
CodeC
DefinitionPlot C
Source
Code Definition
CodeD
DefinitionPlot D
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Codeboth
DefinitionMesquite herbicide applied and ConMods installed in 2012
Source
Code Definition
Codecontrol
DefinitionControl (no herbicide or ConMod treatments applied)
Source
Code Definition
Codeherbicide
DefinitionMesquite herbicide applied in 2012
Source
Code Definition
Codeconmod
DefinitionConMods (connectivity modifiers) installed in 2012
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Codepatch
DefinitionPatch-scale treatment - ConMods added [alternate code]
Source
Code Definition
Codeplant&patch
DefinitionPlant- and patch-scale treatment - herbicide applied AND ConMods added [alternate code]
Source
Code Definition
Codeplant
DefinitionPlant-scale treatment - herbicide applied [alternate code]
Source
Code Definition
Codecontrol
DefinitionControl (no herbicide or ConMod treatments applied)
Source
Definitionany text
Missing Value Code:          
Accuracy Report:          
Accuracy Assessment:          
Coverage:          
Methods:          

Non-Categorized Data Resource

Name:Cross-scale interactions experiment treatment key - PDF
Entity Type:otherEntity
Description:A PDF key to the experimental treatments used in the Cross-scale interactions study, by block and plot.
Physical Structure Description:
Object Name:Study413_CSIS_Plot_Treatments.pdf
Size:21619 byte
Authentication:eafb531cd7f7d0fc82636aaf304a86aa Calculated By MD5
Externally Defined Format:
Format Name:PDF
Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210413005/2/1f0a37ee1edd53a9405ee336f3cd621c

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
LTER Controlled Vocabulary v1canopy cover, deposition, deserts, land cover, litter, litterfall, plant cover, plant functional types, revegetation
noneaeolian processes, connectivity, image analysis
Jornada Basin project namesCSIS, ConMod, LTER, study 413
Jornada Basin place namesCSIS

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 experimental design for the Cross-Scale Interactions study (CSIs) consists of 15 - 1 ha blocks spatially distributed across the study area selected to have similar total percentage vegetation cover within a block, but to vary in the proportion of perennial grass and mesquite cover among blocks. At each block location, four 15 x 25 meter experimental plots were identified with similar percentage grass and shrub cover. Within an experimental plot was a buffer area, an 8 x 8 meter treatment or control subplot (the "focal patch"), and 8 x 8 meter upwind and downwind subplots. Each experimental plot was arrayed perpendicular lengthwise to the dominant southwest to northeast wind direction, and was placed > 15 meters away from the other experimental plots to minimize between-plot treatment effects. Excluding the buffer zones, the distance between focal patches and subplots in different experimental plots ranges from > 20 to ~40 meters.

Each experimental plot within a block was randomly assigned to one of four connectivity treatments: (1) plant scale where all mesquite plants within and surrounding the focal patch were killed in place with herbicide to modify competitive interactions between woody plants and recovery of perennial grasses and other herbaceous plants with no direct effects on horizontal transport by wind and water, (2) patch scale where Connectivity Modifiers (ConMods, Okin et al. 2015) were located in bare soil interspaces between plants in the focal patch to reduce gap size and to modify transport of water, soil, nutrients, litter, and herbaceous seeds, (3) both patch- and plant-scale manipulations were conducted in each focal patch, and (4) no manipulations [controls]. Block and plot selection were completed in June 2012 followed by the characterization of initial vegetation cover in all plots in June 2013 when treatments were initiated.

Assignment of treatments to experimental plots (by block) is described in the attached files "csis_treatment_key.csv" and "Study413_CSIS_Plot_Treatments.pdf".

Overhead photo collection and analysis

In each plot (4 per block), repeat overhead photos of ten randomly selected microplots were photographed annually. Photos were taken from directly above the microplot (overhead, or downward-looking orientation) from a height of approximately 85cm above ground level using a 12.1 megapixel digital camera, resulting in image dimensions of 4,000 x 3,000 pixels. In ConMod-only and ConMod + Herbicide treatments, photos were centered over the center post of the ConMod structure, and in Control and Herbicide-only plots photos were centered over a marker nail affixed to the soil surface. Annual photos were taken in winter (Jan-Feb) from 2013-2016 to try to better distinguish perennial grass from annual plant biomass. In 2017 the method changed and photos were taken near peak biomass during the growing season (July-Sept) in order to better capture and identify living biomass. Images were archived for later analysis of plant growth and litter accumulation within the microplots.

These images were standardized and then analyzed for percent cover by approximately 27 plant, litter, and other cover categories using USDA SamplePoint software(Booth et al. 2006, Peters et al. 2020). Before cover analysis, photos were standardized by rotating and then cropping to 50 cm x 50 cm with the image centered over the footprint of the microplot. A grid of 100 points was sampled in each image and assigned to one of the 27 cover type categories. Percent cover by each category was calculated by first subtracting cover points coming from ConMod structures and outside mesquite branches from the 100 point grid to produce an "actual" total cover value, then dividing the cover points from each desired cover category by this number. Several of the cover types in the resulting data file overlap and can be summed to obtain functional group covers such as annual grasses or forbs. Data here include grid size (100), actual cover (100-(ConMods & outside branches)), grid counts by type, and percent cover by type.

References

Okin, Gregory S., Mariano Moreno-de las Heras, Patricia M. Saco, Heather L. Throop, Enrique R. Vivoni, Anthony J. Parsons, John Wainwright, and Debra P. C. Peters. 2015. "Connectivity in Dryland Landscapes: Shifting Concepts of Spatial Interactions." Frontiers in Ecology and the Environment 13 (1): 20–27. https://doi.org/10.1890/140163.

Booth, D. Terrance, Samuel E. Cox, and Robert D. Berryman. "Point sampling digital imagery with 'SamplePoint'." Environmental Monitoring and Assessment 123 (2006): 97-108.

Peters, Debra P. C., Gregory S. Okin, Jeffrey E. Herrick, Heather M. Savoy, John P. Anderson, Stacey L. P. Scroggs, and Junzhe Zhang. 2020. "Modifying Connectivity to Promote State Change Reversal: The Importance of Geomorphic Context and Plant–Soil Feedbacks." Ecology 101 (9): e03069. https://doi.org/10.1002/ecy.3069.

This method step describes provenance-based metadata as specified in the LTER EML Best Practices. This provenance metadata does not contain entity specific information.

Data Source
Repeat overhead photographs of microplots in a cross-scale interactions experiment (CSIS) at Jornada Basin LTER, 2013-ongoing

People and Organizations

Publishers:
Organization:Environmental Data Initiative
Email Address:
info@edirepository.org
Web Address:
https://edirepository.org
Id:https://ror.org/0330j0z60
Creators:
Individual: Debra C Peters
Organization:USDA-ARS Jornada Experimental Range
Email Address:
deb.peters@usda.gov
Id:https://orcid.org/0000-0002-5842-8099
Individual: John Anderson
Organization:New Mexico State University, Jornada Basin LTER
Position:Jornada Research Site Manager
Email Address:
janderso@jornada.nmsu.edu
Id:https://orcid.org/0000-0002-6417-8022
Contacts:
Organization:Jornada Basin LTER Program
Position:Information Manager
Address:
P.O. Box 30003; MSC 3JER New Mexico State University,
Las Cruces, NM 88003-8003 U.S.A.
Phone:
575-322-2430
Email Address:
jornada.data@nmsu.edu
Web Address:
https://lter.jornada.nmsu.edu/information-management/
Associated Parties:
Individual: JRN field crew
Organization:Jornada Basin LTER, New Mexico State University
Position:Jornada Basin LTER Field Crew
Address:
P.O. Box 30003; MSC 3JER New Mexico State University,
Las Cruces, NM 88003-8003 U.S.A.
Role:field data collection
Metadata Providers:
Organization:Jornada Basin LTER Program
Position:Jornada Basin LTER program
Address:
P.O. Box 30003; MSC 3JER New Mexico State University,
Las Cruces, NM 88003-8003 USA
Email Address:
jornada.lter@nmsu.edu
Web Address:
https://lter.jornada.nmsu.edu
Id:https://ror.org/05976ta47

Temporal, Geographic and Taxonomic Coverage

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

Time Period
Begin:
2013-02-13
End:
2022-08-08
Geographic Region:
Description:Basin Floor: Study occurred in the basin floor geomorphic zone in the Jornada Basin. More precise geographic coordinates for this study may be requested from the JRN LTER Data Manager (jornada.data@nmsu.edu).
Bounding Coordinates:
Northern:  32.749487Southern:  32.473173
Western:  -106.872883Eastern:  -106.692716
Taxonomic Range:
Classification:
Rank Name:kingdom
Rank Value:Plantae
Classification:
Rank Name:phylum
Classification:
Rank Name:class
Rank Value:Magnoliopsida
Classification:
Rank Name:order
Rank Value:Fabales
Classification:
Rank Name:family
Rank Value:Fabaceae
Classification:
Rank Name:genus
Rank Value:Prosopis
Classification:
Rank Name:specificEpithet
Rank Value:glandulosa
Classification:
Rank Name:kingdom
Rank Value:Plantae
Classification:
Rank Name:phylum
Classification:
Rank Name:class
Rank Value:Magnoliopsida
Classification:
Rank Name:order
Rank Value:Poales
Classification:
Rank Name:family
Rank Value:Poaceae
Classification:
Rank Name:genus
Rank Value:Bouteloua
Classification:
Rank Name:specificEpithet
Rank Value:eriopoda
Classification:
Rank Name:kingdom
Rank Value:Plantae
Classification:
Rank Name:phylum
Classification:
Rank Name:class
Rank Value:Magnoliopsida
Classification:
Rank Name:order
Rank Value:Poales
Classification:
Rank Name:family
Rank Value:Poaceae
Classification:
Rank Name:genus
Rank Value:Muhlenbergia
Classification:
Rank Name:specificEpithet
Rank Value:porteri
Classification:
Rank Name:kingdom
Rank Value:Plantae
Classification:
Rank Name:phylum
Classification:
Rank Name:class
Rank Value:Magnoliopsida
Classification:
Rank Name:order
Rank Value:Poales
Classification:
Rank Name:family
Rank Value:Poaceae
Classification:
Rank Name:genus
Rank Value:Dasyochloa
Classification:
Rank Name:specificEpithet
Rank Value:pulchella

Project

Parent Project Information:

Title:Jornada Basin LTER
Personnel:
Individual:Dr. Niall Hanan
Address:
P.O. Box 30003, MSC 3JER,
New Mexico State University,
Las Cruces, NM 88003-8003 United States
Phone:
575-646-3335 (voice)
Email Address:
nhanan@nmsu.edu
Role:Principal Investigator
Abstract:

Dryland ecosystems occupy nearly half of the Earth's land surface and provide goods and services for more than 1 billion people. The goal of the Jornada Basin Long Term Ecological Research (LTER) program is to understand what factors determine the structure and function of drylands, and to develop general principles governing changes between grassland and shrubland ecosystems. This research is based on long-term data collected in the Chihuahuan Desert. We translate our findings to dryland ecosystems around the world, and forecast the dynamics of future ecosystem states in response to changing climate and land use.

Funding:

The Jornada LTER program has been continuously funded by the U.S. National Science Foundation since 1982 (Current NSF award: DEB-2025166)

Additional Award Information:
Funder:National Science Foundation
Funder ID:https://ror.org/021nxhr62
Number:DEB 2025166
Title:LTER: Long –Term Research at the Jornada Basin (LTER VII)
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=2025166
Additional Award Information:
Funder:National Science Foundation
Number:DEB 1832194
Title:Prior award: LTER: Long - Term Research at the Jornada Basin (LTER VII)
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=1832194
Additional Award Information:
Funder:National Science Foundation
Number:DEB 1235828
Title:Prior award: LTER: Long-Term Research at the Jornada Basin (LTER-VI)
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=1235828
Additional Award Information:
Funder:National Science Foundation
Number:DEB 0618210
Title:Prior award: Jornada Basin LTER V: Landscape Linkages in Arid and Semiarid Ecosystems
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=0618210
Additional Award Information:
Funder:National Science Foundation
Number:DEB 0080412
Title:Prior award: LTER IV: Jornada Basin: Linkages in Semi-arid Landscapes
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=0080412
Additional Award Information:
Funder:National Science Foundation
Number:DEB 9411971
Title:Prior award: LTER: The Chihuahuan Desert (The Jornada LTER III Consortium)
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=9411971
Additional Award Information:
Funder:National Science Foundation
Number:DEB 8811160, 9240261
Title:Prior award: Interactions in Time and Space Variability in a Chihuahuan Desert Ecosystem: Jornada LTER (II)
Additional Award Information:
Funder:National Science Foundation
Number:DEB 8114466, 8612106
Title:Prior award: Interactions of Time and Space Variability in a Chihuahuan Desert Ecosystem in New Mexico (Jornada LTER I)

Maintenance

Maintenance:
Description:ongoing
Frequency:annually
Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'id' = 'number'
        |     |     |     |  \___attribute 'name' = 'number'
        |     |     |     |  \___attribute 'unitType' = 'dimensionless'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'a quantity or amount'
        |     |     |     |___text '\n        '
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = '%'
        |     |     |     |  \___attribute 'id' = 'percent'
        |     |     |     |  \___attribute 'multiplierToSI' = '1'
        |     |     |     |  \___attribute 'name' = 'percent'
        |     |     |     |  \___attribute 'parentSI' = 'dimensionless'
        |     |     |     |  \___attribute 'unitType' = 'dimensionless'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'percent, one part per hundred parts. a decimal ratio multipled by 100'
        |     |     |     |___text '\n        '
        |     |     |___text '\n      '
        |     |___text '\n    '
        |___text '\n  '

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

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