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Aboveground cover and biomass across long-term precipitation and nutrient manipulation treatments at a grassland site in the Jornada Basin, 2006-ongoing

General Information
Data Package:
Local Identifier:knb-lter-jrn.210349001.1
Title:Aboveground cover and biomass across long-term precipitation and nutrient manipulation treatments at a grassland site in the Jornada Basin, 2006-ongoing
Alternate Identifier:DOI PLACE HOLDER
Abstract:

This dataset contains cover and biomass data collected starting in 2006 for a long-term precipitation and nutrient manipulation experiment at the Jornada Basin LTER site in southern New Mexico, U.S.A. This experiment uses precipitation shelters and irrigation treatments to manipulate water inputs, and fertilization treatments to alter nitrogen input to 2.5 x 2.5 meter plots in a desert grassland. Plant cover measurements are made annually in each plot, from which biomass or net primary production are derived. This is an ongoing study and the dataset will be updated yearly.

Short Name:gc_longterm_npp
Publication Date:2023-03-07
Language:English
For more information:
Visit: https://jrn.lternet.edu
Visit: DOI PLACE HOLDER

Time Period
Begin:
2006
End:
2020

People and Organizations
Contact:Information Manager (Jornada Basin LTER) [  email ]
Creator:Reichmann, Lara (Arizona State University)
Creator:Gherardi, Laureano (Arizona State University)
Creator:Sala, Osvaldo E (Arizona State University)
Associate:Sutter, Bryce (Arizona State University, field data collection)
Associate:Doucette-Riise, Stephen (Arizona State University, field data collection)
Associate:Maurer, Gregory E (Jornada Basin LTER/New Mexico State University, data analyst)

Data Entities
Data Table Name:
Cover and biomass table
Description:
Plot-level observations of grass, shrub, and total cover, and biomass calculated from those variables.
Detailed Metadata

Data Entities

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210349001/1/816cc58e65191f48e5c301e853684aea
Name:Cover and biomass table
Description:Plot-level observations of grass, shrub, and total cover, and biomass calculated from those variables.
Number of Records:82
Number of Columns:12

Table Structure
Object Name:jrn349001_cover_and_biomass.csv
Size:11091 byte
Authentication:248ed1f93f1c42c4190ec5a417cdb164 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
 YearPlot IDPrecipitation treatmentNitrogen treatmentGrass coverShrub coverRare sp. coverTotal coverGrass biomassShrub biomassRare sp. biomassTotal biomass
Column Name:year  
plotid  
ppt_trt  
n_trt  
cover_grass  
cover_shrub  
cover_rare  
cover_total  
biomass_grass  
biomass_shrub  
biomass_rare  
biomass_total  
Definition:Year of observationPlot (number)Precipitation treatment in the plotNitrogen treatment in the plotGrass coverShrub coverRare sp. coverTotal coverGrass biomassShrub biomassRare sp. biomassTotal biomass
Storage Type:integer  
integer  
string  
boolean  
float  
float  
float  
float  
float  
float  
float  
float  
Measurement Type:dateTimeintervalnominalnominalratioratioratioratioratioratioratioratio
Measurement Values Domain:
FormatYYYY
Precision1
Unitnumber
Typeinteger
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code1.8
Definition180% ambient precipitation (achieved with supplemental irrigation)
Source
Code Definition
Code0.2
Definition20% ambient precipitation (achieved with rainout shelter)
Source
Code Definition
Code1
Definitionambient precipitation (control)
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code1
Definitionammonium nitrate fertilizer applied
Source
Code Definition
Code0
Definitionno ammonium nitrate fertilizer applied
Source
Unitpercent
Typereal
Unitpercent
Typereal
Unitpercent
Typereal
Unitpercent
Typereal
UnitgramsPerSquareMeter
Typereal
UnitgramsPerSquareMeter
Typereal
UnitgramsPerSquareMeter
Typereal
UnitgramsPerSquareMeter
Typereal
Missing Value Code:                        
Accuracy Report:                        
Accuracy Assessment:                        
Coverage:                        
Methods:                        

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 Core Research Areasdisturbance, primary production
LTER Controlled Vocabulary v1annual net primary production, canopy cover, climate, droughts, net primary production, nitrogen cycling, nutrient cycling, plant cover, precipitation, rain, vegetation dynamics, water
Jornada Basin project namesstudy 349
Jornada Basin place namesPasture 13

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

This study was conducted in a Bouteloua eripoda grassland in Pasture 13 of the Jornada Experimental Range in Dona Ana County, New Mexico, USA. In 2006, 36 2.5m x 2.5m plots were established in each of three blocks on a level upland with flat slopes protected from livestock grazing since 1996. The experiment was implemented as a randomized complete block design with 2 factors: precipitation manipulation (3 levels) and nitrogen fertilization (2 levels).

The 3 levels of precipitation manipulation were 1) 80% reduced precipitation, 2) ambient precipitation, and 3) 80% increased precipitation. Reduction of 80% precipitation was achieved with rainout shelters with transparent acrylic troughs that acted like shingles. An irrigation system was used to implement the water addition treatments.

The two levels of nitrogen fertilization consisted of 1) liquid Ammonium nitrate fertilizer applied twice each growing season in mid- and late July from 2006 to 2008 (treatment), and 2) application of the same amount of water, equivalent to a 2mm rain event (controls). The ammonium nitrate fertilizer consisted of 10 grams of ammonium nitrate dissolved in water per meter per year. Treatments began in 2007.

Treatment combinations were randomly assigned to plots within each block. Six replicates were used for each treatment combination yielding total 36 plots per block.

Data collection and biomass calculation

Plant cover was sampled with a line intercept method in fall 2006 before any treatments began, then again in fall 2007 and 2008 after treatments had been applied. Within each plot, green interception by species was recorded for all plants present in the plot on 3 250cm parallel lines evenly spaced from the east border. Plant cover was later used to calculate plot biomass and then ANPP following procedures in Flombaum and Sala 2007, and Sala and Austin 2000.

Related data and publications

An earlier dataset containing 2006-2009 data from these plots is available on EDI (package ID: knb-lter-jrn.210278002), and soil moisture data from this study can be found in EDI data package knb-lter-jrn.210349002. Note that from 2006-2009 there were two additional precipitation treatments that are not included in the present dataset (+50% and -50%).

For further information and results, see:

Throop, H., L. G. Reichmann, O. Sala, and S. Archer. (2012), Response of dominant grass and shrub species to water manipulation: an ecophysical basis for shrub invasion in a Chihuahuan desert grassland. Oecologia 169: 373-383. https://doi.org/10.1007/s00442-011-2217-4

Reichmann, L. G., O. E. Sala, and D. P. C. Peters. (2013), Water controls on nitrogen transformations and stocks in an arid ecosystem. Ecosphere 4(1):11. https://doi.org/10.1890/ES12-00263.1

Reichmann, L.G., Sala, O.E. and Peters, D.P.C. (2013), Precipitation legacies in desert grassland primary production occur through previous‐year tiller density. Ecology, 94: 435-443. https://doi.org/10.1890/12-1237.1

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: Lara Reichmann
Organization:Arizona State University
Id:https://orcid.org/0000-0002-9737-7300
Individual: Laureano Gherardi
Organization:Arizona State University
Individual: Osvaldo E Sala
Organization:Arizona State University
Id:https://orcid.org/0000-0003-0142-9450
Contacts:
Organization:Jornada Basin LTER
Position:Information Manager
Phone:
575-322-2430
Email Address:
jornada.data@nmsu.edu
Web Address:
https://lter.jornada.nmsu.edu/information-management/
Associated Parties:
Individual: Bryce Sutter
Organization:Arizona State University
Role:field data collection
Individual: Stephen Doucette-Riise
Organization:Arizona State University
Role:field data collection
Individual: Gregory E Maurer
Organization:Jornada Basin LTER/New Mexico State University
Address:
P.O. Box 30003; MSC 3JER New Mexico State University,
Las Cruces, NM 88003-8003 U.S.A.
Email Address:
gmaurer@nmsu.edu
Id:https://orcid.org/0000-0002-3007-8058
Role:data analyst
Metadata Providers:
Organization:Jornada Basin LTER
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:
2006
End:
2020
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

Project

Parent Project Information:

Title:LTREB Global Change experiments at Jornada Basin LTER
Personnel:
Individual:Dr. Osvaldo Sala
Address:
School of Life Sciences and School of Sustainability,
Arizona State University,
Tempe, AZ 85287 United States
Phone:
480-965-4120 (voice)
Email Address:
osvaldo.sala@asu.edu
Role:Principal Investigator (LTREB)
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 (LTER)
Abstract:

The Global Change experiments in the Jornada Basin consist of controlled, long-term experiments designed to uncover what causes changes in grasslands with enough confidence to predict their future as they begin to experience conditions never seen before. The project expands on decade-long field experiments in which rainfall amount and variability were manipulated over multi-year timescales. Results from these experiments will yield new understanding that will provide guidance to managers of drylands in the Southwest United States, and around the world. The project is funded by the US National Science Foundation (NSF) Long Term Research in Environmental Biology, or LTREB, program.

The Global Change experiments occur in coordination with the Jornada Basin Long-Term Ecological Research program (JRN LTER). JRN LTER is part of a national network of long-term ecological research sites funded by the US National Science Foundation (NSF). The Jornada LTER program has been continuously funded since 1982 (Current NSF award: DEB-2025166) to develop general principles governing changes between grassland and shrubland ecosystems 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.

Additional Award Information:
Funder:National Science Foundation
Funder ID:https://ror.org/05976ta47
Number:1754106
Title:LTREB: Long-term ecosystem responses to directional changes in precipitation amount and variability in an arid grassland
URL:https://www.nsf.gov/awardsearch/showAward?AWD_ID=1754106
Additional Award Information:
Funder:National Science Foundation
Funder ID:https://ror.org/05976ta47
Number: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)
Additional Award Information:
Funder:National Science Foundation
Number:DEB 1235828
Title:Prior award: LTER: Long-Term Research at the Jornada Basin (LTER-VI)
Additional Award Information:
Funder:National Science Foundation
Number:DEB 0618210
Title:Prior award: Jornada Basin LTER V: Landscape Linkages in Arid and Semiarid Ecosystems

Maintenance

Maintenance:
Description:ongoing
Frequency:annually
Other Metadata

Additional Metadata

additionalMetadata
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        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'abbreviation' = 'g/m²'
        |     |     |     |  \___attribute 'id' = 'gramsPerSquareMeter'
        |     |     |     |  \___attribute 'multiplierToSI' = '0.001'
        |     |     |     |  \___attribute 'name' = 'gramsPerSquareMeter'
        |     |     |     |  \___attribute 'parentSI' = 'kilogramPerMeterSquared'
        |     |     |     |  \___attribute 'unitType' = 'arealMassDensity'
        |     |     |     |___text '\n          '
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        |     |     |     |  \___attribute 'id' = 'percent'
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        |     |     |     |  \___attribute 'name' = 'percent'
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        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'percent, one part per hundred parts. a decimal ratio multipled by 100'
        |     |     |     |___text '\n        '
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