Data Package Metadata   View Summary

Pre-dawn Water Potential for leaves from Reduced and Enhanced Precipitation Treatments on the Jornada Basin, 2007-2008

General Information
Data Package:
Local Identifier:knb-lter-jrn.210409002.65
Title:Pre-dawn Water Potential for leaves from Reduced and Enhanced Precipitation Treatments on the Jornada Basin, 2007-2008
Alternate Identifier:DOI PLACE HOLDER
Abstract:

 
Increases in woody vegetation and declines in grasses in arid and semi-arid ecosystems have occurred globally since the 1800s, but the mechanisms driving this major land-cover change remain uncertain and controversial. Working in a shrub-encroached grassland in the northern Chihuahuan Desert where grasses and shrubs typically differ in leaf-level nitrogen allocation, photosynthetic pathway, and root distribution, we asked if differences in leaf level ecophysiology could help explain shrub proliferation. We predicted that the relative performance of grasses and shrubs would vary with soil moisture due to the different morphological and physiological characteristics of the two life-forms. In a 2-year experiment with ambient, reduced,and enhanced precipitation during the monsoon season, respectively, the encroaching C3 shrub (honey mesquite Prosopis glandulosa) consistently and substantially outperformed the historically dominant C4 grass (black grama Bouteloua eriopoda) in terms of photosynthetic rates while also maintaining a more favorable leaf water status. This data set includes leaf water potential for each leaf measured while data on photosynthetic rates can be found in package 210409001. This study is complete. Please refer to: Throop, H., Archer, S. R. , and L. G. Reichmann. 2011. Response of dominant grass and shrub species to water manipulation: an ecophysiological basis for shrub invasion in a Chihuahuan Desert Grassland. Oecologia 169: 373-383.

Short Name:JornadaStudy_409_precipitation_treatment_predawn_leaf_water_potential_data
Publication Date:2019-06-27
Language:English

Time Period
Begin:
2007-07-25
End:
2008-09-20

People and Organizations
Contact:Manager, Data (datamanager.jrn.lter@gmail.com) 
Creator:Throop, Heather 

Data Entities
Data Table Name:
data_JornadaStudy_409_precipitation_treatments_predawn_leaf_water_potential
Description:
Data file information for the following Jornada data set: Pre-dawn water potential for leaves from 5 precipitation treatments
Detailed Metadata

Data Entities


Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210409002/65/9630843347793ce9dcec9985b762ce24
Name:data_JornadaStudy_409_precipitation_treatments_predawn_leaf_water_potential
Description:Data file information for the following Jornada data set: Pre-dawn water potential for leaves from 5 precipitation treatments
Number of Columns:5

Time Period
Begin:
2007-07-25
End:
2008-09-20

Table Structure
Object Name:JornadaStudy_409_precipitation_treatment_predawn_leaf_water_potential_data.csv
Size:7036
Text Format:
Number of Header Lines:15
Number of Foot Lines:0
Record Delimiter:\r\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 species codedateplot numberprecipitation treatmentwater potential
Column Name:spp  
date  
plot  
ppt-trt  
water-pot  
Definition:plant species measured for water potential 4-letter plant species codedate of measurement (month/day/year)Plot number established by Sala (LTER study 278)Precipitation treatment of the plotleaf water potential
Storage Type:string  
date  
  string  
 
Measurement Type:nominaldateTimerationominalratio
Measurement Values Domain:
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeBOER
DefinitionBouteloua eriopoda (black grama)
Source
Code Definition
CodePRGL
DefinitionProsopis glandulosa (mesquite)
Source
Formatmm/dd/yyyy
Precision
UnitN/A
Precision1
Typereal
Min200 
Max244 
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code-80%
Definition-80 percent reduced precipitation shelter
Source
Code Definition
Code-50%
Definition-50 percent reduced precipitation shelter
Source
Code Definition
Code0
Definitionno precipitation treatment
Source
Code Definition
Code+50%
Definition+50 percent added by sprinklers
Source
Code Definition
Code+80%
Definition+80 percent added by sprinklers
Source
Unitmegapascal
Typereal
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 AreasInorganic Nutrients, Primary Production
Jornada Dataset Keywordsclimate change, ecophysiology, plant water status, water potential,, water relations
Dataset Statuscompleted
Research AreaVegetation Dynamics

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:

- field data sheets
-Scholander type pressure bombs

Description:

 
Manipulations during the 2007–2008 growing seasons consisted of water levels of PPT relative to ambient: -80%, -50%, control, +50%, +80%, with 12 replicates per treatment.Time constraints to perform ecophysiological measurements on both black grama and mesquite simultaneously led us to measure these variables in four replicate plots for each of the PPT treatments. Plots were 2.5 X 2.5 m, and each was centered around a single mature mesquite shrub that was similar in size to other mesquite on this ecological site (mean height 0.5 m, canopy diameter 1.1 m). Shrubs were surrounded by black grama (mean basal area 11.48 cm2); black grama individuals selected for measurements were >0.75 m from plot edges. Reductions in PPT were achieved via passive rainout shelters; supplementation was achieved via a sprinkler irrigation system. Desired levels of rainfall reduction (-80 % and -50%) relative to ambient were achieved by modifying the number of transparent V-shaped acrylic strips per shelter. A PVC-pipe irrigation system was used at the enhanced PPT plots, which were irrigated the day after PPT events, with an amount of water equal to 50 or 80% of the event. Supplementation occurred during the spring and fall of 2007 and 2008 using PPT that was captured nearby and stored. Control plots received ambient PPT and had neither shelters nor irrigation systems.Leaf ecophysiology was quantified during the 2007 and 2008 growing seasons on dates with contrasting PPT patterns in the days preceding the sampling date. One mesquite and one black grama leaf from each plot (n = 20 plots; 5 PPT treatments X 4 replicate plots/treatment) were measured during the morning on two dates in 2007 (25 July and 18 August) and three dates in 2008 (21 July, 25 July, 13 August).  Predawn xylem water potential was quantifed with pressure chambers (black grama: model 1000,with 100 bar capacity; PMS Instrument Co, Corvallis, OR; mesquite: model 2005, Soil Moisture Equipment Corp,Santa Barbara, CA).

Quality Control
Quality Control Step 1: 
Description:

QA/QC: N/A Preliminary treatment of data: raw data submitted

People and Organizations

Publishers:
Organization:Jornada Basin LTER
Web Address:
http://jornada.nmsu.edu/lter
Creators:
Individual: Heather Throop
Contacts:
Individual: Data Manager
Organization:datamanager.jrn.lter@gmail.com
Metadata Providers:
Organization:Jornada Basin LTER
Web Address:
http://jornada.nmsu.edu/lter

Temporal, Geographic and Taxonomic Coverage

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

Time Period
Begin:
2007-07-25
End:
2008-09-20
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:  32.7494871013Southern:  32.4731725883
Western:  -106.87288312Eastern:  -106.692716261
Altitude (meter):1315

Temporal, Geographic and/or Taxonomic information that applies to Data Table: data_JornadaStudy_409_precipitation_treatments_predawn_leaf_water_potential


Time Period
Begin:
2007-07-25
End:
2008-09-20

Project

Maintenance

Maintenance:
Description:

Measurements were taken approximately 3 times per growing season, contingent upon precipitation. This study is complete.

Frequency:

Additional Info

Additional Information:
 

Block 2 of Sala's Global Change experiment (LTER Study 278) in Pasture 13

Other Metadata

Additional Metadata

additionalMetadata
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