Data Package Metadata   View Summary

Community Response to Removals of Plant functional Groups and Species on the Jornada Experimental Range, 1997-2002

General Information
Data Package:
Local Identifier:knb-lter-jrn.210121001.52
Title:Community Response to Removals of Plant functional Groups and Species on the Jornada Experimental Range, 1997-2002
Abstract:

Arid and semi‐arid ecosystems often exhibit diverse plant growth forms in water‐limited environments, but it is unclear whether resource competition (interference) is actually important in structuring communities. We chose a diverse Chihuahuan desert shrubland to examine the response of the plant community to experimental removals of selected perennial plant species or groups of species. Four treatments involved the removal of all individuals of all species of a single functional group (functional group removals: shrub removal, succulent removal, subshrub removal, perennial grass removal). Three other treatments involved removing species within functional groups. These seven treatments plus a control (no plants removed) were replicated six times each in 25×25 m experimental plots, in summer 1995. Permanent belt transects were surveyed for number and sizes of all vascular plants in spring and fall in 1997, 1999, 2000, and 2001. Those plots from which the dominant shrub, Larrea tridentata, was removed had not recovered in total plant cover or volume by 2001, but cover and volume in all other treatments were similar to those in control plots. Relatively few species demonstrated a positive response to the removal of other species or functional groups. The perennial grass group and forbs were the most responsive; perennial grass cover increased in the shrub removal treatment relative to the control but treatment differences diminished after dry growing seasons in 2000 and 2001. Results over the first five years suggest that either environmental conditions or intrinsic biological characteristics limit the ability of most plant species to respond to the removal of substantial fractions of community biomass and composition in the short term. Such slow response by both dominant and less abundant components of the community has implications for the recovery of semi‐arid systems after human disturbance or other events leading to the reduction of biological diversity. This study is complete.
For more information, see:
Buonopane, M., Huenneke L., and Remmenga, M. 2005. Community reponses to removals of plant functional groups and species from a Chihuahuan Desert shrubland. Oikos 110:67-80.
 

Short Name:Functional
Publication Date:2012-07-11
Language:English

Time Period
Begin:
1997-05-19
End:
2002-09-26

People and Organizations
Contact:Maurer, Greg (Jornada LTER) 
Creator:Huenneke, Laura (Jornada Basin LTER, datamanager.jrn.lter@gmail.com)

Data Entities
Data Table Name:
data_JornadaStudy_121_biodiversity_vegetation_transect
Description:
Community response to removals of plant functional groups and species on the Jornada Experimental Range, 1997-2002
Detailed Metadata

Data Entities


Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210121001/52/9e051f9ca6891349d14c74a2700b1f45
Name:data_JornadaStudy_121_biodiversity_vegetation_transect
Description:Community response to removals of plant functional groups and species on the Jornada Experimental Range, 1997-2002
Number of Columns:14

Time Period
Begin:
1997-05-19
End:
2002-09-26

Table Structure
Object Name:JornadaStudy_121_biodiversity_plots_vegetation_transect_data.csv
Size:15841135
Text Format:
Number of Header Lines:33
Number of Foot Lines:0
Record Delimiter:\r\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 dateplottreatmenttransectquadspeciesdiameter 1diameter 2vertical heightconditioncountnoteserror codeoriginal record sequence number
Column Name:date  
plot  
treatment  
transect  
quad  
spp  
diam1  
diam2  
height  
condition  
count  
notes  
ec  
org_rsn  
Definition:month/day/yearplot number (values from 1-100; there are 48 plots)treatmentTransect number, west to eastQuadrat number (usually recorded as 15-1, north to south)plant species i.d. See LTER plant species list for codes.maximum diameter, in cmmaximum diameter perpendicular to first diameter, in cmvertical height, in cmcondition (live or dead)number of similar size occurrencesVtm##syy.ini where VT=vegetation transect m=(B)ook or (T)ape media ##=book or tape number s=season (F=fall; S=spring) yy=year (if 95-99, add 1900) (if 00-94, add 2000) ini=observer initialserror code-0 or 1original record sequence number
Storage Type:date  
  string  
    string  
      string  
  string  
string  
string  
Measurement Type:dateTimerationominalratiorationominalratioratiorationominalrationominalnominalnominal
Measurement Values Domain:
Formatmm/dd/yyyy
Precision
UnitN/A
Precision1
Typereal
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeC
Definitioncontrol
Source
Code Definition
CodeS
Definitionshrub removal
Source
Code Definition
CodePG
Definitionperennial grass removal
Source
Code Definition
CodeSSh
Definitionsubshrub removal
Source
Code Definition
CodeSucc
Definitionsucculent removal
Source
Code Definition
CodeSimp
Definitionsimplified
Source
Code Definition
CoderL
Definitionreduced minus Larrea
Source
Code Definition
CoderP
Definitionreduced minus Posopis
Source
UnitN/A
Precision1
Typereal
UnitN/A
Precision1
Typereal
Min
Max15 
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code*
DefinitionSee Jornada LTER Plant Species List @ https://jornada.nmsu.edu/jornada/species/lter-plants
Source
Unitcm1
Precision1
Typereal
Unitcm
Precision1
Typereal
Unitcm
Precision1
Typereal
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeL
Definitionlive
Source
Code Definition
CodeD
Definitiondead
Source
UnitN/A
Precision1
Typereal
DefinitionVtm##syy.ini where VT=vegetation transect m=(B)ook or (T)ape media ##=book or tape number s=season (F=fall; S=spring) yy=year (if 95-99, add 1900) (if 00-94, add 2000) ini=observer initials
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code0
Definitionnone
Source
Code Definition
Code1
Definitionsee history log entry
Source
Definitionoriginal record sequence number
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 AreasPopulations
Jornada Data CategoryPlant
Dataset Statuscompleted

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; tape recorder (varied by day and observer)

Description:

A 250×150 m area was located on the slope and gridded into 25×25 m plots. Plots containing conspicuous drainage channels were eliminated from use in the experiment. Remaining plots were evaluated by the use of two diagonal line – intercept transects run through each, along which the cover of specific shrub and succulent species (and of bare ground or openings) was recorded to the nearest cm. These preliminary data did not reveal any gradient from west to east (along the slope) in total vegetative cover or in the relative abundance of particular woody species. However, a gradient from south to north in P. glandulosa abundance was detected. Due to this spatial pattern in vegetative composition, and probable environmental gradients from upslope to down, we chose to use a randomized complete block design with 48 plots (8 treatments×6 blocks).
Treatments were established by the selective removal of plant species or of all species of a functional group within a plot. There are eight treatments: a control (C, no removals); four functional group removal treatments (PG, perennial grass removed; S, shrubs removed; SSh, subshrubs removed; Succ, succulents removed), and three treatments where richness within a functional group was manipulated.The latter include the simplified treatment (Simp, where only the single most abundant species of each growth form remains, while all other species of those growth forms are removed), the reduced‐Larrea treatment (rL, where the dominant of each growth form is removed, and minority components remain), and a second form of the reduced treatment (rP, where Prosopis rather than Larrea is removed as the shrub dominant).
We established treatments in summer/fall 1995. Plants were removed by cutting at the soil surface (no soil disturbance or herbicide application). Within each treatment, all plants removed from at least one plot were both field weighed and oven dried to constant weight. These data were used to construct regressions of dry weight versus live biomass weight. In the remaining plots of each treatment, removed plants were weighed in the field by species. Cumulative live mass totals for each species in each plot were used in the regressions to calculate the amount of dry mass removed. Dead material from shrubs and subshrubs was removed and weighed separately; this material was regarded as dry matter and no regression was used.

Quality Control
Quality Control Step 1: 
Description:

SAS programs were used for quality assurance and statistical analysis.

People and Organizations

Publishers:
Organization:Jornada Basin LTER, datamanager.jrn.lter@gmail.com
Web Address:
http://jornada.nmsu.edu/lter
Creators:
Individual: Laura Huenneke
Organization:Jornada Basin LTER, datamanager.jrn.lter@gmail.com
Contacts:
Individual: Greg Maurer
Organization:Jornada LTER

Temporal, Geographic and Taxonomic Coverage

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

Time Period
Begin:
1997-05-19
End:
2002-09-26
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_121_biodiversity_vegetation_transect


Time Period
Begin:
1997-05-19
End:
2002-09-26

Project

Maintenance

Maintenance:
Description:

Every fall (1 x per year) was minimum during the duration of the study.
When resources permit and vegetation seems to deserve it, spring sampling was also carried out (2 x per year).
This study is complete.

Frequency:

Additional Info

Additional Information:
 

The Plant Diversity Experiment: The experimental area is a 250 m x 250 m area located on the NMSU Chihuahuan Desert Rangeland Research Center, immediately northeast of the intersection of the Summerford powerline road and the road running along the southern boundary of the Jornada Experimental Range and the CDRRC. The area was gridded into 25 m x 25 m plots; because of some existing environmental gradients (the area slopes to the east, and mesquite abundance varies from north to south) blocks were established and treatments were randomly assigned to plots within blocks. A 15 m x 15 m study plot with a 5 m buffer area around it was established within each 25 m x 25 m plot.
Plots are oriented north-south with the west side paralleling the powerline road. There are 3 parallel, 1 m x 15 m transects per plot. Each transect is divided into 15 1-m2 quadrats. The southwest corner of Transect 1 begins at the southwest corner of the 15 m x 15 m study plot and extends north. The southwest corner of Transect 2 begins 5 meters from the southwest corner of Transect 1 along the south boundary of the 15 m x 15 m plot and extends north. The southwest corner of Transect 3 begins 10 meters from the southwest corner of Transect 1 along the south boundary of the 15 m x 15 m plot and also extends north. The transects run perpendicular to the bajada slope.

Other Metadata

Additional Metadata

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