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Point-Quarter Distance and Dimension Measurements to Calculate Shrub Density and Estimate Shrub ANPP in a Chihuahuan Desert Creosote Shrubland at the Sevilleta National Wildlife Refuge, New Mexico

General Information
Data Package:
Local Identifier:knb-lter-sev.201.170123
Title:Point-Quarter Distance and Dimension Measurements to Calculate Shrub Density and Estimate Shrub ANPP in a Chihuahuan Desert Creosote Shrubland at the Sevilleta National Wildlife Refuge, New Mexico
Alternate Identifier:DOI PLACE HOLDER
Abstract:

In an effort to better quantify NPP of Creosotebush in the Five-Points region, it was decided to test the Point-Quarter method against the standard 1-m2 quadrat method that has been in use since 1998. Transects were laid out across the 5 mammal trapping webs as well as across burned and unburned plots of the Mixed Shrub site (MS). Repeated measures of the same bushes are performed seasonally. Whole shrubs of various size classes are collected, sorted, and weighed to develop regressions for biomass.

Purpose: Data was collected initially to determine density and dimensions of creosote bush in the Five points area on core rodent webs and on burned and unburned plots following the 2003 prescribed burn. It was decided to expand the project by continuing measurements through time to quantify the change in shrub size and with simultaneous harvest of shrubs to measure NPP.

Publication Date:2024-01-17
For more information:
Visit: DOI PLACE HOLDER

Time Period
Begin:
2007-02-22
End:
2020-09-16

People and Organizations
Contact:Information Manager (Sevilleta LTER) [  email ]
Creator:Moore, Douglas I (University of New Mexico)
Creator:Collins, Scott L (University of New Mexico)
Associate:Tucker, Chandra 
Associate:Baker, Stephanie 
Associate:McClung, Megan 

Data Entities
Data Table Name:
sev201_point_quarter_distance_and_dimension.csv
Description:
SEV LTER point quarter distance and dimension data
Detailed Metadata

Data Entities

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-sev/201/170123/bb19a8daf99c027aba20f55bfb59aa9f
Name:sev201_point_quarter_distance_and_dimension.csv
Description:SEV LTER point quarter distance and dimension data
Number of Records:15844
Number of Columns:15

Table Structure
Object Name:sev201_point_quarter_distance_and_dimension.csv
Size:911185 byte
Authentication:c4e3f98d3be84e987b6cae95dc7e5cf5 Calculated By MD5
Text Format:
Number of Header Lines:1
Record Delimiter:\n
Orientation:column
Simple Delimited:
Field Delimiter:,
Quote Character:"

Table Column Descriptions
 
Column Name:date  
year  
season  
site  
treatment  
web  
rebar  
quadrant  
distance  
tag  
new_tag  
height  
width_1  
width_2  
comments  
Definition:The date on which data or a sample was collected.The year in which data was collected.The season in which data was collectedThe site at which data was collectedThe treatment applied to a site.The number of the web being sampled, which can range from 1-5 depending on site and project.The number of the rebar from which a measurement was taken.The compass direction of the quadrant in which a shrub was measuredThe distance from rebar to the center of a shrub.The number of a shrub as designated by a permanent tag.The number of a shrub as designated by a second tag, affixed after the first.The height from the ground to the tallest point on a shrub.The diameter of a shrub at the widest point.The diameter of a shrub perpendicular to width_1.A special statement related to an observation
Storage Type:date  
date  
string  
string  
string  
string  
string  
string  
float  
string  
string  
float  
float  
float  
string  
Measurement Type:dateTimedateTimenominalnominalnominalnominalnominalnominalrationominalnominalratioratiorationominal
Measurement Values Domain:
FormatYYYY-MM-DD
Precision
FormatYYYY
Precision
Allowed Values and Definitions
Enumerated Domain 
Code Definition
Code1
Definitionwinter
Source
Code Definition
Code2
Definitionsprint
Source
Code Definition
Code3
Definitionfall
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeC
DefinitionCreosote site
Source
Code Definition
CodeCG
DefinitionCreosote grid site
Source
Code Definition
CodeMS
DefinitionMixed shrub site
Source
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeB
Definitionburned
Source
Code Definition
CodeC
Definitioncontrol (unburned)
Source
Definitiontext
Definitiontext
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeNE
DefinitionNortheast quadrant
Source
Code Definition
CodeNW
DefinitionNorthwest quadrant
Source
Code Definition
CodeSE
DefinitionSoutheast quadrant
Source
Code Definition
CodeSW
DefinitionSouthwest quadrant
Source
Unitmeter
Typereal
Min0.01 
Max19.35 
Definitiontext
Definitiontext
Unitcentimeter
Typewhole
Min0 
Max218 
Unitcentimeter
Typewhole
Min0 
Max405 
Unitcentimeter
Typewhole
Min0 
Max422 
Definitiontext
Missing Value Code:
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Expldata missing
CodeNA
Explno comment
Accuracy Report:                              
Accuracy Assessment:                              
Coverage:                              
Methods:                              

Data Package Usage Rights

This data package is released to the "public domain" under Creative Commons CC0 1.0 "No Rights Reserved" (see: https://creativecommons.org/publicdomain/zero/1.0/). It is considered professional etiquette to provide attribution of the original work if this data package is shared in whole or by individual components. A generic citation is provided for this data package on the website https://portal.edirepository.org (herein "website") in the summary metadata page. Communication (and collaboration) with the creators of this data package is recommended to prevent duplicate research or publication. This data package (and its components) is made available "as is" and with no warranty of accuracy or fitness for use. The creators of this data package and the website shall not be liable for any damages resulting from misinterpretation or misuse of the data package or its components. Periodic updates of this data package may be available from the website. Thank you.

Keywords

By Thesaurus:
LTER controlled vocabularynet primary productivity, annual net primary production, seasonality, transects, deserts, grasses, shrubs
LTER core research areaprimary production

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 point-quarter technique is used to quantify the density of the shrubs at both the FivePoints Creosote and the Mixed Shrub (MS) sites. At the rodent webs two, 100 m transects are laid out across the diameter of each web. These transects were laid out using the existing trap locating rebar at 10 m intervals. The rebar used are those on the spoke running from 60 to 50 and then from 122 to 132 rebars at 5 m intervals. The stake at the center of the web is not used. This results in 20 points across each web or 80 shrubs per web. At the mixed shrub site a different arrangement was used. Every other rebar was used along every other line as a measuring point. The rebars were also staggered by 1 rebar from line to line. Ultimately there were 12 rebars used in each plot for a total of 48 shrubs per plot. Shrub Measurements In the initial sampling the shrub nearest the rebar in each quadrant was identified and the distance from the rebar to the rooting point of that shrub was measured. The height of the shrub was measured as well as the diameter of the crown at its widest point and also a diameter perpendicular to this first diameter. Repeated measures of the same bushes are performed seasonally.

QA/QC: Data were scanned by eye to catch mistakes. Data were then filtered in excel to determine if all parameters were met.

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: Douglas I Moore
Organization:University of New Mexico
Email Address:
dimoore@unm.edu
Individual: Scott L Collins
Organization:University of New Mexico
Email Address:
scollins@unm.edu
Contacts:
Organization:Sevilleta LTER
Position:Information Manager
Email Address:
sevim@unm.edu
Associated Parties:
Individual: Chandra Tucker
Role:field crew
Individual: Stephanie Baker
Email Address:
srbaker@unm.edu
Role:field crew
Individual: Megan McClung
Role:field crew

Temporal, Geographic and Taxonomic Coverage

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

Time Period
Begin:
2007-02-22
End:
2020-09-16
Sampling Site: 
Description:Creosote site - C - Located in Five Points is the area which encompasses the Five Points Black Grama and Five Points Creosote Core study sites and falls along the transition between Chihuahuan Desert Scrub and Desert Grassland habitats. Both sites are subject to intensive research activity, including NPP measurement, phenology observation, pollinator diversity studies, and ground dwelling arthropod and rodent population assessments. There are drought rain-out shelters in both the Black Grama and Creosote sites, as well as the mixed-ecotone, with co-located ET Towers.
Site Coordinates:
Longitude (degree): -106.717Latitude (degree): 34.3381
Sampling Site: 
Description:Creosote grid site - CG - Located in Five Points is the area which encompasses the Five Points Black Grama and Five Points Creosote Core study sites and falls along the transition between Chihuahuan Desert Scrub and Desert Grassland habitats. Both sites are subject to intensive research activity, including NPP measurement, phenology observation, pollinator diversity studies, and ground dwelling arthropod and rodent population assessments. There are drought rain-out shelters in both the Black Grama and Creosote sites, as well as the mixed-ecotone, with co-located ET Towers.
Site Coordinates:
Longitude (degree): -106.717Latitude (degree): 34.3381
Sampling Site: 
Description:Mixed Shrub site - MS - The mixed shrub location consists of burned and unburned areas. Both the mixed shrub burned (MSB) and mixed shrub unburned (MSU) areas are on the north side of the road running southeast from Five Points
Site Coordinates:
Longitude (degree): -106.696Latitude (degree): 34.3143

Project

Parent Project Information:

Title:LTER: Sevilleta (SEV) Site: Climate Variability at Dryland Ecotones
Personnel:
Individual: Jennifer A Rudgers
Organization:University of New Mexico
Email Address:
jrudgers@unm.edu
Id:https://orcid.org/0000-0001-7094-4857
Role:Principal Investigator
Funding: National Science Foundation DEB-1655499

Maintenance

Maintenance:
Description:completed
Frequency:

Additional Info

Additional Information:
 

Additional Information on the personnel associated with the Data Collection / Data Processing In January 2011, the Sevilleta NWR experienced an extreme freeze with temperatures reaching below -25 degrees Celcius. These low temperatures negatively impacted the vegetation on the shrubs, resulting in the inablilty to measure the creosote shrubs during that season. Measurements were resumed the following spring of 2011. Sevilleta Field Crew Employee History Chandra Tucker, April 2014-present, Megan McClung, April 2013-present, Stephanie Baker, October 2010-Present, John Mulhouse, August 2009-June 2013, Amaris Swann, August 25, 2008-January 2013, Maya Kapoor, August 9, 2003-January 21, 2005 and April 2010-March 2011, Terri Koontz, February 2000-August 2003 and August 2006-August 2010, Yang Xia, January 31, 2005-April 2009, Karen Wetherill, February 7, 2000-August 2009, Michell Thomey, September 3, 2005-August 2008, Jay McLeod, January 2006-August 2006, Charity Hall, January 31, 2005-January 3, 2006, Tessa Edelen, August 15, 2004-August 15, 2005, Seth Munson, September 9, 2002-June 2004, Caleb Hickman, September 9, 2002-November 15, 2004, Heather Simpson, August 2000-August 2002, Chris Roberts, September 2001-August 2002, Mike Friggens, 1999-September 2001, Shana Penington, February 2000-August 2000.

July 2011- All new data were combined and QA/QC. No shrub measurements were taken in February of 2011 due to the fact that there was a shrub die off caused by extremely low temperatures on the refuge (-20F).--A. Swann February 2009-All new data were combined and QA/QC. On web 4 at the creosote site, shrub 124 was measured twice because it was unknown about if it was one or two bushes and what had been measured in the past. It was identified that sometimes in the past two bushes instead of one was measured. Made note of this to reduce the chance of this happening in the future. At the mixed shrub unburned, shrub 114 and 132 are the same shrub. --A. Swann January 2009 -All data from 2007 and 2008 were combined. Changed the order of variables on datasets to match metadata variable order. Went through the raw data and changed blank distances or ones with -99.00 to -888.00 to denote missing data. Changed missing data on height and weight due to plant being dead to -888. Changed missing data on height and weight due to human error to -999. -Imported excel raw data into Navicat using the wizard. --A. Swann

Other Metadata

Additional Metadata

additionalMetadata
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        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'importedFromXML'
        |     |        \___attribute 'dateImported' = '2024-01-16'
        |     |        \___attribute 'filename' = 'knb-lter-sev.201.271016.xml'
        |     |        \___attribute 'taxonomicCoverageExempt' = 'True'
        |     |___text '\n      '
        |___text '\n   '

Additional Metadata

additionalMetadata
        |___text '\n      '
        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'emlEditor'
        |     |        \___attribute 'app' = 'ezEML'
        |     |        \___attribute 'release' = '2024.01.12'
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