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Surface abrasion and crust evolution following vegetation removal at the Jornada Basin LTER Scrape Site, 1995 to 2019

General Information
Data Package:
Local Identifier:knb-lter-jrn.210122001.102
Title:Surface abrasion and crust evolution following vegetation removal at the Jornada Basin LTER Scrape Site, 1995 to 2019
Alternate Identifier:DOI PLACE HOLDER
Abstract:

This data package contains measurements of soil surface abrasion and the evolution of soil crust shear strength following a soil and vegetation removal (scrape) treatment at the Jornada Basin LTER site in southern New Mexico, USA. Soil erosion and soil crust shear strength is measured at 3 locations along the prevailing wind direction across a site initially scraped in 1995 to remove the A soil horizon in a 100 meter radius semicircle. There are three monitoring stations (East, Middle, West) on the Scrape Site. The West site is the windward site, the East site is the leeward site, and the middle site is halfway between the other two. At each location, measurements are taken of the distance of the sand surface and soil crust to a crossbar set into the soil. Three "Torvane" measurements that measure the torque (shear strength) needed to break the crust are also made at each location. These measurements were made monthly until 2014, and are made annually since 2015. The Scrape Site has now become the location for the GROWES study (JRN study IDs 511 and 523). Data collection for this study is ongoing.

Publication Date:2019-12-10

Time Period
Begin:
1995-01-02
End:
2019-01-07

People and Organizations
Contact:Data Manager [  email ]
Contact:Anderson, John (Jornada Basin LTER) 
Creator:Gillette, Dale (Jornada Basin LTER)
Creator:Okin, Greg (University of California Los Angeles)

Data Entities
Data Table Name:
Soil surface height and shear strength measurements
Description:
Soil surface height and shear strength measurements
Detailed Metadata

Data Entities

Data Table

Data:https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210122001/102/c834e79a02f6097ee0cf0b45e7a45bc7
Name:Soil surface height and shear strength measurements
Description:Soil surface height and shear strength measurements
Number of Records:732
Number of Columns:10

Table Structure
Object Name:JRN_122001_crust_evolution_scrape.csv
Size:31933 bytes
Authentication:83fa610d029164448f2012dbc4cbb47f Calculated By MD5
Text Format:
Number of Header Lines:1
Record Delimiter:\n
Orientation:column
Simple Delimited:
Field Delimiter:,

Table Column Descriptions
 
Column Name:year  
month  
date  
tower  
sand_ht  
crust_ht  
torvane1  
torvane2  
torvane3  
comment  
Definition:Year of measurementMonth of measurementDate of measurementTower location [East, middle, or west[Sand height to crossbarCrust height to crossbarRep 1 of torque needed to break soil crustRep 2 of torque needed to break soil crustRep 3 of torque needed to break soil crustComments
Storage Type:date  
date  
date  
string  
float  
float  
float  
float  
float  
string  
Measurement Type:dateTimedateTimedateTimenominalratioratioratioratiorationominal
Measurement Values Domain:
FormatYYYY
Precision
FormatMM
Precision
FormatYYYY-MM-DD
Precision
Allowed Values and Definitions
Enumerated Domain 
Code Definition
CodeEast
DefinitionEast tower location
Source
Code Definition
CodeMiddle
DefinitionMiddle tower location
Source
Code Definition
CodeWest
DefinitionWest tower location
Source
Unitcentimeter
Typereal
Min1.7 
Max29.8 
Unitcentimeter
Typereal
Min1.8 
Max30 
UnitkilogramsPerSquareCentimeter
Typereal
Min1 
Max9 
UnitkilogramsPerSquareCentimeter
Typereal
Min1 
Max8.5 
UnitkilogramsPerSquareCentimeter
Typereal
Min1 
Max8.5 
DefinitionComments
Missing Value Code:        
CodeNA
ExplMissing data
CodeNA
ExplMissing data
CodeNA
ExplMissing data
CodeNA
ExplMissing data
CodeNA
ExplMissing data
  
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 AreaDisturbance
JRN Dataset KeywordsAeolian (Wind Related), long-term, LTER III, Land-Atmosphere Interactions
Jornada Project NamesScrape Site, GROWES
Jornada Place NamesScrape Site, GROWES
LTER Controlled Vocabularyerosion, wind , soil, soil disturbance, soil horizons, land surface properties, land cover, disturbance, defoliation
(No thesaurus)abrasion, crust, cutting, shear strength, torque, torvane, scrape

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:

Study design and measurements

The "Scrape Site" was first cleared of vegetation and the A and B Horizon in 1995 by Brad Musick according to his specifications. Kris Havstad of USDA Jornada Experimental Range may know more details. What is left is a nice crust that is uniformly abrading down. The scraping occurred on a 100 meter radius semi-circle. There are three monitoring stations (East, Middle, West) in the semi-circle of the Scrape Site. The West site is the windward site, the East site is the leeward site, and the middle site is halfway between the other two.

At each of the 3 monitoring locations, the distance of the crust surface to a crossbar set into the soil is measured. This distance is measured with a metric rule from the top of a coin (always a U.S. quarter) resting on the soil surface to the flattened section on the bottom of the crossbar. Since the purpose is to measure change in surface height, it is not necessary to make the height measurement from the soil surface itself.

Three "torvane" measurements that measure the torque needed to break the crust are also recorded at each monitoring location. Torvane measurements were made on the first work day of the month until annual measurements began in 2015; they are now done in December. Measurements are made at each station (East, Middle, West) at three locations chosen randomly within approximately 5 feet around the erosion bridge (band) where the crust is visible.

Torvane protocol

There are three sets of vanes supplied with the Torvane unit; the larger of them is used (ratio of 0.2) and fitted to the vane driver. Set the zero on the inner dial to align with index mark on knob. A counter-clockwise rotation of the dial face (while holding onto the vane) brings the zero mark on the dail face back to the index mark. The Torvane is gently pushed into the soil to the depth of the blades. Slowly rotate the knob clockwise while maintaining constant vertical pressure until the crust fails. Use a rate of rotation such that failure develops in 5 to 10 seconds. After failure occurs, release the remaining spring tension slowly and the index mark on the knob will indicate the maximum shear value. Record this number to the nearest 0.5 kg/cm2; e.g., 4.0, 6.5. Repeat this for each of the three measurements at each of the three sites. On occasion an additional measurement is necessary to replace one where the unit is inadvertently moved while making one of the previous measurements.

People and Organizations

Creators:
Individual: Dale Gillette
Organization:Jornada Basin LTER
Individual: Greg Okin
Organization:University of California Los Angeles
Id:https://orcid.org/0000-0002-0484-3537
Contacts:
Individual: Data Manager
Email Address:
datamanager.jrn.lter@gmail.com
Individual: John Anderson
Organization:Jornada Basin LTER
Id:https://orcid.org/0000-0002-6417-8022

Temporal, Geographic and Taxonomic Coverage

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

Time Period
Begin:
1995-01-02
End:
2019-01-07
Geographic Region:
Description:The Scrape Site/GROWES is at the North end of JER Pasture 11A, in the Basin Floor geomorphic unit.
Bounding Coordinates:
Northern:  32.7494871Southern:  32.47317259
Western:  -106.8728831Eastern:  -106.6927163

Project

Parent Project Information:

Title:Jornada Basin LTER III
Personnel:
Individual: Greg Okin
Organization:University of California Los Angeles
Id:https://orcid.org/0000-0002-0484-3537
Role:Principal Investigator
Funding: NSF

Maintenance

Maintenance:
Description:Monthly measurements to 2015, annual measurements therafter. Study is ongoing.
Frequency:
Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'id' = 'kilogramsPerSquareCentimeter'
        |     |     |     |  \___attribute 'multiplierToSI' = '0.0001'
        |     |     |     |  \___attribute 'name' = 'kilogramsPerSquareCentimeter'
        |     |     |     |  \___attribute 'parentSI' = 'kilogramsPerSquareMeter'
        |     |     |     |  \___attribute 'unitType' = 'arealMassDensity'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'kilograms per square cm'
        |     |     |     |___text '\n        '
        |     |     |___text '\n      '
        |     |___text '\n    '
        |___text '\n  '

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