Summary Information
Nitrogen Fertilization Experiment (NFert): Net Primary Production Quadrat Data at the Sevilleta National Wildlife Refuge, New Mexico (2004-present)
Creator:
Individual: Scott Collins
Organization: Collins Lab Webpage
Physical Address:
Delivery Address: Department of Biology, MSC03 2020, 1 University of New Mexico
City: Albuquerque
Locality: NM
Postal Code: 87131
Phone: US
Email: scollins@sevilleta.unm.edu
Metadata Provider:
Individual: Information Manager Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: US
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Associated Party:
Individual: Megan McClung
Organization: Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico, 167 Castetter Hall, MSC03 2020
City: Albuquerque
Locality: NM
Postal Code: 87131
Phone: US
Email: mmcclung@sevilleta.unm.edu
Role: data manager
Associated Party:
Individual: Stephanie Baker
Physical Address:
Delivery Address: Department of Biology
City: Albuquerque
Locality: NM
Postal Code: 87131
Phone: US
Phone: (505) 277-8119
Email: srbaker@sevilleta.unm.edu
Role: field crew
Associated Party:
Individual: Megan McClung
Organization: Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico, 167 Castetter Hall, MSC03 2020
City: Albuquerque
Locality: NM
Postal Code: 87131
Phone: US
Email: mmcclung@sevilleta.unm.edu
Role: field crew
Associated Party:
Individual: Chandra Tucker
Physical Address:
Phone: US
Email: ctucker@sevilleta.unm.edu
Role: field crew
Publication Date: 2016-03-03
Language: English
Abstract:
This dataset is part of a long-term study at the Sevilleta LTER, begun in spring 2004, which examines how fertilization affects above-ground biomass production (ANPP) in a mixed desert-grassland. Net primary production is a fundamental ecological variable that quantifies rates of carbon consumption and fixation. Estimates of NPP are important in understanding energy flow at a community level as well as spatial and temporal responses to a range of ecological processes. Above-ground net primary production is the change in plant biomass, represented by stems, flowers, fruit and foliage, over time and incorporates growth as well as loss to death and decomposition. To measure this change the vegetation variables in this dataset, including species composition and the cover and height of individuals, are sampled twice yearly (spring and fall) at permanent 1m x 1m plots. The data from these plots is used to build regressions correlating biomass and volume via weights of select harvested species obtained in SEV157, "Net Primary Productivity (NPP) Weight Data." This biomass data is included in SEV186, "Nitrogen Fertilization Experiment (NFert): Seasonal Biomass and Seasonal and Annual NPP Data."
Keywords:
Keyword: primary production
Keyword Thesaurus: Core Areas
Keywords:
Keyword: community patterns
Keyword: plant communities
Keyword: plant ecology
Keyword: vegetation dynamics
Keyword: vegetation dynamics
Keyword: plant species composition
Keyword: species richness
Keyword: plant cover
Keyword: net primary productivity
Keyword: annual net primary production
Keyword: plant species composition
Keyword: species richness
Keyword: species richness
Keyword: long term
Keyword: seasonality
Keyword: permanent plots
Keyword: annual net primary production
Keyword: fertilization
Keyword: deserts
Keyword: grasslands
Keyword Thesaurus: LTER Controlled Vocabulary
Additional Information:
Other researchers involved with collecting samples/data: Chandra Tucker (CAT; 04/2014-present), Megan McClung (MAM; 04/2013-present), Stephanie Baker (SRB; 09/2010-present), John Mulhouse (JMM; 08/2010-06/2013), Amaris Swann (ALS; 08/2008-01/2013), Maya Kapoor (MLK; 08/2003 - 01/2005, 05/2010-03/2011), Terri Koontz (TLK; 02/2000-08/2003, 08/2006-08/2010), Yang Xia (YX; 01/2005-03/2010), Karen Wetherill (KRW; 02/2000-08/2009); Michell Thomey (MLT; 09/2005-08/2008); Seth Munson (SMM; 09/2002-06/2004), Jay McLeod (JRM; 01/2006-08/2006); Caleb Hickman (CRH; 09/2002-11/2004), Charity Hall (CLH; 01/2005-01/2006).Data updated 08/18/15: ARPUP6 changed to ARPU9; MOSQ changed to MUSQ3; SPWR changed to SPPO6.
Intellectual Rights:
Data Policies
This dataset is released to the public and may be freely downloaded. Please keep the designated contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement of the Sevilleta LTER. A copy of any publications using these data must be supplied to the Sevilleta LTER Information Manager.
Distribution:
Online:
URL: http://sevdeims-d.lternet.edu/data/sev-155
Coverage:
Geographic Goverage:
Geographic Description: The fertilizer plots are located less than one mile from the Black Butte gate on the east side of the road to Five Points.
Bounding Coordinates:
West Bounding Coordinates: -106.676
East Bounding Coordinates: -106.676
North Bounding Coordinates: 34.4013
South Bounding Coordinates: 34.4013
Bounding Altitude:
Altitude Minimum: 1666
Altitude Maximum: 1666
Altitude Units: meter
Geographic Goverage:
Geographic Description: The fertilizer plots are located less than one mile from the Black Butte gate on the east side of the road to Five Points.
Bounding Coordinates:
West Bounding Coordinates: -106.677
East Bounding Coordinates: -106.677
North Bounding Coordinates: 34.4012
South Bounding Coordinates: 34.4012
Bounding Altitude:
Altitude Minimum: 1666
Altitude Maximum: 1666
Altitude Units: meter
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2004-03-01
End Date:
Calendar Date: 2015-05-12
Maintenance Information:
Description:
1/12/2011 - Quad data for spring and fall 2010 QA/QC'd and put in Navicat. Metadata updated and compiled for 2010. (JM) 11/28/2009 - Quad data QA/QC'd and put in Navicat. Metadata updated and compiled for 2006 -2009. (YX) 1/06/09 - Metadata updated and compiled for 2006, 2007, 2008. (YX) 01/06/09 - As of 2007, winter measurement is no longer being taken. (YX) 12/10/2008 - NPP data from 2004-2008 was QAQC'd in MySQL. I checked for duplicates and missing quads. (YX) 1/12/2006 - Meta data compiled for 2005.  5/16/2005 - Season 3, Plot 11 data didn't distinguish between quads 3 and 4. Original data were checked and this error was corrected. -KLV
Contact:
Position Title: Information Manager
Organization: LTER Network Office
Physical Address:
Delivery Address: UNM Biology Department, MSC03-2020
Delivery Address: 1 University of New Mexico
City: Albuquerque
Locality: NM
Postal Code: 87131-0001
Phone: USA
Phone: 505 277-2535
Phone: 505 277-2541
Email: tech-support@lternet.edu
URL: http://www.lternet.edu
Contact:
Individual: Information Manager Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: US
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Publisher:
Individual: Information Manager Sevilleta LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: US
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Publication Place: Sevilleta LTER
Method Step:
Description:
Study Design: Twenty 10m X 5m plots were established in December 2005. Ten plots are fertilized; ten are unfertilized. Fertilizer is applied twice yearly (spring and fall) as granular NH4NO3 at the rate of 100 kg N ha-1 yr-1.  Within each plot are four sampled quadrats (n=80).  Quadrats are adjacent and numbered from south (1) to north (4) starting at the southeastern corner of each plot. Collecting the Data: Net primary production data is collected twice each year: spring and fall. Spring measurements are taken in April or May when shrubs and spring annuals have reached peak biomass. Fall measurements are taken in either September or October when summer annuals have reached peak biomass but prior to killing frosts. Vegetation data is collected on a palm top computer. A 1-m2 PVC-frame is placed over the fiberglass stakes that mark the diagonal corners of each quadrat. When measuring cover it is important to stay centered over the vegetation in the quadrat to prevent errors caused by angle of view (parallax). Each PVC-frame is divided into 100 squares with nylon string. The dimensions of each square are 10cm x 10cm and represent 1 percent of the total area. The cover (area) and height of each individual live (green) vegetative unit that falls within the one square meter quadrat is measured. A vegetative unit consists of an individual size class (as defined by a unique cover and height) of a particular species within a quadrat. Cover is quantified by counting the number of 10cm x 10cm squares filled by each vegetative unit. It is possible to obtain a total percent cover greater than 100% for a given quadrat because vegetative units for different species often overlap. Niners and plexidecs are additional tools that help accurately determine the cover a vegetative unit. A niner is a small, hand-held PVC frame that can be used to measure canopies. Like the larger PVC frame it is divided into 10cm x 10cm squares, each square representing 1% of the total cover. However, there are only nine squares within the frame, hence the name “niner.†A plexidec can help determine the cover of vegetative units with covers less than 1%. Plexidecs are clear plastic squares that are held above vegetation. Each plexidec represents a cover of 0.5% and has smaller dimensions etched onto the surface that correspond to 0.01%, 0.05%, 0.1%, and 0.25% cover. It is extremely important that cover and height measurements remain consistent over time to ensure that regressions based on this data remain valid. Field crew members should calibrate with each other to ensure that observer bias does not influence data collection Cover Measurements: Grasses-To determine the cover of a grass clump, envision a perimeter around the central mass or densest portion of the plant, excluding individual long leaves, wispy ends, or more open upper regions of the plant. Live foliage is frequently mixed with dead foliage in grass clumps and this must be kept in mind during measurement as our goal is to measure only plant biomass for the current season. In general, recently dead foliage is yellow and dead foliage is gray. Within reason, try to include only yellow or green portions of the plant in cover measurement while excluding portions of the plant that are gray. This is particularly important for measurements made in the winter when there is little or no green foliage present. In winter, sometimes measurements will be based mainly on yellow foliage. Stoloniferous stems of grasses that are not rooted should be ignored. If a stem is rooted it should be recorded as a separate observation from the parent plant. Forbs-The cover of forbs is measured as the perimeter of the densest portion of the plant. If the forb is an annual it is acceptable to include the inflorescence in this measurement. If the forb is a perennial, do not include the inflorescence as part of the cover measurement. Measure all foliage that was produced during the current season, including any recently dead (yellow) foliage. Avoid measuring gray foliage that died in a previous season. Cacti-For cacti that consist of a series of pads or jointed stems (Opuntia phaecantha, Opuntia imbricata) measure the length and width of each pad to the nearest cm instead of cover and height. Cacti that occur as a dense ball/clump of stems (Opuntia leptocaulis) are measured using the same protocol as shrubs. Pincushion or hedgehog cacti (Escobaria vivipara, Schlerocactus intertextus, Echinocereus fendleri) that occur as single (or clustered) cylindrical stems are measured as a single cover. Yuccas-Make separate observations for the leaves and caudex (thick basal stem). Break the observations into sections of leaves that are approximately the same height and record the cover as the perimeter around this group of leaf blades. The caudex is measured as a single cover. The thick leaves of yuccas make it difficult to make a cover measurement by centering yourself over the caudex of the plant. The cover of the caudex may be estimated by holding a niner next to it or using a tape measure to measure to approximate the area. Height Measurements: Height is recorded as a whole number in centimeters. All heights are vertical heights but they are not necessarily perpendicular to the ground if the ground is sloping. Annual grasses and all forbs-Measure the height from the base of the plant to the top of the inflorescence (if present). Otherwise, measure to the top of the green foliage. Perennial grasses-Measure the height from the base of the plant to the top of the live green foliage. Do not include the inflorescence in the height measurement. The presence of live green foliage may be difficult to see in the winter. Check carefully at the base of the plant for the presence of green foliage. If none is found it may be necessary to pull the leaf sheaths off of several plants outside the quadrat. From this you may be able to make some observations about where green foliage is likely to occur. Perennial shrub and sub-shrubs-Measure the height from the base of the green foliage to the top of the green foliage, ignoring all bare stems. Do not measure to the ground unless the foliage reaches the ground. Plants rooted outside but hanging into a quadrat-Do not measure the height from the ground. Measure only the height of the portion of the plant that is within the quadrat. Recording the Data: Excel spreadsheets are used for data entry and file names should begin with the overall study (npp), followed by the date (mm.dd.yy) and the initials of the recorder (.abc). Finally, the site abbreviation should be added (i.e., c, g, b, p). The final format should be as follows: npp_fert.mm.dd.yy.abc.xls. File names should be in lowercase.
Data Table:
Entity Name: sev155_nppfertilizerquadrat_20141215.txt
Entity Description: Fertilizer study npp data.
Object Name: sev155_nppfertilizerquadrat_20150819.txt
Size: 1521118
Data Format:
Text Format:
Number of Header Lines: 1
Record Delimiter: \r\n
Attribute Orientation: column
Simple Delimited:
Field Delimiter: ,
Distribution:
Online:
URL: https://pasta.lternet.edu/package/data/eml/knb-lter-sev/155/233349/bf94a1c50474e2224d8f3c13ff0e529c
Coverage:
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2004-03-08
End Date:
Calendar Date: 2014-09-23
Attribute List:
Attribute Name: year
Attribute Label: year
Attribute Definition: The year in which data was collected.
Storage Type: date
Measurement Scale:
Datetime:
Format String: YYYY
Attribute Name: season
Attribute Label: season
Attribute Definition: The season in which data was collected.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: 1
Definition: winter
Code Definition:
Code: 2
Definition: spring
Code Definition:
Code: 3
Definition: fall
Attribute Name: date
Attribute Label: date
Attribute Definition: The date on which data or a sample was collected.
Storage Type: date
Measurement Scale:
Datetime:
Format String: MM/DD/YY
Missing Value Code:
Code: -999
Code Explanation: missing
Attribute Name: site
Attribute Label: site
Attribute Definition: The site at which data was collected.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: F
Definition: fertilizer site
Attribute Name: treatment
Attribute Label: treatment
Attribute Definition: The experimental regime applied to the project.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: F
Definition: fertilized and burned
Code Definition:
Code: C
Definition: unfertilized and burned
Attribute Name: plot
Attribute Label: plot
Attribute Definition: The plot at which data was collected.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: The plot at which data was collected.
Attribute Name: quad
Attribute Label: quad
Attribute Definition: The quadrat at which data was collected.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: The quadrat at which data was collected.
Attribute Name: species
Attribute Label: species
Attribute Definition: The Kartez code for a plant species as designated by the USDA Plants Database.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: The Kartez code for a plant species as designated by the USDA Plants Database.
Attribute Name: obs
Attribute Label: obs
Attribute Definition: The sequential number given to a specific vegetative unit within a quadrat.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: The sequential number given to a specific vegetative unit within a quadrat.
Attribute Name: cover
Attribute Label: cover
Attribute Definition: The percent cover of an observation (or vegetative unit) for a given species.
Measurement Scale:
Ratio:
Unit:
Custom Unit: percentage
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0.01
Maximum: 100
Missing Value Code:
Code: -999
Code Explanation: missing
Attribute Name: height
Attribute Label: height
Attribute Definition: The height of an observation (or vegetative unit) for a given species. For grasses, this is the average height of green foliage. For herbs, it includes the inflorescence, if applicable.
Measurement Scale:
Ratio:
Unit:
Standard Unit: centimeter
Precision: 1
Numeric Domain:
Number Type: real
Bounds:
Minimum: 0
Attribute Name: count
Attribute Label: count
Attribute Definition: The number of records within a vegetative unit for a given species.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Text Domain:
Definition: The number of records within a vegetative unit for a given species.
Attribute Name: comments
Attribute Label: comments
Attribute Definition: A special statement related to an observation.
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: na
Definition: not applicable