Summary Information
Effects of Multiple Resource Additions on Community and Ecosystem Processes: NutNet Seasonal Biomass and Seasonal and Annual NPP Data at the Sevilleta National Wildlife Refuge, New Mexico
Creator:
Individual: Scott Collins
Organization: SEV LTER
Physical Address:
Delivery Address: Department of Biology, MSC03 2020, 1 University of New Mexico
City: Albuquerque
Locality: NM
Postal Code: 87131
Email: scollins@sevilleta.unm.edu
System ID: 12275
Publication Date: 2015
Language: english
Abstract:
Two of the most pervasive human impacts on ecosystems are alteration of global nutrient budgets and changes in the abundance and identity of consumers. Fossil fuel combustion and agricultural fertilization have doubled and quintupled, respectively, global pools of nitrogen and phosphorus relative to pre-industrial levels. In spite of the global impacts of these human activities, there have been no globally coordinated experiments to quantify the general impacts on ecological systems. This experiment seeks to determine how nutrient availability controls plant biomass, diversity, and species composition in a desert grassland. This has important implications for understanding how future atmospheric deposition of nutrients (N, S, Ca, K) might affect community and ecosystem-level responses. This study is part of a larger coordinated research network that includes more than 40 grassland sites around the world. By using a standardized experimental setup that is consistent across all study sites, we are addressing the questions of whether diversity and productivity are co-limited by multiple nutrients and if so, whether these trends are predictable on a global scale.Above-ground net primary production is the change in plant biomass, represented by stems, flowers, fruit and and foliage, over time and incoporates growth as well as loss to death and decomposition. To measure this change the vegetation variables, including species composition and the cover and height of individuals, are sampled twice yearly (spring and fall) at permanent 1m x 1m plots within each site. Volumetric measurements are made using vegetation data from permanent plots (SEV231, "Effects of Multiple Resource Additions on Community and Ecosystem Processes: NutNet NPP Quadrat Sampling") and regressions correlating species biomass and volume constructed using seasonal harvest weights from SEV157, "Net Primary Productivity (NPP) Weight Data."
Keywords:
Keyword: inorganic nutrients
Keyword: populations
Keyword: primary production
Keyword Thesaurus: Core Areas
Keywords:
Keyword: communities
Keyword: plant communities
Keyword: species
Keyword: plant species
Keyword: species lists
Keyword: plant species composition
Keyword: species diversity
Keyword: productivity
Keyword: net primary productivity
Keyword: annual net primary production
Keyword: biomass
Keyword: plant biomass
Keyword: aboveground biomass
Keyword: species composition
Keyword: seasonality
Keyword: primary production
Keyword: net primary production
Keyword: species interactions
Keyword: nutrients
Keyword: ecosystems
Keyword: terrestrial ecosystems
Keyword: grasslands
Keyword: vegetation
Keyword Thesaurus: LTER Controlled Vocabulary
Additional Information:
Additional Information on the Data Collection PeriodSpecies composition and net primary production was sampled semiannually (spring and fall) in 2007, 2008, and 2009. Soil was sampled and analyzed in the fall in 2007 and 2008. Plots were fertilized annually starting in 2008.In August 2009, a wildfire burned all 40 of the NutNet plots causing no Fall 2009 vegetation measurements.Special Codes for Vegetation Ids:SPORSP- Unknown SporobolusSPSP- Unknown SphaeralceaUNKFO- Unknown Forb
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. Datasets must be cited as in the example below. Muldavin, E. 2004. Sevilleta LTER Fertilizer NPP Study Dataset. Albuquerque, NM: Sevilleta Long Term Ecological Research Site Database: SEV155. (Date of download) A copy of any publications using these data must be supplied to the Sevilleta LTER Information Manager.
Distribution:
Online:
URL: http://sev.lternet.edu/node/7277
Coverage:
Geographic Goverage:
Geographic Description: Location: Deep Well is located on McKenzie Flats and is site of the longest running SEV LTER met station, number 40, which has been active since 1988.  In addition to studies of meteorological variables, core line-intercept vegetation transects and line-intercept transects from the 1995 and 2001 Deep Well fires are sampled here.  The mini-rhizotron study, blue and black grama compositional comparison, blue and black grama patch dynamics investigation, and kangaroo rat population assessement are all ongoing here.  Deep Well Blue/Black Grama Mixed is also the location of the warming and monsoon experiments, as well as portions of the line-intercept and vegetation removal studies. On August 4, 2009, a lightning-initiated fire began on the Sevilleta National Wildlife Refuge. By August 5, 2009, the fire had reached the area of Deep Well Blue/Black Grama Mixed.  While portions of this site were burned, the entirety was not.  See individual projects for further information on the effects of the fire.Vegetation: The vegetation of Deep Well Blue/Black Grama Mixed is Chihuahuan Desert Grassland, dominated by black grama (Bouteloua eriopoda) and blue grama (B. gracilis). Other grasses found at the site include dropseeds (Sporobolus spp.) and threeawns (Aristida spp.). Shrubs are uncommon but those that occur include Yucca glauca, Ephedra torreyi, and four-wing saltbush (Atriplex canescens). Herbaceous plants include Plantago purshii, Hymenopappus filifolius, and globe mallows (Sphaeralcea spp.). ,
Bounding Coordinates:
West Bounding Coordinates: -106.7358
East Bounding Coordinates: -106.7358
North Bounding Coordinates: 34.3592
South Bounding Coordinates: 34.3592
Bounding Altitude:
Altitude Minimum: 1600
Altitude Maximum: 1600
Altitude Units: meter
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2008-05-13
End Date:
Calendar Date: 2012-01-10
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
Organization: SEV LTER
Physical Address:
Delivery Address: 1 University of New Mexico
City: Albuquerque
Postal Code: 87131
Phone: (505) 277-2109
Phone: (505) 277.5355
Email: data-use@sevilleta.unm.edu
Publication Place: Sevilleta LTER
Method Step:
Description:
Data Processing Techniques to Derive Biomass and NPP:Data from SEV231 and SEV157 are used used to calculate seasonal and annual production of each species in each quadrat for a given year. Allometric equations derived from harvested samples of each species for each season are applied to the measured cover, height, and count of each species in each quadrat. This provides seasonal biomass for winter, spring, and fall.Seasonal NPP is derived by subtracting the previous season's biomass from the biomass for the current season. For example, spring NPP is calculated by subtracting the winter weight from the spring weight for each species in a given quadrat. Negative differences are considered to be 0. Likewise, fall production is computed by subtracting spring biomass from fall biomass. Annual biomass is taken as the sum of spring and fall NPP.
Data Table:
Entity Name: sev293_nutnetbiomass_20150325.txt
Entity Description: Data for Sev293.
Object Name: sev293_nutnetbiomass_20150325.txt
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/293/155436/8c07ca715ea62f9e554c38a71a633578
Coverage:
Temporal Coverage:
Date Range:
Begin Date:
Calendar Date: 2008-01-01
End Date:
Calendar Date: 2014-12-12
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: 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: N
Definition: Nutritent Network site, located within Deep Well blue/black grama mixed grassland.
Attribute Name: treatment
Attribute Label: treatment
Attribute Definition: The fertilizer regime applied to a quadrat for the Nutrient Network project (SEV231).
Storage Type: string
Measurement Scale:
Nominal:
Non Numeric Domain:
Enumerated Domain:
Code Definition:
Code: NPK
Definition: Nitrogen, phosphorus, and potassium added.
Code Definition:
Code: NP
Definition: Nitrogen and phosphorus added.
Code Definition:
Code: NK
Definition: Nitrogen and potassium added.
Code Definition:
Code: N
Definition: Nitrogen added.
Code Definition:
Code: PK
Definition: Phosphorus and potassium added.
Code Definition:
Code: P
Definition: Phosphorus added.
Code Definition:
Code: K
Definition: Potassium added.
Code Definition:
Code: C
Definition: Control/no fertilizer.
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: wwt
Attribute Label: wwt
Attribute Definition: The calculated weight of live green biomass for a species in a quadrat in the winter.
Measurement Scale:
Ratio:
Unit:
Standard Unit: gramsPerSquareMeter
Precision: 0.01
Numeric Domain:
Number Type: real
Attribute Name: swt
Attribute Label: swt
Attribute Definition: The calculated weight of live green biomass for a species in a quadrat in the spring.
Measurement Scale:
Ratio:
Unit:
Standard Unit: gramsPerSquareMeter
Precision: 0.01
Numeric Domain:
Number Type: real
Attribute Name: fwt
Attribute Label: fwt
Attribute Definition: The calculated weight of live green biomass for a species in a quadrat in the fall.
Measurement Scale:
Ratio:
Unit:
Standard Unit: gramsPerSquareMeter
Precision: 0.01
Numeric Domain:
Number Type: real
Attribute Name: snpp
Attribute Label: snpp
Attribute Definition: The calculated primary production of a species in a quadrat in the spring.
Measurement Scale:
Ratio:
Unit:
Standard Unit: gramsPerSquareMeter
Precision: 0.01
Numeric Domain:
Number Type: real
Attribute Name: fnpp
Attribute Label: fnpp
Attribute Definition: The calculated primary production of a species in a quadrat in the fall.
Measurement Scale:
Ratio:
Unit:
Standard Unit: gramsPerSquareMeter
Precision: 0.01
Numeric Domain:
Number Type: real
Attribute Name: anpp
Attribute Label: anpp
Attribute Definition: The calculated annual primary production of a species in a quadrat.
Measurement Scale:
Ratio:
Unit:
Standard Unit: gramsPerSquareMeter
Precision: 0.01
Numeric Domain:
Number Type: real