SGS-LTER Ecosystem Stress Area - long-term density dataset following nutrient enrichment stress on the Central Plains Experimental Range in Nunn, Colorado, USA 1975-2011, ARS Study Number 3
This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection.
Water, nitrogen, and water-plus-nitrogen at levels beyond the range normally experience by shortgrass steppe communities were applied from 1971 through 1975, plant densities were sampled through 1977, and then sampling resumed in 1982, with sampling frequencies changing from annually to every other year. The initial sampling from 1970 to 1974 showed that the water and water plus nitrogen treatments had the strongest effect on plant community structure, both treatments increased biomass, and exotic weed species were noted on the water plus nitrogen treatment. Later sampling from 1982 to 1991 showed a ten-fold increase in exotic weed species on the water plus nitrogen plots as compared to the controls (Milchunas and Lauenroth 1995), a community change that has persisted on this site due to a chronic elevation of soil nitrogen caused by a plant tissue/soil organic matter feedback mechanism (Vinton and Burke 1995). In 1998, Six new treatments were superimposed on the historic study site. The six new treatments were: control, sugar, lignin, sawdust, lignin and sugar, and sawdust and sugar.In 2010, plots will be sampled every 5 years. Our objective in this study is to examine how plant communities change through time and explore implications of these changes for monitoring potentially stressed ecosystems. Additional information and referenced materials can be found: http://hdl.handle.net/10217/83317.
Simple
- Date ( Publication )
- 2013
- Identifier
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knb-lter-sgs.520.8
- Date
- Identifier
- ESA_density
- FIPS State/County Codes ( Place )
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- Colorado=08 > Weld County=08123
- GCMD Locations ( Place )
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- CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > COLORADO
- Keywords
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- NP215
- Data Source Affiliation ( Theme )
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- United States Department of Agriculture > Agricultural Research Service > Long-Term Agroecosystem Research > Central Plains Experimental Range
- NSF > LTER=Long-Term Ecological Research
- USDA > ARS > Natural Resources and Sustainable Agricultural Systems National Program > 215 Pasture, Forage and Rangeland Systems
- Hydrologic Unit Codes (HUC) ( Theme )
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- 101900080301
- NRCS Major Land Resource Areas ( Theme )
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- Western Great Plains Range and Irrigated Region=G > Central High Plains, Southern Part=67B
- Ag Data Commons Keywords ( Theme )
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- Agroecosystems & Environment
- Ag Data Commons Project Name ( Theme )
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- Long-Term Agroecosystem Research - LTAR
- Central Plains Experimental Range
- Ag Data Commons Data License Type ( Theme )
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- Creative Commons Attribution
- Federal Program Inventory ( Theme )
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- Department of Agriculture=5 > National Research=005:040
- OMB Bureau Codes ( Theme )
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- Department of Agriculture=5 > Agricultural Research Service=005:018
- Crossref Funding ( Theme )
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- Agricultural Research Service
- National Science Foundation
- Keywords
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- inorganic nutrients
- populations
- biodiversity
- disturbance
- community ecology
- community dynamicss
- density
- water
- fertilization
- Access constraints
- Other restrictions
- Other constraints
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URL for Access Policies
http://www.lternet.edu/policies/data-access
Data Access Policy
Data sets were provided by the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Program, a partnership between Colorado State University, United States Department of Agriculture, Agricultural Research Service, and the U.S. Forest Service Pawnee National Grassland. Significant funding for these data was provided by the National Science Foundation Long Term Ecological Research program (NSF Grant Number DEB-1027319). The SGS-LTER project (1980-2014) was established as one of the first sites in the US LTER Network and has produce a rich legacy of digital materials including reports, proposals, images, and data packages. Data, products and other information produced from the SGS-LTER are curated as a collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429. Materials can be accessed from the Institutional Digital Repository of Colorado State University or upon request by emailing ecodata_nrel@colostate.edu. All data are open for dissemination and re-use for any purpose, but you must attribute credit to the owner and cite use appropriately according to the LTER Data Access Policy.
- Metadata language
- en
- Topic category
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- Environment
- Farming
- Biota
))
- Distribution format
-
- OnLine resource
- https://pasta.lternet.edu/package/data/eml/knb-lter-sgs/520/8/d9ab9079a2a6aecfb65b393c5383fd91 ( https )
- Hierarchy level
- Dataset
- Description
- Methods for this dataset: Blocks – There are 2 blocks, one to the east and one to the west. Data need to be collected in a total of 9 areas. 2 reps repeat the same treatment (D1 control, D2 control, E1 irrigation, E2 irrigation, F1 fertilization, F2 fertilization, G1 irrigation and fertilization, G2 irrigation and fertilization). In addition, there is a part of D2 that contains the grub kill. The area that contains the grub kill should be recorded as D2-G on all data sheets. The grub kill plots are marked with tent stakes rather than rebar and need to be identified with unique flagging. Transects 1-5 – see transect lines below. The transects in the grub kill area of D2 is recorded as “G”. Plot numbers range from 1-50 in the grub kill area of D2 only. Control transects in the D2 grub kill area so no follow the standard design below. Please follow the attached map for the D2 and grub kill plots. Plots 1-10 – see plots below. Permanent plots were established by installing transects of rebar. Each rebar has a blaze orange plastic cap. The transect and plots number need to be re-written on each cap with sharpie prior to sampling. Density Sampling Procotol: A 0.25 m2 circular quadrat with four quarter plots is placed with the cross bars in the northeast corner. Collect data starting in the northeast quarter plot (1) and work your way around clockwise to #4. Count all of the individuals of each species rooted within each quarter plot and record the data under the appropriate quarter plot number. Use the species column to record the correct species code. If a species is not found in a quarter plot, then enter a “0” in that cell on the data sheet. We do not count the number of individuals of Bogr or Buda. Point-Frame Sampling Protocol for Basal Cover: Use the ten point frame to estimate cover at each plot location. The point frame should be placed at a random angle around the rebar. This will provide a total of 10 points of contact for each plot. The categories to record are plant species code, litter (code = litt), bare ground (code = bare), and lichen (code = pach). Be very critical about what the contact really is. If the tip intercepts dead crown, record it as litter. If the tip intercepts live crown of a plant, record the species code. The accuracy of the method is determined by how carefully contacts are identified. Record only what the exact tip of the point touches at the soil surface. Ignore hits on leaves as point move through the frame to touch what occurs at the basal level.
- File identifier
- knb-lter-sgs.520.8 XML
- Metadata language
- eng
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2019-08-27T16:59:15
- Metadata standard name
- ISO 19115
- Metadata standard version
- 2003
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