SGS-LTER Effects of water and nitrogen additions on aboveground biomass in shortgrass ecosystems on the Central Plains Experimental Range, Nunn, Colorado, USA 1997-2011, ARS Study Number 143
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.
The objective of this research is to evaluate the long-term response of shortgrass ecosystems to additional water and nitrogen inputs. An experiment was conducted during the IBP project (1970-1975) in which water and nitrogen were applied (Lauenroth et al. 1978, Dodd and Lauenroth 1979, Milchunas and Lauenroth 1995). While we gained an enormous increment in our knowledge about shortgrass ecosystems from this experiment it raised as many questions as it answered. One of the problems was that the treatments were very high levels of nitrogen (100-150kg/ha N) and water (600 mm/growing season) additions. Additional information and referenced materials can be found: http://hdl.handle.net/10217/85629.
Simple
- Date ( Publication )
- 2014
- Identifier
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knb-lter-sgs.542.1
- Date
- Identifier
- X-site_AG_Biomass
- 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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- primary production
- biomass
- fertilization
- irrigation
- disturbance
- 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
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- OnLine resource
- https://pasta.lternet.edu/package/data/eml/knb-lter-sgs/542/1/9882e2b493b149b77341c992984b383e ( https )
- Hierarchy level
- Dataset
- Description
- Methods for this dataset: We will use a factorial combination of water and nitrogen additions. Our current plan is to have nitrogen additions in the range of 50 kg/ha N and water additions of about 350 mm/growing season. These represent our best estimates of conditions at thte eastern extreme of the area in the Great Plains dominated by Bouteloua gracilis and Buchloe dactyloides. Our principal interest will be to assess effects on soil processes (nitrogen and carbon balance), plant population dynamics, plant community dynamics, and net primary production. The major disturbance to the plots besides the treatments will be the removal of soil cores. The maximum intensity of sampling would be 80 cores per treatement per year. This would only happen in a few years. Density and Basal Cover Protocol: Fifty random coordinates (x,y) between 0 and 30 meters are provided on a check-off sheet (see following pages). Lay out the measuring tapes along the x and y axis and pace off to each random coordinate and place a flag there, with the coordinates written on it. Place pins flags for all fifty random quadrats. The same set of fifty coordinates may be used for all treatment areas. Place the Daubenmire .10 m2 frame over the flag, with the legs up, if any. Go around the edge and determine what is rooted inside and out of the quadrat. The plants being measured must be rooted inside, regardless of the canopy cover. Estimate the Basal vegetation cover using Daubenmire cover classes and count the number of individuals of each species are counted. Unkowns shoud be labeled as forb, grass or shrub with the codes UNFB, UNGR, or UNSH. If an unknown is encountered several times it should be given a number or name, and identified at a later date, and the data sheets recoded with the correct four-letter species code. For basal cover, the code for bare ground is BARE, litter is LITT, and lichen is LICH. Scat, including rabbit, pronghorn, and cow should be considered as part of the litter cover. Record the Daubenmire code for the appropriate cover class. Please double-check that your percent basal cover does not exceed 100%. Of course, you will need to take into consideration whether a species is at the low end or the high end of the cover class. Density of BOGR, BUDA, BARE, and LITT are not recorded (they are estimated in the basal cover reading.) Density if OPPO is counted as the number of live cladodes (pads). Density of bunchgrass species, such as SIHY, ARLO, SPCR, and STCO is the number of clumps, and for grasses such as AGSM, it’s the number of tillers. Density of forbs and shrubs is the number of stems separately emerging from the surface of the ground. REMEMBER look for CAHE. We identify only one Astragalus/Oxytropus to species—the vine like one is ASGR (with thinner leaves and small purple flowers). All others are lumped under the code ASOX. The two Orabanche species are coded OROB. Clipping Protocol for Aboveground Biomass: Ten random plots are clipped from within each block. Random numbers between 1 and 25 should be generated to establish plot coordinates x and y. Clip at crown-level, except for shrubs. Only current year growth of shrubs are clipped that is green and has leaves, and which grows from an older, woodier branch. All live and recent dead material needs to be harvested from the plot – check your plot before moving to the next one. You can brush the old-dead material away from the clipped material with your fingers. Collect old dead and litter separately combined for all species and put it in a sample bag together (the gray colored material). Plots are clipped by ARS Functional Groups. It is usually easier to first clip species other than BOGR and BUDA. There are three cactus species on the site. Only current year growth of OPPO is clipped – these are the small pads. The two “barrel” cactus are not clipped (ECVI and COVI). There are only some times when combining of species may be done. You must follow these rules when combining species.
- File identifier
- knb-lter-sgs.542.1 XML
- Metadata language
- eng
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2019-08-27T16:58:53
- Metadata standard name
- ISO 19115
- Metadata standard version
- 2003
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