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Open/Close section Identification Information
Title: EnviroAtlas - Cultivated biological nitrogen fixation in agricultural lands by 12-digit HUC in the Conterminous United States, 2006
Abstract: This EnviroAtlas dataset contains data on the mean cultivated biological nitrogen fixation (C-BNF) in cultivated crop and hay/pasture lands per 12-digit Hydrologic Unit (HUC) in 2006. Nitrogen (N) inputs from the cultivation of legumes, which possess a symbiotic relationship with N-fixing bacteria, were calculated with a recently developed model relating county-level yields of various leguminous crops with BNF rates. We accessed county-level data on annual crop yields for soybeans (Glycine max L.), alfalfa (Medicago sativa L.), peanuts (Arachis hypogaea L.), various dry beans (Phaseolus, Cicer, and Lens spp.), and dry peas (Pisum spp.) for 2006 from the USDA Census of Agriculture (http://www.agcensus.usda.gov/index.php). We estimated the yield of the non-alfalfa leguminous component of hay as 32% of the yield of total non-alfalfa hay (http://www.agcensus.usda.gov/index.php). Annual rates of C-BNF by crop type were calculated using a model that relates yield to C-BNF. We assume yield data reflect differences in soil properties, water availability, temperature, and other local and regional factors that can influence root nodulation and rate of N fixation. We distributed county-specific, C-BNF rates to cultivated crop and hay/pasture lands delineated in the 2006 National Land Cover Database (30 x 30 m pixels) within the corresponding county. C-BNF data described here represent an average input to a typical agricultural land type within a county, i.e., they are not specific to individual crop types. This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).
Purpose: The purpose of this dataset is to provide information that can be used to estimate landscape-level loading of reactive nitrogen from cultivated biological nitrogen fixation (C-BNF) to watersheds, to municipal, agricultural, and water resources management units, and to other management- or ecosystem-relevant spatial units. C-BNF is a major source of reactive N to United States ecosystems and can have both positive (e.g., enhanced crop production and reduced reliance on fossil-fuel based synthetic fertilizers) and negative (e.g., eutrophication of aquatic systems indirectly through manure disposal) impacts. These data can be used to examine correlations with air and water quality characteristics or be fed into terrestrial and aquatic biogeochemical models. The overall goal of EnviroAtlas is to employ and develop the best available science to map indicators of ecosystem services production, demand, and drivers for the nation.
Open/Close section Distribution Information
Resource(Server) URL: https://enviroatlas.epa.gov/arcgis/rest/services/National/National2016_master/MapServer
Download URL: https://edg.epa.gov/data/PUBLIC/ORD/ENVIROATLAS/National
Reference URL: https://www.epa.gov/enviroatlas/enviroatlas-data
Website URL: https://www.epa.gov/enviroatlas
Open/Close section Time Period of Content
Publication Date: 20150507
Progress: Completed
Frequency: As needed
Open/Close section Single Date
Date: 20130920
Currentness: Publication date
Open/Close section Spatial Domain
West Bounding Longitude: -128.02839229
East Bounding Longitude: -65.20336449
North Bounding Latitude: 51.6773602
South Bounding Latitude: 22.7348894
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Open/Close section Constraints
License https://edg.epa.gov/EPA_Data_License.html
Access: None
Use: None. Please check sources, scale, accuracy, currency and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.
Open/Close section Theme Keywords
Theme Topics: Environment and Conservation, Agriculture and Farming
Open/Close section Contact Information
Originator: US Environmental Protection Agency (US EPA)
Email: EnviroAtlas@epa.gov
Address Type: mailing and physical address
City: Research Triangle Park
State: NC
Postal Code: 27709
Telephone: (919) 541-3832
Open/Close section Metadata Reference Information
File Identifier: {18DA5C01-F53D-4CC3-B557-046C3FF5A584}
Metadata Date Stamp: 2017-05-22
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
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