EnviroAtlas - Cultivated biological nitrogen fixation in agricultural lands by 12-digit HUC in the Conterminous United States,
2006
Dataset Identification:
Resource 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. 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).
Citation
Title EnviroAtlas - Cultivated biological nitrogen fixation in agricultural lands by 12-digit HUC in the Conterminous United States,
2006
publication Date
2013-09-20
cited responsible party
-
publisher
organisation Name
U.S. EPA Office of Research & Development (ORD) - National Exposure Research Laboratory (NERL)
Contact information
Address
, Research Triangle Park, NC
cited responsible party
-
originator
organisation Name
US Environmental Protection Agency (US EPA)
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.
Resource language:
eng; USA
Resource progress code:
completed
Resource Maintenance Information
maintenance or update frequency:
asNeeded
Constraints on resource usage:
Constraints
Use limitation statement:
https://edg.epa.gov/EPA_Data_License.htm
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other constraints
Use Constraints: None. Please check sources, scale, accuracy, currentness 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.
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Access Constraints: None.
Constraints on resource usage:
Security Constraints
Classification
PUBLIC
Classification
System FIPS Pub 199
Handling
Description Standard Technical Controls
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude
-128.02839229
eastBoundLongitude
-65.20336449
northBoundLatitude
51.6773602
southBoundLatitude
22.7348894
Temporal Extent
2013-09-20
point of contact
-
pointOfContact
individual Name EnviroAtlas Coordinator
organisation Name
US Environmental Protection Agency, Research Triangle Park
position Name ORD/NERL/EnviroAtlas
Contact information
Telephone
Voice 000-000-0000
Address
109 TW Alexander Dr., Research Triangle Park, NC, 27711
descriptor Mean rate of cultivated biological nitrogen fixation in kg N/ha/yr per 12-digit HUC for 2006
sequence Identifier
name MEAN
Long Wavelength
84.43632
Short Wavelength
0
units
Band
descriptor Twelve Digit Hydrologic Unit Code. This field provides a unique 12-digit code for each subwatershed. Numbers were assigned
in an upstream to downstream fashion. Where no downstream/upstream relationship could be determined, numbers were assigned
in a clockwise fashion.
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description
Data were collected using methods that have unknown accuracy (EPA National Geospatial Data Policy [NGDP] Accuracy Tier 10).
For more information, please see EPA's NGDP at https://www.epa.gov/geospatial/geospatial-policies-and-standards
Completeness Commission
evaluation Method Description
Features represented have not been tested for completeness
Completeness Omission
evaluation Method Description
Features represented have not been tested for completeness
ConceptualConsistency
measure Description
Tests for integrity have not been performed.
notes: This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version
FGDC-STD-001-1998) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
Metadata contact
-
pointOfContact
individual Name EnviroAtlas Coordinator
organisation Name
US Environmental Protection Agency, Research Triangle Park
position Name ORD/NERL/EnviroAtlas
Contact information
Telephone
Voice 000-000-0000
Address
109 TW Alexander Dr., Research Triangle Park, NC, 27711