{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Carla R. Reis Ely", "hasEmail": "mailto:carlargreis@gmail.com"}, "description": "This dataset includes field measurements of biological nitrogen fixation (BNF) in all major N-fixing niches across natural terrestrial biomes globally. The dataset comprises 32 variables including site location, biome type, N-fixing niche, sampling year, quantification method, BNF rate (in kgN/(ha*y)), the percentage of nitrogen derived from the atmosphere, N-fixer or N-fixing substrate abundance, BNF rate per unit of N-fixer abundance, and species identity.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P1MFBVHK", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.66a97365d34e07a119db3a30.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_66a97365d34e07a119db3a30", "keyword": ["Earth", "Land", "N\u2082 fixation", "USGS:66a97365d34e07a119db3a30", "actinorhizal plants", "asymbiotic", "bacteria", "biochemistry", "biogeochemical cycles", "biogeochemical cycling", "biological soil crusts", "biota", "cryptic", "environment", "free-living", "legumes", "lichens", "mosses", "nitrogen", "nitrogen cycle", "nonvascular plants", "nutrient cycling", "rhizobial plants", "soil chemistry", "soil sciences", "symbiosis", "symbiotic", "terrestrial ecosystems", "vascular plants"], "modified": "2025-08-08T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-164.8262, -69.0000, 175.3700, 79.0000", "theme": ["geospatial"], "title": "A global dataset of terrestrial biological nitrogen fixation"}