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    • Laboratory optical measurements to assess long-term changes in water-extractable soil organic matter, U.S. Great Plains

    Metadata Updated: January 22, 2026

    Carbon (C) and nitrogen (N) extracted from soil with water are associated with available plant nutrients and microbial activity, but information about how C and N have changed over time in the U.S. Great Plains is sparse. Optical measurements of absorbance and fluorescence were used to compare dissolved organic matter (DOM) extracted from historic (1947) and contemporary (2018) soil samples collected from Moccasin, MT, Akron, CO, and Big Spring, TX. Extracts were prepared at two temperatures (20 and 80 degrees Celsius) associated with different DOM pools to evaluate changes to soil DOM composition after 71 years of dryland farming practices. Together, water extracts and subsequent optical methods can produce insights into long term patterns of soil change while conserving limited and irreplaceable physical samples of archived soil.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date January 13, 2026
    Metadata Updated Date January 22, 2026

    Metadata Source

    Harvested from DOI USGS DCAT-US

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date January 13, 2026
    Metadata Updated Date January 22, 2026
    Publisher U.S. Geological Survey
    Maintainer
    Identifier http://datainventory.doi.gov/id/dataset/USGS_66b66ec8d34eebcf8bb3953b
    Data Last Modified 2025-01-16T00:00:00Z
    Category geospatial
    Public Access Level public
    Bureau Code 010:12
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Datagov Dedupe Retained 20260122015221
    Harvest Object Id 5bbd78e1-c3d2-4119-a37e-b463a2e168ab
    Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
    Harvest Source Title DOI USGS DCAT-US
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": -116.5430, 26.9808, -116.5430, 49.4396, -92.3730, 49.4396, -92.3730, 26.9808, -116.5430, 26.9808}
    Source Datajson Identifier True
    Source Hash f5f68dd8880ffc518aef0fcb38ab9108eae98011743fdebb19368f92f8f0c092
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -116.5430, 26.9808, -116.5430, 49.4396, -92.3730, 49.4396, -92.3730, 26.9808, -116.5430, 26.9808}

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