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    • Rangeland Ecology & Management, Volume 64 (2011)
    • Rangeland Ecology & Management, Volume 64, Number 2 (March 2011)
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    Transition From Sagebrush Steppe to Annual Grass (Bromus tectorum): Influence on Belowground Carbon and Nitrogen

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    Author
    Rau, Benjamin M.
    Johnson, Dale W.
    Blank, Robert R.
    Lucchesi, Annmarrie
    Caldwell, Todd G.
    Schupp, Eugene W.
    Issue Date
    2011-03-01
    Keywords
    biogeochemical cycles
    carbon sequestration
    cheatgrass
    climate change
    invasive annual grass
    sagebrush
    soil organic carbon
    total nitrogen
    
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    Citation
    Rau, B. M., Johnson, D. W., Blank, R. R., Lucchesi, A., Caldwell, T. G., & Schupp, E. W. (2011). Transition from sagebrush steppe to annual grass (Bromus tectorum): influence on belowground carbon and nitrogen. Rangeland Ecology & Management, 64(2), 139-147.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642852
    DOI
    10.2111/REM-D-10-00063.1
    Additional Links
    https://rangelands.org/
    Abstract
    Vegetation changes associated with climate shifts and anthropogenic disturbance have major impacts on biogeochemical cycling. Much of the interior western United States currently is dominated by sagebrush (Artemisia tridentata Nutt.) ecosystems. At low to intermediate elevations, sagebrush ecosystems increasingly are influenced by cheatgrass (Bromus tectorum L.) invasion. Little currently is known about the distribution of belowground organic carbon (OC) on these changing landscapes, how annual grass invasion affects OC pools, or the role that nitrogen (N) plays in carbon (C) retention. As part of a Joint Fire Sciences-funded project called the Sagebrush Treatment Evaluation Project (SageSTEP), we quantified the depth distribution of soil OC and N at seven sites experiencing cheatgrass invasion. We sampled plots that retained sagebrush, but represented a continuum of cheatgrass invasion into the understory. Eighty-four soil cores were taken using a mechanically driven diamond- tipped core drill to a depth of 90 cm, or until bedrock or a restrictive layer was encountered. Samples were taken in 15-cm increments, and soil, rocks, and roots were analyzed for OC and total N. We determined that cheatgrass influences the vertical distribution of OC and N within the soil profile and might result in decreased soil OC content below 60 cm. We also found that OC and total N associated with coarse fragments accounted for at least 10% of belowground pools. This emphasizes the need for researchers to quantify nutrients in deep soil horizons and coarse fragments.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-10-00063.1
    Scopus Count
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    Rangeland Ecology & Management, Volume 64, Number 2 (March 2011)

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