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    • Rangeland Ecology & Management, Volume 59, Number 6 (November 2006)
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    Soil Erosion Thresholds and Alternative States in Northeastern Patagonian Rangelands

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    Author
    Chartier, Marcelo P.
    Rostagno, César M.
    Issue Date
    2006-11-01
    Keywords
    ecological thresholds
    indicators
    range condition
    sediment production
    state-and-transition models
    vegetation dynamics
    
    Metadata
    Show full item record
    Citation
    Chartier, M. P., & Rostagno, C. M. (2006). Soil erosion thresholds and alternative states in northeastern Patagonian rangelands. Rangeland Ecology & Management, 59(6), 616-624.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643114
    DOI
    10.2111/06-009R.1
    Additional Links
    https://rangelands.org/
    Abstract
    In semiarid rangelands, continuous grazing may decrease vegetation cover, accelerating soil erosion and eventually causing a transition to an alternative, degraded state. State-and-transition models invoke process-based explanations of alternative states, but there are few examples that use empirical data on key factors and processes. We used rainfall simulation to determine 1) the relationships between soil surface characteristics and interrill erosion in 3 spatially related plant communities: stable grass with scattered shrubs (GS), degraded grass with scattered shrubs (DGS), and degraded shrub steppes (DSS), and 2) the site conservation threshold (SCT) of this rangeland. We also analyzed the effect of past erosion on soil and vegetation characteristics. In the GS, sediment production and sediment concentration were significantly lower (P<0.05) than in the DGS and the DSS.The main soil protection factors in the GS and in the DGS were perennial grass and litter cover, while in the DSS, gravel cover became the main soil protection factor. The SCT, the point at which the rate of soil erosion increases markedly, corresponded to a plant-and-litter cover close to 90% and occurred within the DGS. Although this plant community may reverse back to the conserved GS, long-term accelerated erosion may result in enough soil loss to trigger irreversible changes and prompt the transition to the DSS. The threshold underlying this transition would be reached when the A horizon is severely reduced by erosion. Under these conditions, the soil hydrological properties are affected irreversibly, preventing perennial grass establishment. While the GS represents a resource conserving plant community, desirable for both forage production and soilprotection, the DSS represents a dysfunctional state with a minimum forage value. The DGS represents an unstable and transitional community that, without management intervention to halt soil erosion, will likely change into the DSS.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/06-009R.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 59, Number 6 (November 2006)

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