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    • Rangeland Ecology & Management, Volume 62, Number 6 (November 2009)
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    Livestock Browsing, Not Water Limitations, Contributes to Recruitment Failure of Dobera glabra in Semiarid Ethiopia

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    Author
    Tsegaye, Diress
    Moe, Stein R.
    Haile, Mitiku
    Issue Date
    2009-11-01
    Keywords
    Afar pastoralists
    herbivory
    seedling survival
    tree regeneration
    
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    Citation
    Tsegaye, D., Moe, S. R., & Haile, M. (2009). Livestock browsing, not water limitations, contributes to recruitment failure of Dobera glabra in semiarid Ethiopia. Rangeland Ecology & Management, 62(6), 540-549.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643060
    DOI
    10.2111/08-219.1
    Additional Links
    https://rangelands.org/
    Abstract
    The study used nursery and field experiments to investigate why recruitment of Dobera glabra (Forssk) Poir., a native food source for both humans and livestock, often fails in the semiarid rangelands of Afar, Ethiopia. We hypothesized that soil water limitations and browsing by livestock would be the primary mechanisms accounting for the failure of natural regeneration. We used three sets of experiments—1) seedling performance in response to shade and watering in a nursery, 2) field regeneration with and without browsing, and 3) regeneration beneath trees with and without browsing—to examine regeneration success. Seedlings were established in plots from seeds sown directly into the soil for nursery and field experiments, but natural germination occurred beneath trees. Survival and relative growth rates (RGR) were used to monitor seedling performance. Seedlings that received neither shade nor watering treatments had lower seedling survival (53 +/- 15%) as compared with other treatment combinations. Highest seedling survival was recorded under shade and 1 d watering wk-1 treatment combinations (92 +/- 1%). However, shade treatments had a minimal increase on seedling RGR. Water limitation is not a crucial limiting factor for D. glabra recruitment, as 53% of the seedlings survived without both shade and supplemental water for 1 yr. Field experiments, however, demonstrated that browsing greatly reduced seedling survival (below 15%) and suppressed growth of surviving seedlings, suggesting that browsing is the major factor preventing natural recruitment. Natural recruitment of D. glabra is unlikely with the existing continuous and intensive grazing/browsing in Afar rangelands, where the mobility of pastoralists is restricted. We suggest that planting nursery-raised seedlings in home gardens of settled pastoralists and establishment of grazing reserves in some key range sites that contain D. glabra could help offset the recruitment failure of native food species D. glabra in Afar rangelands. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-219.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 6 (November 2009)

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