Bush encroachment dynamics and rangeland management implications in southern Ethiopia

Chuan Liao, Patrick E. Clark, Stephen D. DeGloria

    Research output: Contribution to journalArticle

    2 Scopus citations

    Abstract

    Rangelands in southern Ethiopia have been undergoing a rapid regime shift from herbaceous to woody plant dominance in the past decades, reducing indigenous plant biodiversity, altering ecosystem function, and threatening subsistence pastoralism. Despite significant rangeland management implications, quantification of spatial encroachment extent and transitional pathways that result in encroachment remain largely under-explored. This paper develops a phenology-based approach to map rangeland vegetation states in southern Ethiopia, and examines transition pathways among states using the state-and-transition model. The results indicate that nearly 80% of landscape was dominated by woody plants in 2013. While stable encroached states have been established in both high and low lands through different transition pathways between 2003 and 2013, we identified spatial locations where bush encroachment occurred rapidly. The multiplicity in the transition pathways indicates opportunities for positive transformation in the entire rangeland system in southern Ethiopia and other semi-arid regions of Africa.

    Original languageEnglish (US)
    Pages (from-to)11694-11703
    Number of pages10
    JournalEcology and Evolution
    Volume8
    Issue number23
    DOIs
    StatePublished - Dec 2018

    Keywords

    • bush encroachment
    • Ethiopia
    • phenology
    • rangeland
    • state-and-transition model

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Ecology
    • Nature and Landscape Conservation

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