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dc.contributor.authorHaussmann, N.S.
dc.contributor.authorKalwij, J.M.
dc.contributor.authorBezuidenhout, S.
dc.date.accessioned2015-11-04T09:31:50Z
dc.date.available2015-11-04T09:31:50Z
dc.date.issued2016
dc.identifier.citationHaussmann, N.S.; Kalwij, J.M.; Bezuidenhout, S. (2015) Some ecological side-effects of chemical and physical bush clearing in a southern African rangeland ecosystem. South African Journal of Botany.en
dc.identifier.issn0254-6299en
dc.identifier.urihttp://hdl.handle.net/123456789/1880
dc.description.abstractBush thickening is a major concern to farmers of arid and semi-arid rangelands; reactive intervention remains the norm. Here we compared some of the short-term ecological implications of chemical and physical removal of the bush encroacher Acacia mellifera in the central Highland savanna of Namibia.We selected 21 invaded sites, 7 had been chemically cleared, 7 had been physically cleared and 7 had never been cleared. From each site,we recorded grass species composition, as well as the densities of A. mellifera, the undesired perennial shrub Pechuel-loeschea leubnitziae and a non-targeted tree Acacia erioloba, 24–30 months post-treatment. We fitted one-way ANOVA models to test for the effect of treatment on grass species richness and density of targeted and non-targeted tree species. A canonical correspondence analysis was used to determine how treatment affected grass species composition. While both treatments reduced the density of the bush encroacher, P. leubnitziae effectively replaced A. mellifera in chemically treated sites, where die-back presumably happened faster and nutrient and water competition decreased more rapidly. In such sites, perennial grass species were effectively outcompeted by P. leubnitiziae.en
dc.format.extent694111 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.subjectAcacia giraffaeen
dc.subjectBush encroachmenten
dc.subjectNamibiaen
dc.subjectPhysical soil disturbanceen
dc.subjectSage bushen
dc.subjectSavannahen
dc.subjectSenegalia melliferaen
dc.subjectVachellia eriolobaen
dc.titleSome ecological side-effects of chemical and physical bush clearing in a southern African rangeland ecosystemen
dc.typeJournalArticlesen
dc.cibjournalSouth African Journal of Botanyen
dc.cibprojectNAen


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