Control of bush encroachment in Borana zone of southern Ethiopia: effects of different control techniques on rangeland vegetation and tick populationsReportar como inadecuado

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, 4:18

First Online: 25 November 2014Received: 28 September 2014Accepted: 10 October 2014


A study on effects of bush encroachment control techniques on rangeland productivity and tick population dynamics was conducted in Arero district of Borana zone, southern Ethiopia, for three consecutive years. The study targeted two main and dominant encroaching bush species in Borana rangeland, Acacia drepanolobium and Acacia mellifera, and their effects on some vegetation attributes and tick population dynamics. A hectare of rangeland encroached by these two acacia species was replicated-divided into three plots, and each plot was subdivided into five sub-plots to receive five treatments: cutting at 0.5 m above ground and pouring kerosene on stumps T1, cutting at 0.5 m above ground and debarking the stumps down into the soil surface T2, cutting at 0.5 m above ground alone T3, cutting at 0.5 m above ground and dissecting the stumps T4 and control T5. Data on basal and litter covers, soil erosion and compaction, dead and re-sprouted encroaching tree-shrub species and nymph- and adult-stage tick populations were collected before and after treatment applications. The applied treatments significantly influenced p < 0.05 basal cover, nymph- and adult-stage tick population and the two encroaching tree species. The results of this study showed that T3 and T2 were good in controlling A. drepanolobium in that order. T4 and T2 had a significant effect in controlling A. mellifera in their order. Controlling bush encroachment had also a positive effect in eradicating the tick population. The most dominant grass and non-grass species observed after the control actions were Cenchrus ciliaris, Chrysopogon aucheri, Abutilon hirtum, Pennisetum mezianum, Dyschoriste hildebrandtii, Zaleya pentandra and Eragrostis papposa. Therefore, controlling encroaching tree-shrub species had created a conducive grazing area with palatable herbaceous species for the livestock and unequivocally reduced tick population which play a role in reducing cattle milk production through closing off teats. The management of bush encroachment, if sustained, will contribute in stabilizing rangelands and help minimize the negative effects of feed and food crises in the future.

KeywordsBorana Grass and forbs Vegetation dynamics Tick population Electronic supplementary materialThe online version of this article doi:10.1186-s13570-014-0018-1 contains supplementary material, which is available to authorized users.

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Autor: Bikila Negasa - Bedasa Eba - Samuel Tuffa - Barecha Bayissa - Jaldesa Doyo - Nizam Husen


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