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Lohmann, D., Tietjen, B., Blaum, N., Joubert, D.F. and Jeltsch, F. 2014. Prescribed fire as a tool for managing shrub encroachment in semi-arid savanna rangelands. Journal of Arid Environments, 107: 49–56


Description:

Prescribed fire as a tool for managing shrub encroachment in semi-arid savanna rangelands.

Summary / Notes:

Savanna rangelands worldwide are threatened by shrub encroachment, i.e. the increase of woody plant species at the cost of perennial grasses, causing a strong decline in the productivity of domestic livestock production. Although recent studies indicate that fire might be of great importance for semi-arid and arid savanna dynamics, it is largely not applied in the management of semi-arid rangelands especially with regard to woody plant control. We used the eco-hydrological savanna model EcoHyD to simulate the effects of different fire management strategies on semi-arid savanna vegetation and to assess their long-term suitability for semi-arid rangeland management. Simulation results show that prescribed fires, timed to kill tree seedlings prevented shrub encroachment for a broad range of livestock densities while the possible maximum long-term cattle densities on the simulated semi-arid rangeland in Namibia increased by more than 30%. However, when grazing intensity was too high, fire management failed in preventing shrub encroachment. Our findings indicate that with regard to fire management a clear distinction between mesic and more arid savannas is necessary: While the frequency of fires is of relevance for mesic savannas, we recommend a fire management focussing on the timing of fire for semi-arid and arid savannas. Keywords: Acacia mellifera, Bush encroachment, Dryland degradation, Rangeland management, Simulation model, Southern Africa.

Year: 2014

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/S0140196314000846


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Lohmann, D., Tietjen, B., Blaum, N., Joubert, D.F. and Jeltsch, F. 2014. Prescribed fire as a tool for managing shrub encroachment in semi-arid savanna rangelands. Journal of Arid Environments, 107: 49–56
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