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de Wet, M.J. 2015. Harvesting of encroacher bush: Compendium of harvesting technologies for encroacher bush in Namibia. Support to De-bushing Project, Ministry of Agriculture, Water and Forestry/Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, Windhoek, Namibia


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Harvesting of encroacher bush: Compendium of harvesting technologies for encroacher bush in Namibia.

Summary / Notes:

Bush encroachment is severely hampering the red meat industry of Namibia and it is also negatively affecting biodiversity and the recharging tempos of certain aquifers. More than 26 million hectares of Namibian rangelands and savannah has been degraded by encroacher bush. There is a considerable market demand for biomass in the world and the use of waste wood or unwanted woody biomass has become a sought after commodity, mainly because of its low to positive impact on the environment when used as a heat source. The removal of encroaching bush from the Namibian rangelands would not only be regarded as an attempt to restore the savannah and its biodiversity, it would also be advantages to the subsurface water resources of affected areas. It is therefore important that methods to economically harvest biomass from encroaching bush need to be highlighted and documented. The purpose of this assignment is thus to compile a Compendium or abbreviated reference document for farmers, companies and groups looking to invest in their debushing capacities. The Consultants' primary aim is therefore to pay special attention to harvesting methods of encroacher bush at tempos which could economically produce clean and chipped biomass yielding from a few tonnes per day up to 100 and more tonnes per day from a single "harvesting train" of equipment.

Year: 2015

Type: Report

Download: de Wet - Harvesting Technologies for Encroacher Bush 2016.pdf (5.76 mb)

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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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Kauatjirue, J., Shamathe, K., Pringle, H.J.R. and Zimmermann, I. 2009. Pilot restoration project in a key fertile valley of the Highland Savanna. 13th Namibian Rangeland Forum - The role of biodiversity in rangeland management and policy, Neudamm Faculty of Agriculture and Natural Resources, Windhoek, Dates: 27-29 October 2009
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Tjilumbu, L. and Zimmermann, I. 2009. The influence of patch burning in the Thornbush savanna. 13th Namibian Rangeland Forum - The role of biodiversity in rangeland management and policy, Neudamm Faculty of Agriculture and Natural Resources, Windhoek, Dates: 27-29 October 2009
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Trede, R. and Patt, R. 2015. Value added end-use opportunities for Namibian encroacher bush. Support to De-bushing Project, Ministry of Agriculture, Water and Forestry/Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, Windhoek, Namibia
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van Eck, J.A.J. and Swanepoel, D.J. 2008. Chemical Bush Control on various invader species, using diferent arboricides and control methods - an analysis. Agricola, 18: 37-50
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Strohbach, B.J. 1998/99. The effects of season and treatment on the survival rate and coppicing ability of five encroaching woody species. I: The effect of felling heights. Agricola, 10: 99-105
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1998Ministry of Agriculture, Water and ForestryJournal Article4.77 mb pdf
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Strohbach, B.J. 1998/1999. The effects of season and treatment on the survival rate and coppicing ability of five encroaching woody species. II: The effect of fire-girdling. Agricola, 10: 107-112
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Strohbach, B.J. 2000. Vegetation degradation trends in the northern Oshikoto Region: II. The Colophospermum mopane shrublands. Dinteria, 26: 63-75
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Strohbach, B.J. 2000. Vegetation degradation trends in the northern Oshikoto Region: III. The Terminalia prunioides woodlands and Andoni grasslands. Dinteria, 26: 77-92
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Stehn, H. 2008. Rangeland management
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Strohbach, B.J., Ntesa, C., Kabajani, M.W., Shidolo, E.K. and D'Alton, C.D. 2015. Prosopis encroachment along the Fish River at Gibeon, Namibia. I. Habitat preferences, population densities and the effect on the environment. Dinteria, 35: 53-73
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Buyer, J.S., Schmidt-Küntzel, A., Nghikembua, M., Maul, J.E. and Marker, L.L. 2016. Soil microbial communities following bush removal in a Namibian savanna. SOIL, 2: 101–110
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Wagner, T.C., Hane, S., Joubert, D.F. and Fischer, C. 2016. Herbaceous legume encroachment reduces grass productivity and density in arid rangelands. PLoS ONE, 11(11): e0166743
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Joubert, D., Rust, A., Smit, G., and Hoffman, M. 2017. Growth rates and mortality patterns of Acacia mellifera subsp. detinens in the semi-arid Highland Savanna, Namibia: Encroachment is not as rapid as previously believed. Namibian Journal of Environment, 1(A): 1-5
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