Topographic controls on the invasion of Pteronia incana (Blue bush) onto hillslopes in Ngqushwa (formerly Peddie) district, Eastern Cape, South Africa

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dc.contributor.author Kakembo, Vincent en_US
dc.contributor.author Rowntree, K en_US
dc.contributor.author Palmer, Anthony en_US
dc.date.accessioned 2009-06-26T04:11:08Z
dc.date.available 2009-06-26T04:11:08Z
dc.date.issued 2007 en_US
dc.identifier 2006009386 en_US
dc.identifier.citation Kakembo Vincent, Rowntree K, and Palmer Anthony 2007, 'Topographic controls on the invasion of Pteronia incana (Blue bush) onto hillslopes in Ngqushwa (formerly Peddie) district, Eastern Cape, South Africa', Elsevier, vol. 70, no. 2, pp. 185-199. en_US
dc.identifier.issn 0341-8162 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/657
dc.description.abstract The role of topographic factors in the invasion of hillslopes by Pteronia incana, an unpalatable shrub, was investigated. The study combined field observations with image analysis based on high-resolution infrared imagery. A Digital Elevation Model (DEM) of 20 m spatial resolution was used to derive terrain parameters. The Topographic Wetness Index (WI), a component of the TOPMODEL, was derived from the DEM and its relationship with the spatial distribution of P. incana was explored. The absence/presence of P. incana was noted to be strongly influenced by slope angle and aspect. The probability for P. incana occurrence increased with slope steepness and southerly slope orientation. Abandoned and grazing lands were identified as the main invasion hotspots on hillslopes. The combined influence of slope gradient and aspect, and land use was noted to have promoted the invasion. This is borne out by the concentration of the invasion on abandoned steep slopes with a southerly orientation. The WI confirmed the bearing local topographic variations have on P. incana spatial distribution such that, P. incana was associated with the low WI values of convexities. The coupling between local topography and soil surface crusting underpins soil moisture variability. This in turn determines the competition between the patchy P. incana and grass species and the eventual replacement of the latter by the former. Restoration efforts of the invaded lands should focus on trapping of sediment and litter, and moisture retention on the inter-patch bare areas. en_US
dc.publisher Elsevier en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.catena.2006.08.005 en_US
dc.title Topographic controls on the invasion of Pteronia incana (Blue bush) onto hillslopes in Ngqushwa (formerly Peddie) district, Eastern Cape, South Africa en_US
dc.parent Catena en_US
dc.journal.volume 70 en_US
dc.journal.number 2 en_US
dc.publocation Amsterdam, The Netherlands en_US
dc.identifier.startpage 185 en_US
dc.identifier.endpage 199 en_US
dc.cauo.name DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.for 040600 en_US
dc.personcode 0000031993 en_US
dc.personcode 0000031994 en_US
dc.personcode 995490 en_US
dc.percentage 100 en_US
dc.classification.name Physical Geography and Environmental Geoscience en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Vegetation invasion; Land abandonment; Slope; Aspect; Wetness index en_US
dc.staffid 995490 en_US


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