Author:Wessels, Konrad J; Van den Bergh, F; Scholes, RJ; Miteffa, SDate:Apr 2011There has been a recent proliferation of remote sensing-based trend analysis for monitoring regional desertification. These show contradictory results. All of them claim to have been “validated” through expert interpretation, in the absence ...Read more
Author:CSIRDate:Mar 2009'S&T for global impact', the theme of this ScienceScope, features a selection of multidisciplinary projects with collaborators outside South Africa's borders from as near-by as Namibia to as far away as Russia and the Caribbean. CSIR's work ...Read more
Author:Prince, SD; Wessels, Konrad J; Tucker, CJ; Nicholson, SEDate:Jul 2007In semiarid regions the ratio of annual net primary production to precipitation, rain-use efficiency (RUE), has been used as an index of desertification. In a recent publication (Hein & de Ridder, 2006) it was proposed that an incorrect ...Read more
Author:Audouin, Michelle ADate:Jan 2007Unsustainable agricultural practices have had a role to play in the degradation of land on which agriculture depends. South Africa has an international obligation to develop a National Action Programme (NAP), the purpose of which is to identify ...Read more
Author:Wessels, Konrad J; Van den Bergh, F; Scholes, RJDate:Oct 2012This paper demonstrates a simulation approach for testing the sensitivity of linear and non-parametric trend analysis methods applied to remotely sensed vegetation index data for the detection of land degradation. The intensity, rate and ...Read more
Author:Wessels, Konrad JDate:2011In South Africa, land degradation in rangelands has been regarded as a major environmental problem for many years. During the last ten years, attention focussed on the land degradation in the former homelands, now communal lands. There is an ...Read more
Author:Wessels, Konrad J; Prince, SDate:2007Desertification is defined by the United Nations Convention to Combat Desertification (UNCCD) as ‘land degradation in arid, semi-arid and dry sub-humid areas (dry-lands) resulting from various factors, including climatic variations and human ...Read more