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Browsing by Author "Scholes, RJ"

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  • Scholes, RJ; Kuper, W; Biggs, R (2006)
    Biodiversity offers multiple opportunities for development and improving human well-being. It is the basis for essential environmental services upon which life on Earth depends. Thus, its conservation and sustainable use ...
  • Scholes, RJ; Biggs, R (Nature Publishing Group, 2005-03-03)
    The nations of the world have set themselves a target of reducing the rate of biodiversity loss by 2010. Here, we propose a biodiversity intactness index (BII) for assessing progress towards this target that is simple and ...
  • Biggs, R; Reyers, B; Scholes, RJ (Acad Science South Africa A S S AF, 2006-07)
    South Africa's new Biodiversity Act requires the development of a national framework for the integrated management of biodiversity in the country. The act also requires regular monitoring and reporting of the status of ...
  • Von Maltitz, Graham P; Scholes, RJ (Kluwer Academic Publishers, 1995-11)
    Fuel wood harvesting is considered sustainable when consumption is equal to or less than production. An empirical model was developed to estimate potential fuel wood production from savannas. The model is based on the ...
  • Nickless, A; Scholes, RJ; Archibald, S (CSIR, 2010-09-01)
    Often researchers are interested in obtaining estimates of variables which are quite difficult or expensive to measure. To obtain these estimates, relationships between those variables of interest and more easily measured ...
  • Wessels, Konrad J; Van den Bergh, F; Scholes, RJ; Miteffa, S (2011-04)
    There 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, ...
  • Scholes, RJ; Bailey, CL (Bureau Scientific Publications, 1996-02)
    This article discusses the South African Greenhouse Experiment on Savannas (SAGES) study conducted by the CSIR' Division of Forest Science and Technology (Foretek) on the role of savannas in the balance of the greenhouse ...
  • Scholes, RJ; Frost, PGH; Tian, Y (Blackwell Publishing Ltd, 2004-03)
    Measurements of tree canopy architecture were made at six savanna sites on deep, sandy soils, along a gradient of increasing aridity. There was substantial variation in the leaf area estimated within each site, using the ...
  • Christie, SI; Scholes, RJ (Kluwer Academic Publishers, 1995-11)
    Carbon (C) is stored by plantation forests either when ecosystems with a low C density (such as tropical grasslands) are afforested or when timber is converted to semi permanent products. If the afforestation rate is ...
  • Archibald, S; Nickless, A; Govender, N; Scholes, RJ; Lehsten, V (Wiley-Blackwell, 2010-11)
    This study investigates inter-annual variability in burnt area in southern Africa and the extent to which climate is responsible for this variation. We compare data from long-term field sites across the region with remotely ...
  • Scholes, RJ; Noble, IR (American Association for the Advancement of Science, 2001-11-02)
    The terrestrial biosphere currently absorbs about a quarter of the anthropogenic carbon emissions. Can this carbon sink help to mitigate climate change? In their Perspective, the authors argue that the world will not be ...
  • House, JI; Archer, S; Breshears, DD; Scholes, RJ (Blackwell Publishing Ltd, 2003-11)
    The article aims to identify approaches to improve our understanding of, and predictive capability for, mixed tree-grass systems. Elucidation of the interactions, dynamics and determinants, and identification of robust ...
  • Scholes, RJ (Kluwer Academic Publishers, 2003-12)
    The relationship between grass production and the quantity of trees in mixed tree-grass ecosystems (savannas) is convex for all or most of its range. In other words, the grass production declines more steeply per unit ...
  • Roux, JR; Nel, JL; Ashton, PJ; Deacon, AR; de Moor, FC; Hardwick, D; Hill, Liesl; Kleynhans, CJ; Maree, GA; Moolman, J; Scholes, RJ (Elsevier Science B.V, 2008-01)
    The process of designing protected areas to represent all ecosystems in an area adequately is becoming increasingly sophisticated. To date freshwater aquatic ecosystems have seldom been considered in this process. How much ...
  • Sankaran, M; Hanan, NP; Scholes, RJ; Ratnam, J; Augustine, DJ; Cade, BS; Gignoux, J; Higgins, SI; Le Roux, X; Ludwig, F; Ardo, J; Banyikwa, F; Bronn, A; Bucini, G; Caylor, KK; Coughenour, MB; Diouf, A; Ekaya, W; Feral, CJ; February, EC; Frost, PGH; Hiernaux, P; Hrabar, H; Metzger, KL; Prins, HHT; Ringrose, S; Sea, W; Tews, J; Worden, J; Zambatis, N (Nature Publishing Group, 2005-12-08)
    Savannas are globally important ecosystems of great significance to human economies. In these biomes, which are characterized by the co-dominance of trees and grasses, woody cover is a chief determinant of ecosystem ...
  • Scholes, RJ; Loreau, M; Oteng-Yeboah, A; Arroyo, MTK; Babin, D; Barbault, R; Donoghue, M; Gadgil, M; Häuser, C; Heip, C; Larigauderie, A; Ma, K; Mace, G; Mooney, HA; Perrings, C; Raven, P; Sarukhan, J; Schei, P; Watson, RT (Nature Publishing Group, 2006-07)
    Since the 1992 United Nations ‘Earth Summit’ conference in Rio de Janeiro, Brazil, biodiversity has received increasing attention from scientists, governments and the public worldwide. There is growing recognition that the ...
  • Archibald, SA; Kirton, A; Van der Merwe, Martina R; Scholes, RJ; Williams, CA; Hanan, N (Copernicus Publications, 2009)
    Inter-annual variability in primary production and ecosystem respiration was explored using eddy-covariance data at a semi-arid savanna site in the Kruger Park, South Africa. New methods of extrapolating night-time respiration ...
  • Scholes, RJ; Van Breemen, N (Elsevier Science BV, 1997-09)
    Alteration of land use will continue to be the dominant driver of environmental change in the tropics for the next several decades. It can take the form of fundamental vegetation cover transformation, or of intensification ...
  • Scholes, RJ; Mennell, K (Wits University Press, 2008)
    As a conse quence of the rising number of elephants in protected areas in South Africa, the ecosystems that contain elephants and the people that live adjacent to elephant populations are perceived to be coming under ...
  • Nickless, A; Archibald, SA; Van der Merwe, Martina R; Scholes, RJ; Williams, CA; Hanan, N (2011-03)
    Annual estimates of gross primary production (GPP) and ecosystem respiration (Reco) were obtained for the Skukuza flux site, Kruger Park, South Africa, based on the eddy covariance flux data. A new method of extrapolating ...