Rangeland Modelling Group

Publications

Recent work

  1. Richardson F D, B D Hahn and P I Wilke (1991). A model for the evaluation of different production strategies for animal production from rangeland in developing areas: an overview. Journal of the Grassland Society of Southern Africa 8, 153-159.

  2. Richardson, F.D. and Hahn, B.D. 1994. Models for the selection of cow types for extensive meat and milk production in developing areas. Pastoral Development Network Paper 36d. Overseas Development Institute, London, 27pp.

  3. Richardson, F.D. (1994). The needs of readers. Invited Editorial. British Journal of Nutrition 72: 795-797.

  4. Hahn, B.D.,  Richardson, F.D. and Starfield, A.M. (1999). Frame-based modelling as a method of simulating rangeland production systems in the long term. Agricultural Systems 62, 29-49.

  5. Richardson F D, B D Hahn and Schoeman, S.J. (2000). Modelling nutrient utilization by livestock grazing semi-arid rangeland. In Modelling Nutrient Utilization in Farm Animals ed. J P McNamara, J France and D Beever, CABI Publishing, Wallingford UK and New York, 263-280.

  6. Witten G Q and Richardson, F.D. (2000). Modelling nutrient utilization in growing cattle subjected to short or long periods of moderate to severe undernutrition. In Modelling Nutrient Utilization in Farm Animals, ed. J P McNamara, J France and D Beever, CABI Publishing, Wallingford UK and New York, 241-252.

  7. Witten G Q and F D Richardson (2000). Dynamic control of ammonia and urea diffusion across the rumen wall. Mathematical Modelling in Nutrition and the Health Sciences (Penn State University, USA, July 29 - August 1).

  8. Witten G Q (2000). Modelling the control of energy partitioning between protein and fat during undernutrition. International Conference on Mathematical Biology (University of Utah, USA, August 3-5).

  9. Witten, G.Q (2002). Mathematical models of physiological mechanisms affecting the adaptation of growing cattle during and after a period of under-nutrition. PhD Thesis, University of Cape Town (unpublished).

  10. Chawatama S, Ndlovu, L.R., Richardson, F.D., Mhlanga, F. and Dzama, K. (2003a). A simulation model of draught animal power in smallholder farming systems. Part I: Context and structural overview. Agricultural Systems 76, 415-440.

  11. Chawatama S, Ndlovu, L.R., Richardson, F.D., Mhlanga, F. and Dzama, K. (2003). A simulation model of draught animal power in smallholder farming systems. Part II: Model evaluation and application. Agricultural Systems 76, 441-455.

  12. Richardson F D, B D Hahn and M T Hoffman (2003). Modelling the dynamics of a Namaqualand pastoral system. Proceedings of the VIIth International Rangeland Congress (Durban, July 26–August 1), African Journal of Range & Forage Science 20(2):142.

  13. Witten, G.Q. and Richardson, F.D. (2003). Competition of three aggregated microbial species for four substrates in the rumen. Ecological Modelling, 164: 121-135.

  14. Richardson F D, Hahn, B.D. and Hoffman, M.T. (2004). Understanding arid and semi-arid grazing systems: why both equilibrium and non-equilibrium concepts are inadequate. In: S. Vetter (Editor), Rangelands at equilibrium and non-equilibrium, Programme for Land and Agrarian Studies, School of Government, University of the Western Cape, CapeTown, pp. 17–29.

  15. Richardson F D (2004). Simulation models of rangeland production systems: simple and complex. PhD thesis, University of Cape Town (unpublished).

  16. Hahn B D, Richardson, F.D., Hoffman, M.T., Roberts, R,. Todd, S.W. and Carrick, P. (2005). A simulation model of long-term climate, livestock and vegetation interactions on communal rangelands in the semi-arid Succulent Karoo, Namaqualand, South Africa. Ecological Modelling, 183: 211-230.

  17. Richardson F D, Hahn, B.D., and Hoffman, M.T. (2005). On the dynamics of grazing systems in the semi-arid succulent Karoo: The relevance of equilibrium and non-equilibrium concepts to the sustainability of semi-arid pastoral systems. Ecological Modelling, 187(4): 491-512.

  18. Richardson, F.D. and Smith, A. J. (2006). Beef Published by Macmillan Education in co-operation with The Technical Centre for Agricultural and Rural Co-operation (CTA). ISBN 0-333-59833-4. 120 pages

  19. Richardson, F.D. and Hahn, B.D. (2007a). A short-term mechanistic model of forage and livestock in the semi-arid Succulent Karoo: 1. Description of the model and sensitivity analyses. Agricultural Systems, 95: 49-61.

  20. Richardson, F.D. and Hahn, B.D. (2007b). A short-term mechanistic model of forage and livestock in the semi-arid Succulent Karoo: 2. Evaluation and application. Agricultural Systems, 95: 62-75.

  21. Richardson, F.D., Hahn, B.D. and Hoffman, M.T. (2007). Modelling the productivity and sustainability of pastoral systems in the communal areas of Namaqualand. Journal of Arid Environments, 70: 701-717.

  22. Richardson, F.D. (2009). Modelling the long-term consequences of under-nutrition of cows grazing semi-arid range for the growth of their progeny. South African Journal of Animal Science. 39: (Supplement 1—10th World Conference on Animal production: Guest Editor: Prof. N.H. Casey) Pages 202-205.

  23. Richardson, F.D., Hoffman, M.T. and Gillson. L. (2010) Modelling the complex dynamics of vegetation, livestock and rainfall in a semi-arid rangeland in South Africa. African Journal of Range &Forage Science. 27: 125-142.

  24. Kazembe, J.A. (2010) Modelling the Influence of Rainfall Variability and Different Grazing Systems on the Spatiotemporal Dynamics and Productivity of Semiarid Rangelands. PhD Thesis, University of Cape Town (Unpublished).

  25. Richardson, F.D. and Hoffman, M.T.(2011) Using models to predict the probability of degradation of rangelands when subjected to different management strategies. In: Observations on Environmental Change in South Africa, Zietsman L (ed), p 109-115. South African Environmental Observation Network, Pretoria. 303 pp.