Adapting dryland agriculture to climate change: Farming implications and research and development needs in Western Australia
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The Western Australian wheat-belt has experienced more rainfall decline than any other wheat-cropping region in Australia. Future climate change scenarios suggest that the Western Australian wheat-belt is likely to see greater future reductions in rainfall than other regions, together with a further increase in temperatures. While these changes appear adverse for water-limited rain-fed agriculture, a close analysis of the changes and their impacts reveals a more complex story. Twentieth century changes in rainfall, temperature and atmospheric CO2 concentration have had little or no overall impact on wheat yields. Changes in agricultural technology and farming systems have had much larger impacts. Contrary to some claims, there is no scientific or economic justification for any immediate actions by farmers to adapt to long-term climate change in the Western Australian wheat-belt, beyond normal responses to short-term variations in weather. Rather than promoting current change, the most important policy response is research and development to enable farmers to facilitate future adaptation to climate change. Research priorities are proposed.
KeywordsClimate Change Soil Organic Carbon Future Climate Change Wheat Yield Global Circulation Model
We thank Dr Stephen Charles from CSIRO for supplying 50 GCM-generated rainfall series covering the period 2001–2050 for Katanning and Nirav Khimashia for assistance with data analysis. David Pannell acknowledges the Australian Research Council for funding.
- Anderson GC, Fillery IRP, Dolling PJ, Asseng S (1998) Nitrogen and water flows under pasture-wheat and lupin-wheat rotations in deep sands in Western Australia. I. Nitrogen fixation in legumes, net N mineralisation, and utilisation of soil-derived nitrogen. Aust J Agric Res 49:329–343CrossRefGoogle Scholar
- Flower K, Crabtree B, Butler G (2008) No-till Cropping Systems in Australia. In: Goddard T, Zoebisch MA, Gan YT, Ellis W, Watson A, Sombatpanit S (eds) 2008 No-till farming systems. Special publication Nº3. World Association of Soil and Water Conservation, Bangkok, pp 457–467Google Scholar
- Hennessy K, Fawcett R, Kirono D, Mpelasoka F, Jones D, Bathols J, Whetton P, Stafford Smith M, Howden M, Mitchell C, Plummer N (2008) An assessment of the impact of climate change on the nature and frequency of exceptional climatic events. CSIRO—Bureau of Meterology. pp. 32.Google Scholar
- IOCI 2002 Climate change in South West Western Australia.Google Scholar
- IPCC (2007) Climate Change 2007. Cambridge Press, USA, New YorkGoogle Scholar
- Keating BA, Carberry PS, Hammer GL, Probert ME, Robertson MJ, Holzworth D, Huth NI, Hargreaves JNG, Meinke H, Hochman Z, McLean G, Verburg K, Snow V, Dimes JP, Silburn M, Wang E, Brown S, Bristow KL, Asseng S, Chapman S, McCown RL, Freebairn DM, Smith CJ (2003) An overview of APSIM, a model designed for farming systems simulation. Eur J Agron 18:267–288CrossRefGoogle Scholar
- Kirkegaard J (2010) data must replace ‘rule of thumb’. Ground Cover, May-June 2010, ISSN 1039–6217, Cadillac Printing, Adelaide, Australia, p. 26–29Google Scholar
- Kingwell R, Hajkowicz S, Young J, Patton D, Trapnell L, Edward A, Krause M, Bathgate A (2003) Economic evaluation of salinity management options in cropping regions of Australia. Grains Research and Development Corporation, Canberra, ACTGoogle Scholar
- Llewellyn RS, D’Emden FH (2009) Adoption of no-till cropping practices in Australian grain growing regions. Grains Research and Development Corporation, CanberraGoogle Scholar
- Stokes C, Howden M (2010) Adapting agriculture to climate change: Preparing Australian agriculture, forestry and fisheries for the future. Adapting agriculture to climate change: Preparing Australian agriculture, forestry and fisheries for the future, viii + 286Google Scholar