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Crop responses to climate change

Crop responses to climate change. John R Porter Faculty of Life Sc iences University of Copenhagen Denmark (jrp@life.ku.dk). Issues. Climate variability and crop growth: continuous and threshold responses Crop quality and climate change Conclusions. CO 2 and European Wheat Yields.

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Crop responses to climate change

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  1. Crop responses to climate change • John R Porter • Faculty of Life Sciences • University of Copenhagen • Denmark • (jrp@life.ku.dk) <Udfyld sidefod-oplysninger her>

  2. Issues • Climate variability and crop growth: • continuous and threshold responses • Crop quality and climate change • Conclusions <Udfyld sidefod-oplysninger her>

  3. CO2 and European Wheat Yields Ewert et al. 2004 <Udfyld sidefod-oplysninger her>

  4. Changes in temperature extremes IPCC 2001 <Udfyld sidefod-oplysninger her>

  5. 2003 in Europe Schar et al, 2004 <Udfyld sidefod-oplysninger her>

  6. Wheat: critical temperatures Ferris et al., 1998 <Udfyld sidefod-oplysninger her>

  7. Experimental analysis Wollenweber & Porter 2002 <Udfyld sidefod-oplysninger her>

  8. Modelling analysis Changes in yield CV, % Changes in mean yield, % Porter et al. 2006 <Udfyld sidefod-oplysninger her>

  9. Denmark: anthesis temperatures <Udfyld sidefod-oplysninger her>

  10. IPCC: 2100 1 <Udfyld sidefod-oplysninger her>

  11. Quality <Udfyld sidefod-oplysninger her>

  12. Amount of protein <Udfyld sidefod-oplysninger her>

  13. NAO and wheat grain quality Kettlewell et al 1999 <Udfyld sidefod-oplysninger her>

  14. Changes in temperature extremes <Udfyld sidefod-oplysninger her>

  15. Yield and grain protein CV (%) <Udfyld sidefod-oplysninger her>

  16. Conclusions • CO2 signal relatively weak for crop yields in Europe • Level and distribution of temperature and rainfall are more important • Critical thresholds need identification • Modelling and experimental studies needed • Quantity and quality <Udfyld sidefod-oplysninger her>

  17. <Udfyld sidefod-oplysninger her>

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