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GLAM-wheat modelling in China

This study evaluates the GLAM-Wheat model to assess the impact of temperature and future climate change on wheat production in China. Results show a potential decrease in average wheat yield with rising temperatures and the offsetting effect of CO2, impacting regional wheat yields differently. The study predicts increased yield variability due to climate change.

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GLAM-wheat modelling in China

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  1. Crops and Climate Group GLAM-wheat modelling in China Sanai Li Supervisors: Prof. Tim Wheeler, Dr Andrew Challinor Prof. Julia Slingo,

  2. Outline • Background • GLAM-Wheat model evaluation • Impact of temperature on wheat • Impact of future climate change on wheat

  3. Background 1 Assessment of regional crop production is critical, especially for China

  4. Background 2 Crop model at the field level • Complexity of incorporating the spatial variability of input • High input data requirement • Climate model output is coarse compared with input to the dynamic crop model This method is difficult to apply at a regional level (Yang.P).

  5. \ Development of a large area wheat model-GLAM-WheatGLAM-General Large-Area Model for annual crops • Defining the wheat parameter sets • Quantifying the impact of temperature on crop • Parameterising the CO2 fertilisation effect

  6. Hadley Centre RCM system-Providing Regional Climates for Impacts Studies - PRECIS Observed Annual Tmean (oC), 1961-90 Simulated Annual Tmean (oC), 1961-90 Observed Annual Precipitation (mm/day), 1961-90 Simulated Annual Precipitation (mm/day), 1961-90 From the first China-UK Collaboration Project

  7. Comparison of wheat yield between observations and simulations at the county level

  8. Correlation between observed and simulated yield at the county/city (70-129km) level and field level Significant level Winter wheat Spring wheat

  9. Comparison of simulated and observed wheat yield (kg/ha) at 0.5o scale across China (b) Simulations (a) Observations

  10. Difference between observed and simulated mean wheat yield (%) (correlation r= 0.83,p<0.001)

  11. Cardinal temperature valuesfor selected annual crops underconditions in which temperature is the only limiting variable

  12. The observed impact of temperature on wheat Tendency of temperature from 1951 to 2001(Ren et al, 2003)

  13. The simulated response of wheat yield (%) to an increase in temperature (oC) in China T+2 T+1

  14. Wheat yield change (%) for per 1 oC rise in temperature

  15. Changes in average precipitation (mm day-1) from PRECIS for 2071 to 2099 under the A2 scenario relative to the baseline (1961-1990) (c) A2 MAM (b) A2 DJF (a) A2 Annual (d) A2 JJA (e) A2 SON

  16. Changes in the annual and summer mean temperature (oC) (relative to 1961-1990) for the A2 and B2 scenarios during 2071 to 2099. (d) B2 JJA (b) B2 Annual (c) A2 JJA (a) A2 Annual

  17. The predicted change in the average winter yield during 2072 to 2100 for the A2 and B2 scenarios, relative to the baseline (1961-1990) A2 without the CO2 effect A2 with the CO2 effect B2 without the CO2 effect B2 with the CO2 effect

  18. Predicted changes (relative to baseline) in the coefficient of the variation of winter wheat yield for 2072 to 2100 in the North China Plain

  19. Conclusions • The GLAM model is suitable to simulate crop yield at large scales (approximately 100 km) for regional area, county and global studies of the impacts of climate change • Across China, the simulated average wheat yield would reduce by 4.6-5.7% for each 1 oC rise in mean temperature. • Without the CO2 effect, wheat yield by 2100 is expected to increase by 20-50% in the north of the North China plain, and reduce by 10-40% in the south. The CO2 effect tends to offset the negative impact. • The variability of wheat yield is expected to increase due to an increase in climate variability.

  20. Thanks

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