risk assessment of climate change impacts on production and phenology of wheat (case study: ahvaz region)

in recent years, human activities has resulted increases in atmospheric carbon dioxide (co2) concentration. increase in [co2] has caused global warming and climate change. the aim of this study was to assess potential climate change impact on production for one of the most important varieties of wheat (chamran) in ahvaz region. for this purpose, thirteen aogcm models and two greenhouse gases emission (ghg) scenarios (a2 and b1) was selected. daily temperature and precipitation data were calculated for two future periods (2015-2045 and 2070-2099) under five probability levels (0.10, 0.25, 0.50, 0.75 and 0.90). the combination of temperature and precipitation scenarios resulted in 50 climate change scenarios under each ghg emissions scenario (a2 and b1). wheat growth was simulated for the baseline period (1980-2010) and future periods (2015-2045 and 2070-2100) using calibrated and validated ceres-wheat model. results showed the length of growing season is shortened as a result of climate change affects, especially in the 2070-2100 periods. comparing of wheat yield in climate change conditions with base period, showed that wheat yield in 2015-2045 and 2070-2100 is decreased about 4 and 15 percent, respectively.