كليدواژه :
نخود آبي , تغيير اقليم , Tabriz , irrigated and rainfed chickpeas , ديم , رشد و نمو , آفتابگردان
چكيده لاتين :
The present study conducted to evaluate effects of climate changing on yield and other growth characteristics of irrigated and rainfed chickpeas and sunflower. For this, mean monthly climatic variables, temperature, radiation and rainfall, were predicted for Tabriz under doubled CO2 concentration using two general circulation models (GISS and GFDL)I The results were then used to reconstruct long term climatic data of Tabriz. Using these data as the inputs of crop simulation model OSBOL, the effects of climate changing on growth, development, yield and water requirement of chickpeas and sunflower were evaluated. Based on GISS and GFDL predictions mean annual temperature rise was 4.6 and 4.3°C, respectively and mean annual precipitation was increased by 32 and 1%, respectively. However, mean annual radiation was not change in the models prediction. The results obtained by GTSS model showed that doubling CO2 concentration will led to mean temperature rise by 3.7 °C, 40% increase in mean rainfall and a reduction in mean radiation by 3% during the first 5 month of growth. However, the GFDL model predicted an increase in mean temperature and radiation by 4.7°C and 4% respectively and 12% reduction in mean rainfall within the same period. Crop simulation results showed that climate changing caused reduction of day to maturity and harvest index, and increase of yield, biomass and to a lower extent water requirement of irrigated sunflower. In rainfed conditions, increase of sunflower biomass was fallowed by a reduction of days to maturity and harvest index. Yield prediction of simulation model by GISS was in contrast with GFDL model. For irrigated cickpeas, results showed that doubling CO2 concentration led to reduction of days to maturty, biomass, yield and water requirement; but harvest index remaind unchanged. Simulation results indicated that biomass, yield and harvest index of rainfed chickpeas will increase in changing climate conditions, while days to maturity will decrease.
