The Impact of Global Warming on the Winter Wheat Production of China

The impact of global warming on crop growth periods and yields has been evaluated by using models, which need to provide various kinds input datasets estimate numerous parameters before simulation. Direct studies the changes climatic factors observed yield could a more simple intuitive way for assessing climate change production. In this study, four cultivars were planted over than 15 years in eight test stations Northern Winter Wheat Region China selected investigate relationships between periods, grain yields, components temperatures. It was found that average temperatures heat degree-days (HDD) during winter wheat growing seasons tended increase time series at most study sites. length period degree days (GDD) not fixed given cultivar among different locations, variation from sowing jointing relatively greater other periods. increasing temperature mainly shortened anthesis, led decrease entire Positive spike number, number per spike, identified China. area increased 406.3 kg ha?1 each 1 °C temperature. Further, although positive relationship HDD our stress did lead decline region. Temperature is major determinant development, frequency stresses are projected future, so understanding effect production adopting appropriate adaptation required implementation food security policies.