Abstract:

It is very important to understand the impact of abnormal low temperature on crop growth and development under global warming. Based on the agrometeorological observation data of the wheat planting areas in Hebei Province, including temperature, precipitation, sunshine hours and accumulated temperature, and development stages from 2009 to 2011, the effect of the low temperature on the growth and development of winter wheat was analyzed by statistics methods. The results showed that the wheat growth stopping stages before winter was earlier 17 days than normal, but the regrowth stages, jointing and ripen stages were delayed 10, 8, 7 days, respectively, due to low temperatures from Nov. 2009 to Apr. 2010. Because of temperature fluctuations in the spring of 2011, the regrowth, jointing and ripen stages of winter wheat were put off 7, 6, 4 days, respectively. Under the background of climate warming, the growth and development stages of winter wheat were delayed greatly by abnormal weather and climate in the spring season, especially low temperature.