Research On The Impact Of Climate Changing On Winter Wheat Variet Y Evolution In Northern Winter Wheat-production Areas

Northern winter wheat area and Huang-Huai winter wheat area are included in Northernwinter wheat production area, which is the most important grain production base and plays anirreplaceable role to guarantee food security in China. In this paper, agronomic traits dataabout check variety of irrigated land in northern winter wheat area from2001to2009, dryland in northern winter wheat area from2001to2010and north area of HuangHuai from2001to2010were analyzed, the correlation analysis were done in this paper, scientificevidence of the variety improving is provided for different wheat production areas in future.The main results are as follow:1. Emergence date was later, growth period was shorten and maturity date was laterbecause of climate warming.Under the background of climate warming, for check variety of irrigation group, itsemergence and maturity date were later; growth period was shorten, there were negativecorrelation with annual average temperature and≥0℃accumulated temperature in growthperiod, reproductive growth stage tended to be longer.2. With climate warming, yield per unit area of check varieties in northern winterwheat-production areas were wholly increased.3.1000-kernal weight, kernels per spike and the length of reproductive growth stage ofcheck varieties in Northern winter wheat production area were the mainly factors thatinfluenced yield.For the check variety in irrigated land in northern winter wheat area, the yield per unitarea had positive correlation significantly with1000-kernal weight (r=0.963^**) and positivecorrelation with the length of reproductive stage（r=0.571）; For the check variety in dry land innorthern winter wheat area, the yield per unit area had positive correlation with1000-kernalweight （r=0.685^*）. Accordingly,1000-kernal weight and the length of reproductive growthstage were regarded as the mainly factors that influenced yield.For the check variety in irrigated land in HuangHuai winter wheat area, the yield perunit area had positive correlation significantly with kernels per spike(r=0.815^**).4. Winterness of winter wheat variety was reduced and springness was stronger due to climate warming.Annual precipitation was decrease and annual average temperature was raised slowly indry land in northern winter wheat area, Check variety has been changed from strongwinterness variety-Xifeng20to winterness variety-Chang6878, yield per unit area wasincrease because that winterness of winter wheat variety was reduced and springness wasstronger.In conclusion, under the background of climate warming, for the winter wheat varietiesof northern winter wheat production area, yield per unit area was increased because that itsspringness was stronger,1000-kernal weight and kernels per spike were increased, there wasvery important practical significance for breeding targets and variety change.