Abstract: The variation of agricultural climatic elements during winter wheat growing season and its impact on wheat production were analyzed and discussed based on daily meteorological data of 48 meteorological stations in the North China Plain (NCP),and crop data from 6 typical agro meteorological observation stations.The results showed that average temperature increased at the rate of 0.37℃·10y-1(P<0.05) during whole growing season,and increased at the rate of 0.53,0.49 and 0.39℃·10y-1 from overwintering to regreening, regreening to jointing and jointing to flowering respectively.97.9%, 75.0% and 79.2% of stations showed obvious temperature increasing.Average minimumtemperature increased more obvious than average maximum temperature,which caused the decrease in the daily temperature range.Daily temperature range decreased at the rate of 0.19℃·10y-1 during whole growing season,and decreased at the rate of 0.25℃·10y-1 from overwintering to regreening and 0.26℃·10y-1 from flowering to maturity.The precipitation change was not significant during whole growing season and each development stage.The radiation decreased at the rate of 54.02MJ·m-2·10y-1during whole growing season,and decreased at the rate of 15.74,20.09 and 12.00MJ·m-2·10y-1 from sowing to overwintering,overwintering to regreening and flowering to maturity respectively.The radiation decreased significantly in central NCP.The results are helpful to rational distribution of winter wheat and farming management.

Key words: North China Plain, Winter wheat, Growing period, Climate warming