| Through the observation and analysis for the measured data of winter wheat in four agro-meteorological experiment stations as Yongshou, Fengxiang, Pucheng and Xunyi in the weibei dry plateau areas from 1971 to 2010 and the meteorological data in 30 Counties and City’s Districts in corresponding periods, have obtained that: In recent 40 years, the temperature evidently increased in these areas, especially the temperature increase in Winter and Spring season, were the most remarkable. Affected by climate change, the sowing time and wintering period of the winter wheat was delayed, but the turning green period, jointing stage, heading stage and the maturation period total were advanced. Among them, the turning green stage was the most distinct. Shown by the correlation analysis, except the growth stage before winter, the Wintering period as well as the Spring season, each interval with the average temperature in growth period has close relationship. Furthermore, the relationship in Spring was more obvious than in Winter. But expressed in the growth period interval, the wintering period of winter wheat was obviously decreased. While after turning green period the growth stage interval has no any obvious change. It can be concluded that: The climate warming will be useful the wintering crop to safe in Winter season, also reduce the impact of freeze injury to the agricultural production. Further more the temperature increase will be added the accumulated temperature for the agricultural production, it will be lengthened the crop growth period and useful to increase the multiple crop index. In other hand, because variety rate of temperature in Spring season will be rather big in dry plateau area, so advancing growth stage will cause the increase for the crop freeze risk, especially if the flower stage of the fruit trees suffer the freeze injury, will be cause serious threat for the yield. If the temperature in Winter season continue to increase, will cause the winter wheat stripe rust spore and fruit diseases and pests, to bring big difficulty for the prevention and control of pests and diseases. Therefore, the climate warming will be produced deep influence for the agricultural production in dry plateau, so should be caused high attention. |