Effects of the change of temperature and precipitation in recent 40 years on the agricultural production in Sanhe City

This paper has analyzed the meteorological data between 1960 and 2002 and the results show that the air temperature increases 0.04℃/year and the increasing ratio is winter＞spring＞autumn＞summer; the accumulative temperature is also increasing, the increasing ratio trends towards the total accumulative temperature＞the accumulative temperature not less than 0℃＞the accumulative temperature not less than 10℃; the precipitation in five years decreased about 150mm from the beginning of 1960s to the end of 1990s and the change of precipitation occurd in the summer maize season, and which influenced the plant and growth of winter wheat.