关键词: 山区冬小麦, 关键发育期, 产量, 降水影响

Abstract:

We selected the measurement data of winter wheat and precipitation observations from March to May in Guyuan and Longde as statistical samples to analyze the impact of precipitation on growing periods of winter wheat and climatic productions by using correlation analysis method． Results show that the effective precipitation was the most important factor for the climate output of the winter wheat． If the precipitation was over 3 mm in every ten － day in March，the winter wheat would start to grow in Guyuan region． In Longde，the precipitation over 5 mm in the second ten － day and 3 mm in the last ten － day of March correlated positively with growing period
of winter wheat． The late growth period anomaly of winter wheat in Guyuan highly related to the precipitation in May． The climate outputs of winter wheat in south mountain region correlated positively with precipitation in the last ten － day of March and the second
and the last ten － day of May． And in the south mountain region，the influence of less precipitation was more obvious than that of more
precipitation in spring on winter wheat outputs． During the late growth period，the precipitation was main influence factor for winter
wheat outputs．

Key words: winter wheat, mountain region, key growing period, yield, precipitation, influence