Abstract: Based on daily meteorological data including temperature,precipitation and sunshine duration and maize yield in Jinzhou from 1981 to 2010,using correlation analysis,running average and Mann-Kendall test methods,the change trends of meteorological factors and their relationships with maize meteorological yield were investigated.The results show that the daily maximum and minimum temperature,the active accumulated temperature ≥ 0℃ increase with a rate of 0.359℃/10 a,0.461℃/10 a,64.593 (℃·d)/10 a,while daily temperature difference and sunshine duration decrease with a rate of -0.102℃/10 a and -0.139 h/10 a and precipitation changes with a rate of 4.183 mm/10 a in Jinzhou during recent thirty years,respectively.Meanwhile,there is no obvious abrupt climate changes for temperature and precipitation,while the abrupt change points for sunshine duration appear in 1982,1985 and 1986.In addition,the daily maximum temperature and the active accumulated temperature ≥ 0℃ increase significantly after 2000 and 2001,respectively.Inversely,all of the other factors do not show significantly abrupt climate changes.Moreover,small bell and flare opening,as well as tasseling stage,are the key periods when maize meteorological yield is susceptible.The major meteorological factors affecting maize meteorological yield are the daily maximum temperature,active accumulated temperature ≥ 0℃ and sunshine duration and the next two are the daily minimum temperature and precipitation.The meteorological factors within a reasonable range promote the increase of the meteorological yields.On the contrary,they will be harmful to the growth and yield formation of maize when exceeding their corresponding threshold values.

Key words: Maize, Growth period, Meteorological factors, Meteorological yield, Change trend, Mann-Kendall test