甘肃黄土高原地温与冬小麦发育期的关系分析

Analysis of Relations Between Soil Temperature and Winter Wheat Growth Period in Gansu Loess Plateau

用黄土高原代表站甘肃省庆阳西峰站1971~2005年5、10、15、20 cm地温和1981~2005年冬小麦发育期资料,分析了地温的时间变化规律及对冬小麦发育期的影响。结果表明,西峰10 cm地温除夏季外,其余季节呈持续升高的趋势。地温与冬小麦发育期成负相关,与冬季地温相关最显著的是乳熟期,相关系数为-0.57^-0.65,与春季地温相关最显著的是返青期,相关系数为-0.60^-0.63。冬季典型年份各平均发育期差异最显著的是冬小麦的起身期提前了15 d,春季典型年份最显著的是冬小麦的全生育期提前了23 d。

Based on the data of 5,10,15,20 cm soil temperature during the period of 1971 -2005 and observations of winter wheat growing stages from 1981 to 2005 in Gansu loss plateau, the temporal change of soil temperature and its impact on winter wheat growth period were analyzed. The results show that the 10 cm soil temperature presented increasing trend in winter, spring and autumn. There was negative relation between soil temperature and growing stages of winter wheat, and in winter the milk stage of winter wheat was obvious related with the correlation coefficient of -0.57 ～ -0.65, and in spring the green stage was the most significant related with the correlation coefficient of - 0.60～ - 0.63.