关键词: 甘肃黄土高原, 10℃气温初日, 分布特征, 冬小麦, 生育期

Abstract: Based on the data of beginning date of 10 ℃ from 1971 to 2004 at 39 meteorological stations in the Loess Plateau of Gansu Province and data of the growing periods of winter wheat in Xifeng Agricultural Meteorological Station,The influence of beginning date of 10 ℃on growing stages of winter wheat in Loess Plateau of Gansu Province was analyzed.The results showed that there were 3 regions in which the 10 ℃ beginning date was earlier located in Beidao,Lanzhou and Jingchuan,while there were 3 regions with later beginning date of 10 ℃ located in Huajialing,Dongxiang and Min County.The general trend showed that the beginning date of average daily temperature over 10 ℃ became earlier,in particular in the 1990's.The average growing period of winter wheat was 3 days earlier generally,while the earing and flowering stage was 11 to 12 days earlier.The whole growing period of winter wheat was 11 days earlier.

Key words: Loess Plateau of Gansu Province, Loess Plateau of Gansu Province, Beginning date of 10 ℃, Distribution character, Winter wheat, Growing period