Abstract:

Based on temperature，rainfall and sunshine hours data during spring wheat growth period ( March to June) from 78 stations of Gansu Province in recent 45 years，the spatial and temporal evolution and climate response of spring wheat yield were analyzed by means of REOF and wavelets analysis． The results are as follows: ( 1) The spring wheat yield decreased from west to east and north to south region in Gansu Province; ( 2) There was two special regions for spring wheat，in east region of Gansu Province，the spring wheat yield was obviously lower and unstable， especially for the loess plateau region of the middle Gansu，while in west region of Gansu Province，the spring wheat yield was higher and stable． And when higher yield appeared in Hexi Corridor，the lower yield appeared in east region of Gansu Province and vice versa; ( 3) The spring wheat yield was sensitive to temperature change in Hexi Corridor，but in the loess plateau region，it was sensitive to precipitation; ( 4) The spring wheat yield amplitude was smaller before 1991 in the most sensitive area and then increased，and the abundant and shortfall years alternated with two to three years period．

Key words: Gansu, spring wheat yield, spatial － temporal characteristic, climate warming, response

摘要：

利用近４５ ａ 甘肃省７８ 县区春小麦实际产量生长期（３ ～ ６ 月）气温、降水和日照时数等资料，主要采用ＲＥＯＦ 和小波分析等方法，分析春小麦产量时空演变及气候响应。结果表明：１）甘肃春小麦产量由西向东、由北到南产量递减；２）存在河东、河西２ 个特别区域，春小麦在河西走廊地区高产而稳定，河东地区明显产量低且不稳定，陇中黄土高原地区最为突出；河西走廊区域产量变化与陇中反向，及河西产量偏高年份河东反而偏低，反之亦然。河东地区相关程度很高，产量变化与河西反向；３）河西走廊地区对气温响应敏感，甘肃黄土高原地区对干湿（降水）的变化敏感；４）响应最敏感区产量１９９１ 年之前变幅较小，之后变幅加大；丰欠年份相间，存在２ ～３ ａ 的准振荡周期。

关键词: 甘肃, 春小麦产量, 时空特征, 气候变暖, 响应