| Impact of climate change on irrigated spring wheat growth in Hexi Corridor |
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| DOI：10.7606/j.issn.1000-7601.2021.01.27 |
| Key Words: Hexi Corridor climate changes temperature spring wheat growth |
| Author Name | Affiliation | | YANG Hua | Key Laboratory of Arid Climate Change and Disaster Reducing of China Meteorological Administration/Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Institute of Arid Meteorology. China Meteorological Administration, Lanzhou, Gansu 730020, China
Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | DING Wenkui | Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | WANG Heling | Key Laboratory of Arid Climate Change and Disaster Reducing of China Meteorological Administration/Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Institute of Arid Meteorology. China Meteorological Administration, Lanzhou, Gansu 730020, China | | JIANG Jufang | Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China |
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| Abstract: |
| In this paper, the observation data of irrigated spring wheat from Desert Ecology and Agrometeorological Experimental Station in Wuwei of Gansu Province from 1981 to 2019 were used, and the effect of climate change on spring wheat growth in irrigated agricultural area of Hexi Corridor was preliminarily discussed to provide scientific basis for the agricultural planting structure, variety adjustment, saving water and improving the capacity of coping with climate change and prevention and reduction disaster under the background of climate warming. Linear regression analysis, correlation analysis, and cubic function were used to reveal the influence of climate change on the growth of irrigated spring wheat in recent 39 years. The results showed that the climate change in the region displayed a warm and humid trend from 1951 to 2019, the temperature changed at a rate of 0.326 ℃·10a-1, the precipitation changed at a rate of 5.694 ℃·10a-1. The response of irrigated spring wheat to climate change was as follows: the growth stage of spring was delayed by 0~1 d·10a-1, the growth stage of summer was advanced by 1~2 d·10a-1, the growth stage was shortened by 2~3 d·10a-1, and the yield was increased by 500~550 kg·hm-2·10a-1. The correlation analysis revealed that the impact of temperature on irrigated spring wheat was higher than precipitation did, the sunlight length and active accumulated temperature greater than or equal to 0℃. In the whole growth stage of irrigated spring wheat, the response of growth stage and yield to climate change were not completely consistent. That is to say it prolonged the nutrition growth stage from sowing to three leaf stage, shortened the reproductive growth stage from jointing to maturing, and resulted in the shortening of the whole growth period. The increase of temperature at jointing to earring stage had a highly positive effect on the yield of irrigated spring wheat (correlation coefficient R=0.431). The increase of temperature at sowing to maturing stage had a significant positive effect on the yield of irrigated spring wheat (correlation coefficient R=0.354). Climate warming and humidification increase thermal resources and improve the crop yield potential in Hexi Corridor, but also aggravate disease and pest and increase the difficulty of prevention and control. The growth changes of irrigated spring wheat are the common results of crop response to climate change and agricultural production adapting to climate change in this area. |
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