关键词: 冬小麦, 需水量, 气象因素, 关联性分析, 山西省

Abstract: To provide scientific guidance for winter wheat irrigation, the inter-annual variations of water requirement, water deficit and water profit and loss index of winter wheat in Shanxi Province were comprehensively analyzed, and the correlation between water requirement of winter wheat and various meteorological factors in Shanxi Province was analyzed by the improved grey correlation analysis method. The results showed that from 1973 to 2020, the water requirement for winter wheat in Shanxi Province was 460.25~600.76 mm, the water deficit was 247.59~493.41 mm, and the water profit and loss index was 0.53~0.89. The maximum air temperature, water surface evaporation and sunshine duration ranked the top three in the correlation with winter wheat water demand in the central region, with correlation degrees of 0.907, 0.874 and 0.861, respectively. The maximum air temperature, sunshine duration and wind speed ranked the top three in the correlation with winter wheat water demand in the southern region, with correlation degrees of 0.889, 0.873 and 0.864, respectively. The water surface evaporation, precipitation and sunshine duration ranked the top three in the correlation with winter wheat water demand across the entire region, with correlation degrees of 0.892, 0.887 and 0.851, respectively. These three factors had the most significant impact on the water demand of winter wheat.

Key words: winter wheat, water requirement, meteorological factors, correlation analysis, Shanxi Province