| Water\|yield relationship and its impact on yield of spring wheat in semi\|arid area |
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| DOI：10.7606/j.issn.1000-7601.2023.06.22 |
| Key Words: spring wheat soil water content yield precipitation water use |
| Author Name | Affiliation | | ZHAO Funian | Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province, Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou，Gansu 730020, China | | LIU Jiang | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Qiang | Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province, Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou，Gansu 730020, China | | WANG Runyuan | Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province, Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou，Gansu 730020, China | | WANG Heling | Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province, Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou，Gansu 730020, China | | LEI Jun | Dingxi Meteorological Bureau, Dingxi， Gansu 743000, China |
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| Abstract: |
| Water availability is the most important environmental factor influencing the growth, development, and yield formation of semi\|arid rain\|fed crops. This study collected long\|term observation data and literature data to analyze the relationship between spring wheat yield and water availability, as well as the environmental factors affecting it. The study aimed to reveal the characteristics and regulatory mechanisms of water limitation in spring wheat under different environmental conditions. The research results showed that under conventional management levels in the semi\|arid region, the relationship between rain\|fed spring wheat yield and water availability was relatively stable. However, pre\|sowing soil water storage affected the relationship between precipitation during the growing season and spring wheat yield. Under different pre\|sowing soil water storage conditions, for each additional 1 mm of precipitation, the increase in spring wheat yield was 21.3 kg·hm-2 and 16.8 kg·hm-2, respectively. At the same time, the atmospheric moisture conditions during the growing season (difference between potential evaporation and precipitation) also affected the relationship between pre\|sowing soil water storage and spring wheat yield. When the atmosphere was relatively dry (difference between potential evaporation and precipitation exceeds 425 mm), the slope of the relationship between yield and soil water content was 22.9 kg·hm-2·mm-1. When the atmosphere was relatively humid (difference between potential evaporation and precipitation is less than 425 mm), the slope was 20.1 kg·hm-2·mm-1. Compared to precipitation during the growing season, pre\|sowing soil water storage played a more decisive role in spring wheat yield. The climatic year type of semi\|arid rain\|fed spring wheat in the region was jointly determined by pre\|sowing soil water storage and atmospheric moisture conditions during the growing season. Increasing pre\|sowing soil water storage and irrigation at specific stages of the growing season could alter the relationship between wheat water consumption and yield, ultimately affecting water use efficiency. Both atmospheric moisture conditions and irrigation conditions contributed to the regional differences in the boundary function of spring wheat in northwest China. |
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