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| DOI：10.13522/j.cnki.ggps.2022545 |
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| Optimizing Wheat Planting Pattern to Balance Wheat Production and Its Water Consumption |
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REN Pinpin, LI Baoguo, HUANG Feng
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1. College of Land Science and Technology, China Agricultural University, Beijing 100193, China;
2. Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture and Rural Affairs, Beijing 100193, China;
3. Key Laboratory of Agricultural Land Quality, Ministry of Natural Resources, Beijing 100193, China
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| Abstract: |
| 【Objective】 Wheat is the most important crop in North China. However, the scarcity of freshwater resources in this region cannot sustain its production. Optimizing wheat planting area to balance wheat production and its water requirement is hence essential to conserving irrigation water and alleviating water shortage pressure .【Method】Evapotranspiration and wheat yield were used as indicators to establish the objective of the wheat planting areas at county scale in the region. Optimization for wheat production was established from the trade-off between wheat production and its water consumption.【Result】From 2001 to 2009, evapotranspiration in the wheat season exhibited an increasing trend, followed by a significant decrease from 2010 to 2018 (p<0.05). Moreover, evapotranspiration in the wheat season showed significant variation among different hydrological years, characterized by the highest level in dry years, followed by normal years, and the lowest level was in wet years. Under current irrigation levels, keeping wheat production weight and evapotranspiration weight both at 1 can increase wheat yield by 1.2% to 2.3% and reduce evapotranspiration by 0.4% to 0.8% across the province. Similar results were also obtained at municipal scale, with the yield increasing by 0.7% to 1.6% and evapotranspiration reduced by 0.3% to 0.5%, under the same production and evapotranspiration level. It was found that under the same irrigation levels, reducing production weight combined with an increase in evapotranspiration weight shifts the regions that can maintain high wheat production from the south to the north in Hebei province. This reflects the variations in wheat production and its water consumption between different counties.【Conclusion】Under current irrigation level or imposing constraint to irrigation, optimizing wheat planting area at county scale in North China can increase yield and reduce evapotranspiration. Our results provide valuable insights into optimization of wheat planting patterns to balance the trade-off between wheat production and water consumption. |
| Key words: wheat planting; regional optimization; trade-off between production and water consumption; irrigation constraint |
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