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New pathways and the associated uncertainties for increasing maize water use efficiency under global warming
Archives of Agronomy and Soil Science ( IF 2.3 ) Pub Date : 2020-12-28 , DOI: 10.1080/03650340.2020.1864340
Mahdi Kalanaki 1, 2 , Fatemeh Karandish 1, 3 , Henk Ritzema 2 , Moosa Kalanaki 4
Affiliation  

ABSTRACT

The DSSAT4.7-CERES model was employed to simulate plant-water nexus conditions in the future of Mazandaran province in Iran, using ensemble outputs of various GCMs and emission scenarios with LARS-WG 5.5 in the time period 2010–2100. The results showed during the 21st century, maize water requirement is expected to be reduced by 3.3–14.1%. Under climate change scenarios, both negative and positive changes in crop yield are projected, between −37.4 and 36.1%, which consequently results in a 5.1–27.2% reduction in water use efficiency (WUE) in the future periods. Deficit irrigation (DI) with 25% reduction in irrigation water depth (DI75) lead to a moderate reduction of 4.3–5.5% in WUE, but WUE was highly reduced under DI55. While early planting may reduce WUEs by 0.4–17%, late planting almost resulted in improved WUE, especially under DI75. Less frequent irrigation significantly reduces actual evapotranspiration, which consequently resulted in improved WUE by 0.57– 42.47%. In conclusion, the integrated assessment reveals that DI75, with an irrigation interval of 5 days, together with a 20 days delay in cropping date of maize in Mazandaran province, may be considered as an effective adaptation solution, when considering both food and water security.



中文翻译:

全球变暖下提高玉米用水效率的新途径和相关不确定性

摘要

DSSAT4.7-CERES 模型用于模拟伊朗马赞达兰省未来的植物-水关系条件,使用各种 GCM 的集合输出和 LARS-WG 5.5 在 2010-2100 年期间的排放情景。结果显示,21世纪玉米需水量预计将减少3.3-14.1%。在气候变化情景下,预计作物产量会出现负和正变化,介于 -37.4% 和 36.1% 之间,因此导致未来期间用水效率 (WUE) 降低 5.1% 至 27.2%。灌溉水深 (DI 75 ) 减少 25% 的亏缺灌溉 (DI) 导致 WUE 适度减少 4.3-5.5%,但在 DI 55下 WUE 大大减少. 虽然早期种植可以将 WUE 降低 0.4-17%,但后期种植几乎可以改善 WUE,尤其是在 DI 75下。减少灌溉频率会显着降低实际蒸散量,从而将 WUE 提高 0.57-42.47%。总之,综合评估表明,在考虑粮食和水安全时,DI 75(灌溉间隔为 5 天,加上马赞达兰省玉米种植日期延迟 20 天)可被视为有效的适应解决方案.

更新日期:2020-12-28
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