Study on hierarchical regulation of crop irrigation threshold under severe drought conditions

IF 5.9 1区 农林科学 Q1 AGRONOMY Agricultural Water Management Pub Date : 2024-12-14 DOI:10.1016/j.agwat.2024.109239
Ruidan Gu, Huaxiang He, He Chen, Jiake Tian
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Abstract

The increased frequency of severe drought events has increased the global water supply security risks, posing a substantial threat to food crop yields such as rice. Therefore, it is crucial to accurately regulate rice irrigation thresholds and optimize the coordination between rice irrigation and the water demand of other industries under severe drought conditions. This study employed the WOFOST model to simulate rice yield in Chuxiong Yi Autonomous Prefecture, Yunnan Province, under various irrigation scenarios, focusing on severe drought conditions. Optimal irrigation schemes and corresponding irrigation thresholds were determined for different yield reduction rates during 90 % and 95 % extremely dry years, utilizing predefined rates of irrigation contribution, yield reduction, and water productivity. The results are as follows. (1) During extremely dry years, irrigation during the jointing-booting, heading-flowering stages can boost the yield by up to 218 % and 270 % compared to the yield without irrigation, respectively. Based on irrigation water productivity, it can be advisable to avoid reducing irrigation during the jointing-booting stage and heading-flowering stage. (2) The irrigation threshold varied according to the severity of drought. (3) During three consecutive years of severe drought, rice yield exhibited an annual decreasing trend, aiming to minimize comprehensive economic losses and optimize water utilization efficiently. This study can provide decision support for the hierarchical regulation of crop irrigation thresholds under severe drought conditions.
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严重干旱事件日益频繁,增加了全球供水安全风险,对水稻等粮食作物的产量构成了巨大威胁。因此,在严重干旱条件下,准确调节水稻灌溉阈值,优化水稻灌溉与其他产业需水之间的协调至关重要。本研究利用 WOFOST 模型模拟了云南省楚雄彝族自治州在各种灌溉情景下的水稻产量,重点关注严重干旱条件下的水稻产量。利用预先设定的灌溉贡献率、减产率和水分生产率,确定了 90% 和 95% 极旱年份不同减产率下的最佳灌溉方案和相应的灌溉阈值。结果如下(1) 在极端干旱年份,与不灌溉的产量相比,在拔节期、抽穗期和开花期灌溉可分别增产 218% 和 270%。根据灌溉水生产率,可以建议避免在拔节期和头花期减少灌溉。(2)灌溉阈值随干旱严重程度而变化。(3)在连续三年大旱期间,水稻产量呈逐年下降趋势,旨在最大限度地减少综合经济损失,有效优化水资源利用。该研究可为严重干旱条件下作物灌溉阈值的分级调控提供决策支持。
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来源期刊
Agricultural Water Management
Agricultural Water Management 农林科学-农艺学
CiteScore
12.10
自引率
14.90%
发文量
648
审稿时长
4.9 months
期刊介绍: Agricultural Water Management publishes papers of international significance relating to the science, economics, and policy of agricultural water management. In all cases, manuscripts must address implications and provide insight regarding agricultural water management.
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