The biophysical and crop yield effects of irrigation and their changes in China’s drylands

IF 5.9 1区农林科学 Q1 AGRONOMY

Agricultural Water Management Pub Date : 2025-04-16 DOI:10.1016/j.agwat.2025.109471

Shuangshuang Zi , Yan Li , Jingwen Zhang , Chengcheng Hou , Huiqing Lin , Zhengjie Xu , Shan Sang , Jinwei Dong , Bojie Fu

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引用次数: 0

Abstract

Irrigation is critical for food production, especially in arid and semi-arid regions, and it has complex and interactive effects on local climate, evapotranspiration, and crop growth. Here, we used satellite remote sensing data and statistical models to quantify the biophysical effects of irrigation on land surface temperature (LST), evapotranspiration (ET), crop greenness, and crop yield effects and their spatiotemporal changes in China’s drylands. Results show that during 2001–2012, irrigation in China's drylands led to a significant cooling in daytime LST (-0.52 °C), a weak cooling in nighttime LST (-0.14 °C), and increases in ET (+0.16 mm/d), crop greenness (+0.02) and maize yields (+3.4 ton/ha; 55 %) compared with rainfed croplands. The spatial variations of these irrigation effects were in synergy, driven by irrigation water use and climate conditions, with greater effects in the dry regions with higher irrigation intensity. Temporally, the irrigation cooling effects gradually weakened from 2001 to 2020 (0.08 °C), while the enhanced effects on ET (+0.062 mm/d), crop greenness (+0.006) and maize yields (+720 kg/ha) were still increasing. These divergent changes were mainly driven by declined irrigation water use and increased irrigation water productivity due to adopting water-saving irrigation technologies. This study improves our understanding of the irrigation effects and their responses to changing irrigation practices and climate in water-limited regions.

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中国旱地灌溉的生物物理效应和作物产量效应及其变化

灌溉对粮食生产至关重要，特别是在干旱和半干旱地区，它对当地气候、蒸散和作物生长具有复杂的相互作用。利用卫星遥感数据和统计模型，定量分析了灌溉对中国旱地地表温度、蒸散发、作物绿度和作物产量的生物物理效应及其时空变化。结果表明：2001-2012年，中国旱地灌溉导致地表温度白天显著降温（-0.52°C），夜间微弱降温（-0.14°C）， ET（+0.16 mm/d）、作物绿度（+0.02）和玉米产量（+3.4 t /ha）增加；55 %)与旱作农田相比。在灌溉用水和气候条件的共同作用下，各灌溉效应的空间变化具有协同效应，且在灌溉强度越高的干旱地区影响越大。从时间上看，2001 ~ 2020年（0.08°C）灌溉降温效应逐渐减弱，但对蒸散发（+0.062 mm/d）、作物绿度（+0.006）和玉米产量（+720 kg/ha）的降温效应仍在增强。这些差异变化主要是由于节水灌溉技术的采用导致灌溉用水减少和灌溉用水生产力的提高。本研究提高了我们对水资源有限地区灌溉效应及其对灌溉方式和气候变化的响应的认识。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.