干旱对雨养和灌溉农业造成的压力：来自多源卫星衍生生态指标的见解

IF 5.9 1区农林科学 Q1 AGRONOMY

Agricultural Water Management Pub Date : 2025-02-01 DOI:10.1016/j.agwat.2024.109249

Yanan Chen , Ying Wang , Chaoyang Wu , Alexandre Maniçoba da Rosa Ferraz Jardim , Meihong Fang , Li Yao , Guihua Liu , Qiuyi Xu , Lintao Chen , Xuguang Tang

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引用次数: 0

摘要

由于全球气温上升，干旱的频率和严重程度日益增加，正在影响农作物产量。阐明不同管理做法下农业生态系统对干旱的反应对于粮食安全至关重要，这有助于实现联合国可持续发展目标2中的零饥饿目标。利用3个月的标准降水蒸散指数（SPEI3）回顾了2012年美国大陆破纪录干旱事件的时空演变，并基于3个卫星生态指标，包括结构指标（LAI）和生理指标（GPP、GOSIF），分别分析了干旱对灌溉农田和雨耕地的影响。总体而言，这些指标表现出明显的季节动态特征，较好地反映了2012年干旱对农业的影响。与其他两个指标相比，在雨养农田，LAI对干旱更为敏感。具体而言，2012年干旱期间，旱地LAI在年月日（DOY） 161左右低于多年平均值，而GPP和GOSIF在年月日（DOY） 177左右开始。相比之下，LAI和GPP在169年左右同时捕获了灌溉农田的负异常。与灌溉区相比，2012年6 - 9月旱作区LAI、GPP和GOSIF的累计降幅分别为3.64、12.92 g C m−2和0.55 W m−2 μm−1 sr−1。从空间上看，美国大陆旱地和灌溉农田的负异常在整个生长季节都有所增加。在此期间，灌溉田的负异常百分比低于雨养田。在本研究中，我们说明了灌溉在缓解农业生态系统气象干旱以及为人类粮食供应提供保障方面具有重要作用。

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Drought-induced stress on rainfed and irrigated agriculture: Insights from multi-source satellite-derived ecological indicators

The increasing frequency and severity of droughts, driven by rising global temperatures, are impacting crop yields. Elucidating the response of agricultural ecosystems to droughts under different management practices is vital for food security that supports the United Nations Sustainable Development Goal 2 for zero hunger. Our study revisited the spatio-temporal evolution of record-breaking drought event of 2012 in the continental United States by using a 3-month Standard Precipitation Evapotranspiration Index (SPEI₃), and analyzed the impacts of such drought based on three satellite-based ecological metrics, including structural metric (LAI) and physiological metrics (GPP, GOSIF) across the irrigated and rainfed croplands, respectively. Generally, these metrics exhibited obvious seasonal dynamics, and successfully captured the drought-induced stress on agriculture in 2012. In rainfed croplands, LAI was more sensitive to drought compared to the other two metrics. Specifically, during the 2012 drought, LAI in rainfed fields was below the multi-year average at approximately day of year (DOY) 161, while GPP and GOSIF began at about DOY 177. By contrast, LAI and GPP simultaneously captured the negative anomalies in irrigated croplands at approximately DOY 169. Compared to the irrigated cropland, the rainfed cropland showed larger cumulative decreases in LAI, GPP, and GOSIF from June to September 2012 by about 3.64, 12.92 g C m⁻², and 0.55 W m⁻² μm⁻¹ sr⁻¹, respectively. Spatially, all negative anomalies increased throughout the growing season of both rainfed and irrigated croplands in the continental United States. The percentage of negative anomalies in irrigated fields was lower than in rainfed fields during this period. In this study, we illustrated that irrigation plays an important role in mitigating meteorological droughts in agroecosystems as well as providing safeguards for human food supply.

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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.