Proxy detection of wheat water stress from photochemical reflectance index and land surface temperature data

IF 5.6 1区 农林科学 Q1 AGRONOMY
Zoubair Rafi , Valérie Le Dantec , Saïd Khabba , Abdelhakim Amazirh , Patrick Mordelet , El Houssaine Bouras , Salah Er-Raki , Abdelghani Chehbouni , Olivier Merlin
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Abstract

In semi-arid and arid regions, crops face elevated atmospheric demands and endure prolonged periods of moderate to severe water scarcity. In this context, this study investigated the effectiveness of the photochemical reflectance index (PRI) and a normalized surface temperature index (Tnorm) for proxy detection of the water stress of winter wheat crops. Furthermore, the potential of PRI for characterizing water, atmospheric or photo-inhibition stress, and wheat transpiration was assessed over experimental drip-irrigated crop fields in the Haouz plain, central Morocco. In practice, PRI observations were compared to agro-environmental variables such as Leaf Area Index (LAI), Available Water Content (AWC) at a root zone depth, net Radiation (Rn), Vapor Pressure Deficit (VPD) and the wheat transpiration derived from sap flows, lysimeters and a crop water balance model. Due to the strong relationship between PRI and LAI (R2 = 0.91), another index named PRIj was derived to correct for this effect. The PRIj was found to be independent of structural effects related to LAI and significantly correlated with AWC (R2 = 0.85). Using the PRIj index, we can reflect the level of water stress experienced by the wheat field throughout the experiment with an R2 of 0.69 for a FAO-56 water stress coefficient (Ks) of less than 1. Under dry conditions, for an AWC below 30%, the correlation between AWC and Tnorm gives an R2 of 0.29. However, comparison of PRIj with the Tnorm index showed that PRIj is an early water stress index and provides information on the state of the vegetation cover at all stages of wheat development. The study's findings can have a significant impact on the use of the PRI as a water stress indicator, helping in the optimal irrigation of crops.

从光化学反射指数和地表温度数据中代理检测小麦水分胁迫
在半干旱和干旱地区,农作物面临着大气需求量的增加和长期的中度至严重缺水。在这种情况下,本研究调查了光化学反射率指数(PRI)和归一化表面温度指数(Tnorm)在替代检测冬小麦作物水分胁迫方面的有效性。此外,还评估了 PRI 在摩洛哥中部豪兹平原滴灌试验作物田中表征水分、大气或光抑制胁迫以及小麦蒸腾作用的潜力。在实践中,将 PRI 观察结果与农业环境变量(如叶面积指数 (LAI)、根带深度的可用含水量 (AWC)、净辐射 (Rn)、蒸汽压力亏缺 (VPD) 以及从液流、溶液测量仪和作物水分平衡模型得出的小麦蒸腾量)进行了比较。由于 PRI 与 LAI 关系密切(R2 = 0.91),因此得出了另一个名为 PRIj 的指数来校正这一影响。结果发现,PRIj 与 LAI 的结构效应无关,与 AWC 显著相关(R2 = 0.85)。在干旱条件下,当 AWC 低于 30% 时,AWC 与 Tnorm 之间的相关性为 0.29。不过,PRIj 与 Tnorm 指数的比较表明,PRIj 是一种早期水分胁迫指数,可提供小麦生长各阶段植被状况的信息。该研究结果对使用 PRI 作为水分胁迫指标具有重要影响,有助于优化作物灌溉。
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来源期刊
CiteScore
10.30
自引率
9.70%
发文量
415
审稿时长
69 days
期刊介绍: Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.
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