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首页> 外文期刊>Journal of Experimental Botany >Use of thermal and visible imagery for estimating crop water status of irrigated grapevine*
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Use of thermal and visible imagery for estimating crop water status of irrigated grapevine*

机译：利用热图像和可见光图像估算灌溉葡萄的作物水分状况*

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摘要

Achieving high quality wine grapes depends on the ability to maintain mild to moderate levels of water stress in the crop during the growing season. This study investigates the use of thermal imaging for monitoring water stress. Experiments were conducted on a wine-grape (Vitis vinifera cv. Merlot) vineyard in northern Israel. Irrigation treatments included mild, moderate, and severe stress. Thermal and visible (RGB) images of the crop were taken on four days at midday with a FLIR thermal imaging system and a digital camera, respectively, both mounted on a truck-crane 15 m above the canopy. Aluminium crosses were used to match visible and thermal images in post-processing and an artificial wet surface was used to estimate the reference wet temperature (Twet). Monitored crop parameters included stem water potential (Ψstem), leaf conductance (gL), and leaf area index (LAI). Meteorological parameters were measured at 2 m height. CWSI was highly correlated with gL and moderately correlated with Ψstem. The CWSI-gL relationship was very stable throughout the season, but for that of CWSI-Ψstem both intercept and slope varied considerably. The latter presumably reflects the non-direct nature of the physiological relationship between CWSI and Ψstem. The highest R2 for the CWSI to gL relationship, 0.91 (n=12), was obtained when CWSI was computed using temperatures from the centre of the canopy, Twet from the artificial wet surface, and reference dry temperature from air temperature plus 5 °C. Using Twet calculated from the inverted Penman–Monteith equation and estimated from an artificially wetted part of the canopy also yielded crop water-stress estimates highly correlated with gL (R2=0.89 and 0.82, respectively), while a crop water-stress index using ‘theoretical’ reference temperatures computed from climate data showed significant deviations in the late season. Parameter variability and robustness of the different CWSI estimates are discussed. Future research should aim at developing thermal imaging into an irrigation scheduling tool applicable to different crops.
机译：要获得高质量的酿酒葡萄，取决于能否在生长季节保持作物中轻度到中度的水分胁迫水平。这项研究调查了使用热成像监测水压力。实验是在以色列北部的葡萄酿酒葡萄园（Vitis vinifera cv。Merlot）上进行的。灌溉处理包括轻度，中度和重度压力。使用FLIR热成像系统和数码相机分别在中午四天拍摄了作物的热图像（RGB）和可见图像（RGB），两者均安装在树冠上方15 m的卡车起重机上。在后处理中，使用铝十字来匹配可见图像和热图像，并使用人造湿表面来估计参考湿温度（T wet ）。监测的作物参数包括茎水势（Ψ stem ），叶片电导（g L ）和叶面积指数（LAI）。在2 m高处测量气象参数。 CWSI与g L 高度相关，与Ψ Stem 中等相关。在整个季节中，CWSI-g L 关系非常稳定，但对于CWSI-Ψ Stem ，其截距和斜率变化很大。后者大概反映了CWSI与Ψ stem 之间的生理关系的非直接性质。 CWSI与g L 的关系的最高R 2 为0.91（n = 12），这是通过使用冠层中心温度T we 从人造湿表面，参考干燥温度从空气温度加上5°C。使用根据反向Penman–Monteith方程计算并根据人工湿润的冠层部分估算的T wet ，也得出了与g L （R < sup> 2 = 0.89和0.82），而使用根据气候数据计算出的“理论”参考温度得出的作物水分胁迫指数则在后期明显偏离。讨论了不同CWSI估计的参数可变性和鲁棒性。未来的研究应致力于将热成像技术发展成适用于不同农作物的灌溉计划工具。

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  • 来源
    《Journal of Experimental Botany》 |2007年第4期|827-838|共12页
  • 作者

    M M?ller1? V Alchanatis2 Y Cohen2 M Meron3 J Tsipris3 A Naor4 V Ostrovsky2 M Sprintsin5 and S Cohen1;

  • 作者单位

    Institute of Soil Water and Environmental Sciences Agricultural Research Organization (ARO) The Volcani Center PO Box 6 50250 Bet Dagan Israel;

    Institute of Agricultural Engineering Agricultural Research Organization (ARO) The Volcani Center PO Box 6 50250 Bet Dagan Israel;

    Crop Ecology Laboratory Migal PO Box 831 11016 Kiryat Shmona Israel;

    Golan Research Institute PO Box 97 12900 Katzrin Israel;

    The J Blaustein Institute for Desert Research Ben-Gurion University of the Negev Sede-Boker Campus 84990 Israel;

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