Dielectric Response of Corn Leaves to Water Stress

Tim Van Emmerik; Susan C. Steele-Dunne; Jasmeet Judge; Nick Van De Giesen

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Dielectric Response of Corn Leaves to Water Stress

机译：玉米叶片对水分胁迫的介电响应

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Radar backscatter from a vegetated surface is sensitive to direct backscatter from the canopy and two-way attenuation of the signal as it travels through the canopy. Both mechanisms are affected by the dielectric properties of the individual elements of the canopy, which are primarily a function of water content. Leaf water content of corn can change considerably during the day and in response to water stress, and model simulations suggested that this significantly affects radar backscatter. Understanding the influence of water stress on leaf dielectric properties will give insight into how the plant water status changes in response to water stress and how radar can be used to detect vegetation water stress. We used a microstrip line resonator to monitor the changes in its resonant frequency at corn leaves, due to variations in dielectric properties. This letter presents the in vivo resonant frequency measurements during field experiments with and without water stress, to understand the dielectric response due to stress. The resonant frequency of the leaf around the main leaf of the stressed plant showed increasing diurnal differences. The dielectric response of the unstressed plant remained stable. This letter shows the clear statistically significant effect of water stress on variations in resonant frequency at individual leaves.

机译：来自植被表面的雷达后向散射对来自天篷的直接后向散射以及信号在穿过天篷时的双向衰减很敏感。两种机制都受冠层各个元素介电特性的影响，介电特性主要是水含量的函数。玉米叶片中的水分在白天和水分胁迫下会发生很大变化，模型仿真表明这会严重影响雷达的反向散射。了解水分胁迫对叶片介电特性的影响，将使您深入了解植物水分状况如何响应水分胁迫而发生变化，以及如何使用雷达检测植被水分胁迫。由于介电特性的变化，我们使用了微带线谐振器来监测其在玉米叶片上的谐振频率的变化。这封信介绍了在有水应力和无水应力的野外实验过程中的体内共振频率测量，以了解应力引起的介电响应。胁迫植物的主要叶片周围叶片的共振频率显示出日间差异的增加。无应力植物的介电响应保持稳定。这封信显示了水分胁迫对各个叶片共振频率变化的明显统计学显着影响。

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来源
《IEEE Geoscience and Remote Sensing Letters》 |2017年第1期|8-12|共5页
作者
Tim Van Emmerik; Susan C. Steele-Dunne; Jasmeet Judge; Nick Van De Giesen;
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作者单位

Water Resources Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands;

Water Resources Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands;

Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, USA;

Water Resources Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands;

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正文语种 eng
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关键词
Stress; Dielectric measurement; Radar; Resonant frequency; Backscatter; Dielectric constant;

机译：应力;介电测量;雷达;谐振频率;反向散射;介电常数;

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5. RELATIONSHIP BETWEEN THE CHEMICAL COMPOSITION OF CORN LEAVES AND YIELD RESPONSES FROM NITROGEN AND PHOSPHORUS FERTILIZER. [D] . DUMENIL, LLOYD CARVER. 1958

机译：氮和磷肥中玉米叶片化学成分与产量的关系。
6. The Response of The Young Tomato Plant to a Brief Period of Water Shortage. IV. Effects of Water Stress on the Ribonucleic Acid Metabolism of Tomato Leaves. [O] . C. T. Gates, James Bonner 2012

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7. Dielectric Response of Corn Leaves to Water Stress [O] . van Emmerik, T.H.M., Steele-Dunne, S.C., Judge, J, 2016

机译：玉米叶片对水分胁迫的介电响应

Dielectric Response of Corn Leaves to Water Stress

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