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Assessing crop water stress of winter wheat by thermography under different irrigation regimes in North China Plain

International Journal of Agricultural and Biological Engineering 2012年第3期5卷 24-34页

作者： Shamaila Zia Du Wenyong Wolfram Spreer klaus spohrer He Xiongkui Joachim Müller Institute of Agricultural Engineering in the Tropics and Subtropics(440e) Universität HohenheimStuttgartGermany College of Science Centre for Chemicals Application TechnologyChina Agricultural UniversityBeijing 100083China

Thermal imaging can be used as an indicator of water stress due to the closure of stomatal *** this paper,we analyzed the robustness and sensitivity of thermography of winter wheat in the North China *** seasonal and diurnal variations of Crop Water Stress Index(CWSI)were *** treatments were applied by means of irrigation,with plots receiving 100%of ETo(DI),50%(D50),16%(D16)and no irrigation(NI).A high correlation was found between stomatal conductance(gs)and CWSI,depending on the phenological stage of the crop with R2=0.44 at pre-heading stage and R2=0.77 at post-heading *** addition,a high correlation between yield and CWSI at different growth stages indicates that thermography can predict *** measurements of canopy temperature were taken to study the effect of the time of day on image acquisition and it was found that midday was the most appropriate *** results should assist in designing precision irrigation scheduling for setting the threshold values.

关键词： CWSI Triticum aestivum L. stomatal conductance canopy temperature yield

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Non-invasive water status detection in grapevine(Vitis vinifera L.)by thermography

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International Journal of Agricultural and Biological Engineering 2009年第4期2卷 46-54页

作者： Shamaila Zia klaus spohrer Nikolaus Merkt Du Wenyong Xiongkui He Joachim Müller Institute of Agricultural Engineering Universität HohenheimStuttgartGermany Institute for Special Crop Cultivation and Crop Physiology Universität HohenheimStuttgartGermany Centre for Chemicals Application Technology(CCAT) China Agricultural UniversityBeijing 100083China

Grapevines are preferentially grown under mild to moderate water stress conditions to achieve the best compromise between wine quality and *** status detection for advanced irrigation scheduling is frequently done by predawn leaf water potential(ΨPD)or leaf stomata conductance(gL)***,these measurements are time and labor ***,the use of infrared thermography(IRT)opens up the possibility to study large population of leaves and to give an overview on the stomatal variation and their *** the present study IRT was used to identify water stress of potted *** order to define the sensitivity of IRT measurements to water stress,the IRT-based water status information were compared with simultaneously measuredΨPD and gL *** between IRT-based CWSI data on the one hand and gL andΨPD on the other showed the potential of IRT for water stress ***,the CWSI calculation procedure is laborious and the sensitivity of CWSI for water stress detection still needs to be ***,further improvements are necessary in order to apply remote IRT-based systems for irrigation scheduling in the field.

关键词： infrared thermography leaf temperature stomata conductance leaf water potential plant water stress and crop water stress index(CWSI)

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