High temperature and accompanying high vapor pressure deficit often stress plants without causing distinctive changes in plant canopy structure and consequential spectral signatures. Sun-induced chlorophyll fluorescence (SIF), because of its mechanistic link with photosynthesis, may better detect such stress than remote sensing techniques relying on spectral reflectance signatures of canopy structural changes. However, our understanding about physiological mechanisms of SIF and its unique potential for physiological stress detection remains less clear. In this study, we measured SIF at a high-temperature experiment, Temperature Free-Air Controlled Enhancement, to explore the potential of SIF for physiological investigations. The experiment provided a gradient of soybean canopy temperature with 1.5, 3.0, 4.5, and 6.0°C above the ambient canopy temperature in the open field environments. SIF yield, which is normalized by incident radiation and the fraction of absorbed photosynthetically active radiation, showed a high correlation with photosynthetic light use efficiency (r = 0.89) and captured dynamic plant responses to high-temperature conditions. SIF yield was affected by canopy structural and plant physiological changes associated with high-temperature stress (partial correlation r = 0.60 and -0.23). Near-infrared reflectance of vegetation, only affected by canopy structural changes, was used to minimize the canopy structural impact on SIF yield and to retrieve physiological SIF yield (Φ ) signals. Φ further excludes the canopy structural impact than SIF yield and indicates plant physiological variability, and we found that Φ outperformed SIF yield in responding to physiological stress (r = -0.37). Our findings highlight that Φ sensitively responded to the physiological downregulation of soybean gross primary productivity under high temperature. Φ , if reliably derived from satellite SIF, can support monitoring regional crop growth and different ecosystems' vegetation productivity under environmental stress and climate change.
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http://dx.doi.org/10.1111/gcb.15603 | DOI Listing |
Front Plant Sci
December 2024
School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, China.
Introduction: In the context of climate variability, rapid and accurate estimation of winter wheat yield is essential for agricultural policymaking and food security. With advancements in remote sensing technology and deep learning, methods utilizing remotely sensed data are increasingly being employed for large-scale crop growth monitoring and yield estimation.
Methods: Solar-induced chlorophyll fluorescence (SIF) is a new remote sensing metric that is closely linked to crop photosynthesis and has been applied to crop growth and drought monitoring.
PLoS One
December 2024
School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing, Heilongjiang, China.
The proposed work aims to demonstrate the significance of the plastic zone at the tip of an axial crack in a pipeline for managing Stress IntensityFactors(SIF). The three-dimensional finite element model of pressure pipeline with axial cracks was built by utilizing the Ramberg-Osgood X80 material model of pipeline. according to Von Mises yield criterion, the size of plastic zone at crack tip was determined, and the fracture parameters were calculated based on interaction integral method, the plastic stress deformation law, determination of elastic-plastic limit load and plastic correction of SIF at crack tip of pressure pipeline with axial crack were discussed.
View Article and Find Full Text PDFJ Anim Sci
January 2024
Institute of Dairy Science, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China.
Soybean isoflavone (SIF) in soybeans are natural phytoestrogens, which is functioned as an estrogen agonistic or antagonistic. SIF regulates the capacity of animals to synthesize triacylglycerols by directly utilizing long-chain fatty acids. However, few studies have focused on its regulatory lipid metabolism in lactating dairy goats.
View Article and Find Full Text PDFChemosphere
November 2024
Department of Chemical Engineering and Materials Science/Environmental Technology Research Center, Yuan Ze University, Taoyuan City, 32003, Taiwan.
Per(fluorinated) compounds (PFCs/FCs) are a class of synthetic chemicals that are widely used in various industrial applications because of their unique properties. However, in recent years, their abundance in the environment has resulted in serious adverse effects on human health, raising crucial concerns in the environmental field. In this study, zeolites (Beta, Y, and ZSM-5) were used as catalysts for the decomposition and adsorption of PFCs/FCs (CF, SF, NF, CF, and CF) by varying the temperature, pH, and contact time.
View Article and Find Full Text PDFMemory
October 2024
Clinical Psychology, University of Amsterdam, Amsterdam, The Netherlands.
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