Journal of Remote Sensing Technology
Journal of Remote Sensing Technology(JRST)
Frequency: Annually
Finding the Spectral Signature of 15Nitrogen Isotopes in Plants by Hyperspectral Techniques
Expensive laboratory based instrumentation is typically used to perform stable isotope analysis, making sample run times lengthy and costly. Research was conducted to identify novel approaches to stable isotope analysis using infrared spectroscopy techniques in both laboratory and field based instrumentation. Buckwheat plants were grown in aeroponic conditions at three nitrogen concentration levels (0.32%, 0.20%, and 0.10%) of 95% 15N-labelled fertilizer solutions and compared to a control with natural abundance (0.0036%) nitrogen based fertilizer. Infrared instrumentation was used to measure the buckwheat leaves and show diagnostic wavelength shifts are correlated to their fertilizer concentration, occur at multiple infrared frequencies, and are associated with nitrogen functional group compounds present in the buckwheat. These measurements confirm that with remote sensing techniques, nitrogen isotopes are detectible in the infrared region. The ability to remotely sense nitrogen isotopes with either field or airborne sensors will enable faster analysis and wider spatial coverage than current techniques.
Keywords:Stable Isotopes; FTIR; Infrared Spectroscopy; Nitrogen
Author: Sonja K. Capelle,Stephen A. Macko


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