Instruments and methods of measurement laser method for vegetation monitoring

The paper considers a laser fluorescence method for vegetation monitoring. It presents the results of an experimental study of plants’ laser-induced fluorescence spectra under various stress conditions caused by the presence of soil pollutants, excess water or mechanical damages. At the fluorescence excitation wavelength of 532 nm, the impact of different stress factors proves to manifest itself in both increasing the laser-induced fluorescence intensity and changing the form of the fluorescence spectrum, according to stress types and various vegetation types. Fluorescence intensities ratio at two wavelengths of 680 and 740 nm can be regarded as an identifying factor characterizing the form change of the laser-induced fluorescence spectrum. Measurement of both the intensity and spectrum form of plants’ laser-induced fluorescence can be the basis of the laser method for detecting plants’ stress conditions.

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