The results of the leaves and needles samples reflection spectra measurements on a laboratory installation in the range of 0.4-2.4 μm during the summer-autumn period are presented. It has been shown that there may be cases when the summer (for green leaves) and autumn (for yellow-green leaves) leaves or needles samples reflection spectra differ slightly in the visible range (0.4-0.75 μm), and in the near-infrared range (1.4-2.4 μm) stronger. It has also been noted that the information index R value (which is equal to the ratio of the vegetation reflectivity in the narrow spectral bands near wavelengths of 1.65 and 2.03 μm) is significantly higher for green vegetation samples (in summer period) compared to yellow or began to turn yellow samples (in autumn period).
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Иванов et al. (2024) studied this question.
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