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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 7, pp. 78-88

Experimental substantiation of the capabilities of videospectral remote indication of short-term vegetation stress

O.V. Grigorieva 1 , I.V. Drozdova 2 , B.V. Shilin 3 
1 A.F. Mozhaisky Military Space Academy, Saint Petersburg, Russia
2 Komarov Botanical Institute RAS, Saint Petersburg, Russia
3 Scientific-Research Centre for Ecological Safety RAS, Saint Petersburg, Russia
Accepted: 27.10.2018
DOI: 10.21046/2070-7401-2018-15-7-78-88
In the paper, we show the results of a stationary laboratory research on the changes in the spectral reflectance of plants under a short-term exposure of their root system and leaf surface to heavy metals (copper, zinc, nickel). It was confirmed that some spectral anomalies appear in the near-infrared range of 700–900 nm. The anomaly is formed in a short period of 1–2 days, when a leaf surface is contaminated and a little later — when a substrate is watered. The paper considers the phenomenon of spectral anomaly inversion for all metals. It gives positive and negative spectral anomalies of contaminated plants in comparison to control plants. We analyzed the mechanism of changes in spectral characteristics of plants under the influence of heavy metals in terms of their physiological state, vegetation phase and species. It is shown that the detected changes can be represented as a dose-effect curve expressed through Richards’ function. In accordance with the spectral characteristics of plants, we calculated some special indices of chlorophyll content, confirming our conclusions about metal solution influence on leaf pigments. The amplitude of the spectral anomalies and the duration of their existence indicate the possibility of their detection and mapping by aerospace videospectral systems of high spatial and spectral resolution before the appearance of visible morphological changes in plants.
Keywords: reflectance, spectral anomaly, videospectral survey, heavy metals
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