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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, 2024, Vol. 21, No. 2, pp. 223-234

Optical thickness of vegetation taking into account the dielectric characteristics of water in living plants

A.N. Romanov 1 
1 Institute for Water and Environmental Problems SB RAS, Barnaul, Russia
Accepted: 03.04.2024
DOI: 10.21046/2070-7401-2024-21-2-223-234
The microwave emission of ground cover with ground vegetation depends on the dielectric characteristics of both the soil and the vegetation. With microwave remote sensing, the problem arises of isolating the contributions of vegetation and soil to the total radiation of the underlying surface. This work examines the possibility of taking into account the dielectric characteristics of water in living plants when remotely determining soil moisture in the case of incomplete shielding of soil microwave radiation by vegetation. For this purpose, the dependences of the dielectric characteristics of the elements of the above-ground parts (leaves, stems, ears) of wheat, oats, and rye on volumetric humidity were studied. The difference in dielectric characteristics of the lower (first, second) and upper (third-fifth) leaves, as well as ears of wheat at different periods of ripeness, was experimentally established. Differences in the dielectric characteristics of living and dead oat seedlings were revealed. The dependences of the refractive index and absorption on the volumetric humidity for cereals (wheat, rye, oats) have been established. Using a refractive model, the refractive index and absorption of water in plants were determined. Based on the measured dielectric parameters, the dependence of the optical depth of vegetation on the volume fraction of water in plants was calculated and the shielding effect of vegetation on the microwave radiation of the soil was assessed.
Keywords: vegetation, soil, temperature, humidity, refractive and absorption indices, optical thickness of vegetation, emissivity, microwave range
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