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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, 2025, V. 22, No. 3, pp. 182-192

Spectral features of landscape transformation as characteristics of thermal regimes of soils of Central Siberia cryolithozone

M.Yu. Syroezhko 1, 2 , E.I. Ponomarev 1, 2 , T.V. Ponomareva 1, 2 
1 Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia
2 Siberian Federal University, Krasnoyarsk, Russia
Accepted: 23.04.2025
DOI: 10.21046/2070-7401-2025-22-3-182-192
Using the Norilsk industrial region of Krasnoyarsk Krai as an example, the paper presents a review classification of cryolithozone landscapes based on Landsat-8, -9 archive materials for the summer period of 2016–2023. The ranges of spectral indices characterizing the degree of landscape transformation, as well as ground-based data on soil thawing in two sample plots in the study area, were analyzed according to a complex methodology. The maximum similarity method was used to classify the images of the studied landscapes, as well as standard methods for assessing the state of vegetation based on spectral indices NDVI (Normalized Difference Vegetation Index) and LST (Land Surface Temperature). The review classification permits identification of up to 11 distinct landscape states within the cryolithozone of the study area. Two most contrasting landscape states were recorded, which were distinguished by the degree of transformation of the vegetation cover and the degree of destruction of the heat-insulating organogenic soil horizon. In the study area, the proportion of territory with signs of transformation after technogenic and aerotechnogenic impact varied from 5 % in the background area to 77 % in the technogenically disturbed area. Areas with signs of transformation were characterized by abnormally low NDVI values, reaching no more than 54 % of the indicators of undisturbed landscapes and a variation in the LST indicator between –7.0 and 3.6 % relative to the background values. According to field measurements of the soil thawing boundary, a significant 1.5–2.0-fold difference was observed in the depth of thawing in background conditions and in a transformed state of the landscape. The variability of seasonal thawing of soils in the cryolithozone is in qualitative agreement with estimates of landscape transformation. Therefore, the classification of the survey data into tundra landscapes enables us to indirectly characterize the variations in the thermal regimes of soils within the cryolithozone of Siberia.
Keywords: Siberia, cryolithozone, spectral indices, NDVI, LST, soil, thawing depth
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