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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, Vol. 22, No. 1, pp. 106-115

The features of post-fire dynamics of spectral characteristics of larch stands in the permafrost zone of Siberia

N.D. Yakimov 1, 2 , E.I. Ponomarev 3, 1, 2 , A.N. Zabrodin 1, 2 , T.V. Pnomareva 3, 2 
1 Krasnoyarsk Science Center SB RAS, Krasnoyarsk, Russia
2 Siberian Federal University, Krasnoyarsk, Russia
3 Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia
Accepted: 03.12.2024
DOI: 10.21046/2070-7401-2025-22-1-106-115
The paper discusses the post-fire dynamics of spectral characteristics of Siberian vegetation growing in permafrost conditions which are divided into four variants according to the degree of closure. The study was conducted based on the analysis of data obtained from Landsat satellites for a series of fires (2016–2018) in an area dominated by larch stands, with reference to permafrost variants. The work presents data on the variability of the Normalized Difference Vegetation Index (NDVI) values and Land Surface Temperature (LST) spectral indices in post-fire successions, taking into account the initial level of fire exposure according to the Differenced Normalized Burn Ratio (dNBR) index. Based on spectral characteristics, the highest level of initial fire exposure was observed in territories situated within the continuous permafrost zone. For a sample of fires, levels of fire exposure and the dynamics of spectral features were classified over a 5-year period. Post-fire abnormal values of ΔNDVI were no higher than ~28 % of the background level in conditions of continuous permafrost, 57 % in discontinuous permafrost, >69 % in sporadic permafrost, and ~50 % in areas with isolated patches of permafrost. The maximum level of thermal anomalies according to ΔLST recorded right after fire exposure decreased across the continuous – discontinuous – sporadic – isolated patches permafrost variants ~85 to ~75, 68, and 64 %, respectively. Characteristic scenarios of the ΔNDVI and ΔLST dynamics during the 5-year post-fire recovery were identified, which were different for the zone of continuous permafrost and forest-growing areas in conditions of discontinuous and sporadic permafrost. The average accuracy of the approximation ranged from 0.35 to 0.63, with a significance level of 95 %. The differences in the dynamic curves of the ΔNDVI and ΔLST anomalies recorded in this study are consistent with the characteristic features of post-fire successions described in the literature for larch forests with a predominance of Gmelin larch (continuous permafrost zone) and Siberian larch mixed with dark coniferous species (territories of discontinuous permafrost).
Keywords: cryolithozone, Siberia, larch forests, NDVI, LST, dNBR
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