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. 149-160

Estimation of drying out of dark coniferous forests caused by the spread of the four-eyed fir bark beetle in Perm Krai based on satellite and field observations

L.A. Ivanchina 1 , L.A. Shilonosov 1 , A.N. Shikhov 1 
1 Perm State University, Perm, Russia
Accepted: 19.03.2025
DOI: 10.21046/2070-7401-2025-22-3-149-160
The signs of drying out of dark coniferous plantations in the central part of Perm Krai caused by the spread of the four-eyed fir bark beetle are considered using Sentinel-2 satellite images of the MSI (Multispectral Instrument) sensor. Field surveys were carried out on 51 test areas within which the proportion of living, dead, windbreak and windfall dark coniferous trees, as well as some taxation characteristics, were determined. Twenty eight vegetation indices and spectral brightness coefficients (SBC) in separate bands were calculated using Sentinel-2 satellite images obtained in June and July 2024. The correlation coefficients between the indicators of sanitary condition of the plantations and vegetation indices and SBC from the Sentinel-2 images were calculated. Statistically significant correlations with indicators of sanitary condition were revealed for a number of indices, but for both images the significance was confirmed only for the correlation between the proportion of living trees and the values of the leaf water indices (LWI) and normalized difference moisture indices (NDMI). The informative value of these indices was previously demonstrated using Landsat images as an example. The values of the indices in the studied areas are approximately equally determined by both the proportion of living or dead dark coniferous trees and the taxation indicators, primarily the proportion of dark coniferous species, the completeness of planting, the proportion of windbreak and windfall. In order to clarify the dependencies between vegetation indices and sanitary condition indicators of forest stand, the selection of sample areas should include more homogeneous stands according to taxation indicators.
Keywords: dark coniferous forests, drying out, four-eyed fir bark beetle, Sentinel-2 images, spectral brightness coefficient, vegetation indices, correlation
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