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Identification of early stages of damage to spruce stands by bark beetle-typographer based on combined analysis of Sentinel-2B satellite survey materials and ground surveys

https://doi.org/10.21266/2079-4304.2023.246.22-43

Abstract

The study is devoted to the identification of the early stages of damage to Norway spruce tree stands by a bark beetle. From a practical point of view, it is of crucial importance to identify the initial stage of bark beetle damage, in which colonized trees do not yet show distinct symptoms of damage, and the needles retain their green color. The objective of the paper was to study by methods of mathematical statistics changes in the vegetation indices NDVI and SWVI for Norway spruce stands, which in 3 years have gone from healthy to severely damaged. The objects of the study were 12 sites of mass reproduction of bark beetles and other stem pests formed in 2021 on the territory of Vyborg and Gatchina districts of the Leningrad region in mature Norway spruce tree stands. During the ground work, the survey and mapping of damaged sites were carried out. With the help of the EO Browser mapping service, Sentinel-2B satellite survey materials for June-September 2020 (no damage), 2021 (early stages of damage) and 2022 (late stages of damage) were received on the territory of the damaged sites. Vegetation indices NDVI and SWVI were calculated on the basis of the received remote sensing materials. With the help of variance analysis, a reliable and significant decrease in the values of both indices was established by the years of damage, as well as by years and months. It is noted that when bark beetles damage plantings, the seasonal dynamics of index values changes. Reliable linear trends of decreasing of both index values by year and month are revealed. Analysis of the sensitivity coefficients and synchronicity of changes in vegetation indices by year and month showed that the decrease in index values occurs independently of external (random) factors, as well as not synchronously relative to each other. In practical terms, the revealed patterns of changes in the vegetation indices NDVI and SWVI can serve as a signal about the initial stage of damage to plantings and the basis for conducting ground surveys with the aim of early detection of damage and timely prevention of their spread.

About the Authors

A. S. Alekseev
St.Petersburg State Forest Technical University
Russian Federation

ALEKSEEV Aleksandr S. – DSc (Geography), professor, head of the department of forest inventory, management and GIS

194021. Institute per. 5. St. Petersburg



D. M. Chernikhovskii
St.Petersburg State Forest Technical University
Russian Federation

CHERNIKHOVSKII Dmitry M. – DSc (Agriculture), professor

194021. Institute per. 5. St. Petersburg



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For citations:


Alekseev A.S., Chernikhovskii D.M. Identification of early stages of damage to spruce stands by bark beetle-typographer based on combined analysis of Sentinel-2B satellite survey materials and ground surveys. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(246):22-43. (In Russ.) https://doi.org/10.21266/2079-4304.2023.246.22-43

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ISSN 2079-4304 (Print)
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