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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. 3, pp. 155-170

Assessment of informativeness of temperature-vegetation index as an indicator of moisture content of tundra ground vegetation cover

S.G. Kornienko 1 , V.V. Elsakov 2 
1 Oil and Gas Research Institute RAS, Moscow, Russia
2 Institute of Biology, Komi Science Centre UrB RAS, Syktyvkar, Russia
Accepted: 15.05.2024
DOI: 10.21046/2070-7401-2024-21-3-155-170
The relevance of developing methods for studying the moisture content of ground vegetation cover (GVC) in tundra zones of the Arctic and Subarctic is due to the need to assess the state of cryogenic landscapes under anthropogenic impact and the observed trend of climate warming. This work aims to assess the informativeness of the temperature-vegetation index WI (Wet Index) as an indicator of humidity of different types of GVCs in the tundra zone of the Yamal Peninsula. The study was conducted on the example of a large area using multi-scale vegetation maps, geomorphologic maps, and WI distributions calculated from Landsat satellite data of 1988, 1989, 2013, and 2020. The index was calculated using the trapezoidal method based on diagrams characterizing the relationship between surface temperature LST (Land Surface Temperature) and vegetation index NDVI (Normalized Difference Vegetation Index). The results of comparing WI moisture index distributions with a large-scale (M 1:10,000) landscape map of the test site showed a stable relationship between the degree of surface drainage of different tract types and changes in average WI index values. For phytocenoses and areas of open sands, there is a marked decrease in the WI index with increasing geomorphologic levels from laida to IV plain, which also indicates the informativeness of the WI index as an indicator of GVC moisture content. The eight classes of phytocenoses represented on the medium-scale vegetation map (M 1:100,000) are divided into seven-eight stages according to the WI index at almost all geomorphologic levels, including floodplain, I-II terraces, III-terrace, and IV plain. The results indicate a relatively high informativeness of the WI index for studying, mapping and systematizing different types of phytocenoses of tundra zones by moisture content as the main parameter characterizing their thermophysical and thermal insulation properties.
Keywords: humidity, geomorphological levels, phytocenoses, systematization, Landsat satellites, temperature-vegetation index, tundra
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