Home – Home – Jornals – Geography and Natural Resources 2022 number 1

A comparative analysis is made of the remote spectral indices in investigating changes in vegetation cover in post-agrogenic biogeocenoses of the Bolshezemel’skaya tundra. In agricultural use, meadow biogeocenoses, compared with the surrounding background areas, were characterized by relatively high indices characterizing the moisture and photosynthetic activity of plant phytomass (NDVI, LWCI, NDMI, and B5). To assess the changes in the amount of dead biomass, the PSRI index was used, the values of which were minimal during the period of agricultural use of meadows during their regular mowing. During self-healing succession in post-agrogenic biogeocenoses, the values of spectral indices gradually approach those of the background sections. In the post-agrogenic period, the values of the LWCI, NDMI and NDVI indices gradually decreased in meadow biogeocenoses, and the PSRI and spectral channel B3 values increased. The dynamics of the spectral indices is affected by the changes in the species composition. In the post-agrogenic period in meadow biogeocenoses, seeded cereal grass stand is thinned out, a shrub layer is formed, and species introduced from surrounding communities become dominant and subdominant. The activation of the self-healing succession of tundra vegetation in post-agrogenic biogeocenoses takes place against the backdrop of climate warming. Statistical relationships are determined, which reflect the influence of climatic parameters on changes in spectral indices in post-agrogenic and background biogeocenoses. A decrease in the severity of the climate is accompanied by an increase in the values of spectral indices characterizing the vegetative activity of tundra vegetation. An increase in the amount of precipitation contributes to an increase in the values of the indices reflecting the supply of plants with moisture.