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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, 2019, Vol. 16, No. 5, pp. 194-202

Dynamics of NDVI for different classes of territorial units of typical tundra vegetation

K.V. Ivanova 1 
1 Komarov Botanical Institute RAS, Saint Petersburg, Russia
Accepted: 04.09.2019
DOI: 10.21046/2070-7401-2019-16-5-194-202
The vegetation cover of the tundra zone clearly reacts to variations in climatic conditions. This paper discusses, using satellite images, the seasonal dynamics of 2017–2018 vegetative index (Sentinel-2A) and interannual NDVI dynamics (Landsat 5, 8) in the initial vegetation period on the territory of the Vangureymusyur elevation (Bolshezemelskaya Tundra, Nenets Autonomous Okrug) which belongs to the subzone of typical tundra. The greatest differences between the indices of the index for different classes of territorial units of vegetation (TUV) can be traced from mid-June to mid-July. At the end of July and beginning of August, when the maximum values of the index are reached, these indicators are converging, and the peak of the growing season for all classes is at the end of July and the beginning of August. The maximum NDVI values are noted for the TUV classes of flat, poorly drained terraces and flowing depressions of the watersheds, the minimum for the river valleys department, and in the section of water sections for the class of near-lake depressions. A comparative analysis of the interannual NDVI indicators for the initial growing season showed a general tendency for the index values to decline over the past two decades, i.e., a decrease in the accumulation of aboveground green phytomass, while the differences between the TUV classes remain. The results obtained indicate a shift in the timing of the beginning of the growing season, which is confirmed by the work of a number of Russian and foreign researchers.
Keywords: vegetation, territorial units of vegetation, dynamics of NDVI, Arctic, East European tundra
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