Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 6, pp. 165-173
Zonal heterogeneity of vegetation response during active vegetative season to variability of spring meteorological regime over East European Plain
L.M. Kitaev
1 , T.B. Titkova
1 1 Institute of Geography RAS, Moscow, Russia
Accepted: 13.12.2021
DOI: 10.21046/2070-7401-2021-18-6-165-173
An assessment of the response of vegetation during the early growing season (April – June) to the variability of the pre-spring and spring meteorological regime was carried out. The analysis was realized using the MOD13A2 (v. 6) product, where NDVI values are contained as an equivalent to the amount of phytomass (MODIS/Terra data), as well as using the results of meteorological stations of Roshydromet observations. For the East European Plain, the period of active vegetation is considered (April – July) to take into account the vegetation activity of cold-resistant plant species and the possible effect of snow cover on the vegetation. The zonal regularities of spatial relationship of NDVI variability with air temperature, total precipitation and maximal snow storage have been obtained. The maximal NDVI values are typical of the center of the region (mixed and deciduous forests) with average air temperatures for the territory and significant total precipitation and maximal snow reserves. Based on the analysis of regression equations, zonal differences in the ratios of the long-term NDVI variation and each meteorological characteristic were estimated: a significant increase in NDVI with an increase in surface air temperature occurs in the tundra, and with an increase in total precipitation and snow reserves in the forest-steppe and in the steppe. The greatest significance for the long-term NDVI variability during the active growing season everywhere have changes in the surface air temperature, then total precipitation, and snow reserves, but only for the tundra, forest-steppe and steppe.
Keywords: vegetation index NDVI, surface air temperature, total precipitation, active vegetation period, regression relationships, long-term trends, spatial variability, East European Plain
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