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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, 2022, Vol. 19, No. 3, pp. 178-185

Dark conifer forests NDVI as a function of climate in the Volga basin

P.A. Shary 1 , L.S. Sharaya 2 
1 Institute of Physicochemical and Biological Problems in Soil Science RAS, Pushchino, Moscow Region, Russia
2 Institute of Ecology of the Volga Basin RAS, Togliatti, Russia
Accepted: 26.05.2022
DOI: 10.21046/2070-7401-2022-19-3-178-185
Vegetation index NDVI of dark-conifer forests for summer of 2005 is statistically compared with climate in the Volga basin. We separate two portions of the region that are represented by two samples each of 200 points (plots 1 km2): north-eastern (NE) and western (W) ones. Average winter temperature in W is 3.5 degrees greater than in NE. Two models of multiple regression are constructed that link NDVI with climate: for NE and for W. The relation of NDVI to winter or February temperature is positive in NE, but negative in W. The link of NDVI with precipitation in the cold period (November-March) is negative in NE and positive in W. We suggest that such non-linear behavior of dark-conifer forest NDVI for the whole region may be explained by both frost damages and known effects of winter drought. This was additionally strengthened by the influence of precipitation. Winter drought consists in that, at the end of winter, when roots are still frozen increasing transpiration results in water loss of branches and this leads to diminished NDVI later in summer.
Keywords: dark conifer forests, climate, winter drought, multiple regression
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