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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. 1, pp. 210-219

Light conifer forest NDVI as a function of climate in the Volga basin

P.A. Shary 1, 2 , O.V. Pikulenko 2 , L.S. Sharaya 3 , V.I. Stepanova 2 
1 Institute of Physicochemical and Biological Problems in Soil Science RAS, Pushchino, Moscow Region, Russia
2 Institute of Biological Instrumentation RAS, Pushchino, Moscow Region, Russia
3 All-Russian Research Institute of Agrochemistry named after D.N. Pryanishnikova, Moscow, Russia
Accepted: 23.01.2024
DOI: 10.21046/2070-7401-2024-21-1-210-219
The vegetation index NDVI (Normalized Difference Vegetation Index) of light coniferous forests is statistically compared with the climate characteristics in the Volga basin. The NDVI of these forests depends non-monotonically on temperature and precipitation which allows identifying two areas for which the signs of the relationships between NDVI and climate are opposite. Changes in the nature of connections from positive to negative in light coniferous forests in the basin occur at a winter temperature of –13 °C. For this reason, two samples of 200 points (areas of 1 km2) each were identified in the study area, which correspond to these two parts with different signs of connections: northeastern and western. The relationship between NDVI of light coniferous forests and winter temperature is positive in the first, and negative in the second. For the northeastern sample, winter temperatures are 3.7 °C lower than in the western sample, and the amount of annual precipitation is 40 mm higher. In accordance with this, the average NDVI value of light coniferous forests for the northeastern region is 0.732, for the western region — 0.760. Two multiple regression models were constructed for the northeastern and western regions, linking NDVI with climate. The most influential factor for the regions is the distance to the northeast, with an increase in which the average winter temperature decreases by 7.5 °C, and the amount of annual precipitation increases. Accordingly, for the western part the relationship between NDVI and the distance to the northeast is positive, for the northeastern part it is negative. The NDVI of forests in the northeastern part is characterized by closer relationships with cold-season precipitation. When comparing the western and northeastern parts of the Volga River basin, an increase in the influence of climate on the NDVI of light coniferous forests in the colder and more humid northeastern part of the region was revealed.
Keywords: Volga basin, light conifer forests, climate, multiple regression
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