Climate-related changes in the vegetation cover of the taiga and tundra of Western Siberia in 1982–2015 according to satellite observations

The paper considers the results of the trend and correlation analysis of air temperature and vegetative index NDVI for the warm period for the territory of taiga and tundra of Western Siberia in 19822015. It was revealed that with significant ( = 0.05) positive air temperature trends in some months of the spring-summer period, both for the taiga zone and for the tundra zone, a significant increase in NDVI is observed. The trends of air temperature and NDVI for the taiga and tundra zones from April to October 19822015 have been calculated and the unevenness of their spatial distribution over the territory under consideration is shown. It is revealed that the development of vegetation in the warm period is largely determined by its development in the first month of the warm period May for taiga and June for tundra. It is shown that the NDVI value in May in the taiga zone is formed under the influence of April-May temperatures, and in June in the tundra zone under the influence of June temperatures; significant NDVI correlation coefficients with the average temperature of April-May and May-June are characteristic of practically the entire territory of the region, with the exception of the coastal northern regions in the first case and the south-western regions in the second.