“…The world's boreal forest, and the transition zone from the boreal forest to the tundra zone to the north of it, has a high importance for biodiversity and in modulating the global carbon and water cycles Callaghan, Werkman & Crawford, 2002;Hofgaard, Harper & Golubeva, 2012;Rees et al, 2020). This importance is not matched by our current level of knowledge of this extensive zone, and the problem is particularly acute in Russia (Alekseev, Tomppo, McRoberts & von Gadow, 2019;Filipchuk, Moiseev, Malysheva & Strakhov, 2018). Roughly half of the Russian forests were last surveyed more than 25 years ago (Alekseev et al, 2019), while areas of tundra generally receive less attention than forest Northern high latitudes can be regarded as a "hotspot" of global warming through the phenomenon of "Arctic amplification" (Previdi, Janoski, Chiodo, Smith & Polvani, 2020), and vegetation is expected to respond directly to climate change (Diffenbaugh & Field, 2013) and indirectly through alterations in fire regimes and anthropogenic disturbance (Hofgaard et al, 2010).…”