EGU21-11428
https://doi.org/10.5194/egusphere-egu21-11428
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

The role of fires for tundra-forest transition in northwest Siberia

Ekaterina Ezhova1, Oleg Sizov2, Petr Tsymbarovich3, Andrey Soromotin4, Nikolay Prihod'ko4, Tuukka Petäjä1, Sergey Zilitinkevich1, Markku Kulmala1, Jaana Bäck5, and Kajar Köster5
Ekaterina Ezhova et al.
  • 1INAR - Institute for atmospheric and Earth system research/Physics, University of Helsinki, Helsinki, Finland
  • 2Institute of Oil and Gas Problems, Russian Academy of Sciences, Moscow, Russia
  • 3Department of Physical Geography and Environmental Management Problems, Institute of Geography, Russian Academy of Sciences, Moscow, Russia
  • 4Research Institute of Ecology and Natural Resource Management, Tyumen State University, Tyumen, Russia
  • 5Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, University of Helsinki, Helsinki, Finland

Transition of arctic vegetation from tundra to shrubs and forest is an important process influencing global carbon budget. Transition is predicted due to warming and prolongation of the growing season but observations show that it is slower than expected. Fires are disturbances that could trigger a shift of biomes.

We studied the transition of dry tundra to forest and woodland in northwest Siberia for burned and background sites within the time interval of 60 years. We used meteorological data to estimate potential shifts in vegetation based on a bioclimatic model. To investigate fire and vegetation dynamics, we used historical and modern satellite imagery (Corona KH-4b, Landsat-5,7,8, Resurs-P, SPOT-6,7). We performed comparative analysis of vegetation using high-resolution satellite data from different years.

The growing season length increased by 20 days and the mean temperature of the growing season increased by 1°C making climatic conditions suitable for trees. We showed that ca 40% of the total study area experienced fires at least once during the last 60 years. Within this period, shift from dry tundra to tree-dominated vegetation occurred in 6-15% of the area in the non-disturbed sites compared to 40-85% of the area in the burned sites.

How to cite: Ezhova, E., Sizov, O., Tsymbarovich, P., Soromotin, A., Prihod'ko, N., Petäjä, T., Zilitinkevich, S., Kulmala, M., Bäck, J., and Köster, K.: The role of fires for tundra-forest transition in northwest Siberia, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11428, https://doi.org/10.5194/egusphere-egu21-11428, 2021.

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