EGU21-1355
https://doi.org/10.5194/egusphere-egu21-1355
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Drivers of carbon emissions and active layer thickening from boreal wildfires in a continuous permafrost region of Northeast Siberia

Clement J.F. Delcourt1, Linar Akhmetzyanov2, Brian Izbicki3, Elena A. Kukavskaya4, Michelle C. Mack3, Trofim C. Maximov5, Roman E. Petrov5, Brendan M. Rogers6, Ute Sass-Klaassen2, Rebecca C. Scholten1, Tatiana A. Shestakova6, Dave van Wees1, and Sander Veraverbeke1
Clement J.F. Delcourt et al.
  • 1Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
  • 2Forest Ecology and Forest Management Group, Wageningen University & Research, Wageningen, The Netherlands
  • 3Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, United States of America
  • 4V.N. Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences - separate subdivision of FRC KSC SB RAS, Krasnoyarsk, Russia
  • 5Institute for Biological Problems of Cryolithozone, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
  • 6Woodwell Climate Research Center, Falmouth, MA, United States of America

The circumpolar boreal biome is affected by increases in fire frequency and severity associated with climate warming. About 30% of the world’s terrestrial carbon (C) is stored in the boreal region. Fires can produce large C emissions when substantial amounts of aboveground and belowground biomass and soil organic matter are combusted. Quantification and understanding of the drivers of C combustion is crucial to better assess the role of boreal fires in the global carbon cycle.

Despite the fact that the majority of boreal burned area occurs on the Eurasian continent, relatively few measurements of C combustion have been made in Eurasian boreal ecosystems. Here we synthetized data from 41 field sites collected during the summer of 2019 in Eastern Siberian larch forests. C combustion from surface and stand-replacing fires varied between 1.54 and 5.38 kg C/m2. Belowground pools contributed in average to 73.9% of total C combustion. C combustion was higher in open larch-dominated forests (Larix cajanderi) and open forests with a mixture of larch and pine (Pinus sylvestris). High severity crown fires were observed in dense larch-dominated forests, yet C combustion was in average 23% lower than in the open stands. To our knowledge, this study is the first to quantify C combustion from wildfires in a continuous permafrost terrain in Northeast Siberia. We also investigated the effects of fire weather and pre-fire stand characteristics (e.g., stand age, drainage conditions, overstory tree species composition) on C combustion.

Because fires can also have a longer-term impact on permafrost environments through changes in surface energy balance and ground thermal regime, we also quantified active layer deepening in our study area. We measured thaw depth in 13 burned and 6 unburned sites one year after the fire. We explored the interactions between fire, vegetation, drainage conditions, and thaw depth. Our study shows that fire deepens the active layer, yet the magnitude of the effect is controlled by vegetation characteristics and topo-edaphic factors. Our findings provide insight to feedbacks between climate warming and boreal fires in permafrost-underlain larch forests in Siberia.

How to cite: Delcourt, C. J. F., Akhmetzyanov, L., Izbicki, B., Kukavskaya, E. A., Mack, M. C., Maximov, T. C., Petrov, R. E., Rogers, B. M., Sass-Klaassen, U., Scholten, R. C., Shestakova, T. A., van Wees, D., and Veraverbeke, S.: Drivers of carbon emissions and active layer thickening from boreal wildfires in a continuous permafrost region of Northeast Siberia, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1355, https://doi.org/10.5194/egusphere-egu21-1355, 2021.

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