Long-term ecological consequences of forest fires in the continuous permafrost zone of Siberia : научное издание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1088/1748-9326/ab7469

Ключевые слова: active soil layer; boreal forest; permafrost; Siberia; stable isotopes; tree rings; wildfire

Аннотация: Wildfires are an important factor in controlling forest ecosystem dynamics across the circumpolar boreal zone. An improved understanding of their direct and indirect, short- to long-term impacts on vegetation cover and permafrost-vegetation coupling is particularly important to predict changes in carbon, nutrient and water cycles under projected climate warming. Here, we apply dendrochronological techniques on a multi-parameter dataset to reconstruct the effect of wildfires on tree growth and seasonal permafrost thaw depth in Central Siberia. Based on annually-resolved and absolutely dated information from 19 Gmelin larch (Larix gmelinii (Rupr.) Rupr.) trees and active soil layer thickness measurements, we find substantial stand-level die-off, as well as the removal of ground vegetation and the organic layer following a major wildfire in 1896. Reduced stem growth coincides with increased delta C-13 in the cellulose of the surviving trees during the first decade after the wildfire, when stomatal conductance was reduced. The next six to seven decades are characterized by increased permafrost active soil layer thickness. During this period of post-wildfire ecosystem recovery, enhanced tree growth together with positive delta C-13 and negative delta O-18 trends are indicative of higher rates of photosynthesis and improved water supply. Afterwards, a thinner active soil layer leads to reduced growth because tree physiological processes become limited by summer temperature and water availability. Revealing long-term effects of forest fires on active soil layer thickness, ground vegetation composition and tree growth, this study demonstrates the importance of complex vegetation-permafrost interactions that modify the trajectory of post-fire forest recovery across much of the circumpolar boreal zone. To further quantify the influence of boreal wildfires on large-scale carbon cycle dynamics, future work should consider a wide range of tree species from different habitats in the high-northern latitudes.

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Издание

Журнал: ENVIRONMENTAL RESEARCH LETTERS

Выпуск журнала: vol. 15, Is. 3

ISSN журнала: 17489326

Место издания: BRISTOL

Издатель: IOP PUBLISHING LTD

Авторы

  • Kirdyanov Alexander V. (Univ Cambridge, Dept Geog, Cambridge CB2 3EN, England; RAS, VN Sukachev Inst Forest SB, Fed Res Ctr, Krasnoyarsk Sci Ctr SB, Akademgorodok 660036, Russia; Siberian Fed Univ, Svobodnii 79, Krasnoyarsk 660041, Russia)
  • Saurer Matthias (Swiss Fed Res Inst WSL, CH-8903 Birmensdorf, Switzerland)
  • Siegwolf Rolf (Swiss Fed Res Inst WSL, CH-8903 Birmensdorf, Switzerland)
  • Knorre Anastasia A. (Siberian Fed Univ, Svobodnii 79, Krasnoyarsk 660041, Russia; State Nat Reserve Stolby, Krasnoyarsk 660006, Russia)
  • Prokushkin Anatoly S. (RAS, VN Sukachev Inst Forest SB, Fed Res Ctr, Krasnoyarsk Sci Ctr SB, Akademgorodok 660036, Russia; Siberian Fed Univ, Svobodnii 79, Krasnoyarsk 660041, Russia)
  • Churakova Olga V. (Siberian Fed Univ, Svobodnii 79, Krasnoyarsk 660041, Russia; Swiss Fed Res Inst WSL, CH-8903 Birmensdorf, Switzerland)
  • Fonti Marina V. (Siberian Fed Univ, Svobodnii 79, Krasnoyarsk 660041, Russia; Swiss Fed Res Inst WSL, CH-8903 Birmensdorf, Switzerland)
  • Buentgen Ulf (Univ Cambridge, Dept Geog, Cambridge CB2 3EN, England; Masaryk Univ, Dept Geog, Fac Sci, Brno 61300, Czech Republic; Czech Acad Sci CzechGlobe, Global Change Res Inst, Brno 60300, Czech Republic)

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