Long-term ecological consequences of forest fires in the continuous permafrost zone of Siberia
URI (для ссылок/цитирований):
https://iopscience.iop.org/article/10.1088/1748-9326/ab7469https://elib.sfu-kras.ru/handle/2311/142909
Автор:
Alexander, V Kirdyanov
Matthias, Saurer
Rolf, Siegwolf
Anastasia, A Knorre
Anatoly, S Prokushkin
Olga V Churakova (Sidorova)
Marina, V Fonti
Ulf, Büntgen
Коллективный автор:
Институт экологии и географии
Лаборатория биогеохимии экосистем
Лаборатория комплексных исследований динамики лесов Евразии
Дата:
2020Журнал:
Environmental Research LettersКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q1Библиографическое описание:
Alexander, V Kirdyanov. Long-term ecological consequences of forest fires in the continuous permafrost zone of Siberia [Текст] / V Kirdyanov Alexander, Saurer Matthias, Siegwolf Rolf, A Knorre Anastasia, S Prokushkin Anatoly, Olga V Churakova (Sidorova), V Fonti Marina, Büntgen Ulf // Environmental Research Letters. — 2020. — Т. 15 (№ 3).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 δ13Cin 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 δ13C and negative δ18O 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.