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Knorre, Anastasia A.
Kirdyanov, Alexander V.
Prokushkin, Anatoly S.
Krusic, Paul J.
Büntgen, Ulf
2020-01-20T07:55:54Z
2020-01-20T07:55:54Z
2019-02
Knorre, Anastasia A. Tree ring-based reconstruction of the long-term influence of wildfires on permafrost active layer dynamics in Central Siberia [Текст] / Anastasia A. Knorre, Alexander V. Kirdyanov, Anatoly S. Prokushkin, Paul J. Krusic, Ulf Büntgen // Science of the Total Environment. — 2019. — Т. 652. — С. 314-319
00489697
https://doi.org/10.1016/j.scitotenv.2018.10.124
https://elib.sfu-kras.ru/handle/2311/129189
Although it has been recognized that rising temperatures and shifts in the hydrological cycle affect the depth of the seasonally thawing upper permafrost stratum, it remains unclear towhat extent thefrequency and intensity ofwildfires, and subsequent changes in vegetation cover, influence the soil active layer on different spatiotemporal scales. Here,we use ring widthmeasurements of the subterranean stem part of 15 larch trees from a Sphagnum bog site in Central Siberia to reconstruct long-term changes in the thickness of the active layer since the lastwildfire occurred in 1899. Our approach reveals a three-step feedback loop between above- and belowground ecosystem components. After all vegetation is burned, direct atmospheric heat penetration over the first ~20 years caused thawing of the upper permafrost stratum. The slow recovery of the insulating ground vegetation reverses the process and initiates a gradual decrease of the active layer thickness. Due to the continuous spreading and thickening of the peat layer during the last decades, the upper permafrost horizon has increased by 0.52 cm/year. This study demonstrates the strength of annually resolved and absolutely dated tree-ring series to reconstruct the effects of historical wildfires on the functioning and productivity of boreal forest ecosystems at multi-decadal to centennial time-scale. In so doing, we show how complex interactions of above- and belowground components translate into successive changes in the active permafrost stratum. Our results are particularly relevant for improving long-term estimates of the global carbon cycle that strongly depends on the source and sink behavior of the boreal forest zone.
Boreal forest
Ecological interaction
Ecosystem response
Seasonally thawing soil layer
Sphagnum
Larix gmelinii
Tree ring-based reconstruction of the long-term influence of wildfires on permafrost active layer dynamics in Central Siberia
Journal Article
Journal Article Preprint
314-319
34.35.15
2020-01-20T07:55:54Z
10.1016/j.scitotenv.2018.10.124
Институт экологии и географии
Лаборатория биогеохимии экосистем
Кафедра экологии и природопользования
Science of the Total Environment
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Q1


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