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Tree ring-based reconstruction of the long-term influence of wildfires on permafrost active layer dynamics in Central Siberia
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SYSNO ASEP 0495858 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Tree ring-based reconstruction of the long-term influence of wildfires on permafrost active layer dynamics in Central Siberia Tvůrce(i) Knorre, A. A. (RU)
Kirdyanov, A. V. (RU)
Prokushkin, A. S. (RU)
Krusic, P. J. (SE)
Büntgen, Ulf (UEK-B) RID, ORCID, SAICelkový počet autorů 5 Zdroj.dok. Science of the Total Environment. - : Elsevier - ISSN 0048-9697
Roč. 652, FEB (2019), s. 314-319Poč.str. 6 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Boreal forest ; Ecological interaction ; Ecosystem response ; Larix gmelinii ; Seasonally thawing soil layer ; Sphagnum Vědní obor RIV EH - Ekologie - společenstva Obor OECD Ecology Výzkumná infrastruktura CzeCOS II - 90061 - Ústav výzkumu globální změny AV ČR, v. v. i. Způsob publikování Open access Institucionální podpora UEK-B - RVO:86652079 UT WOS 000454418500029 EID SCOPUS 85055181475 DOI 10.1016/j.scitotenv.2018.10.124 Anotace 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 to what extent the frequency and intensity of wildfires, and subsequent changes in vegetation cover, influence the soil active layer on different spatiotemporal scales. Here, we use ring width measurements 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 last wildfire 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. Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2020 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0048969718340051?via%3Dihub
Počet záznamů: 1